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Wide area network

A wide area network (WAN) is a telecommunications network that extends over a large geographic area. Wide area networks are often established with leased telecommunication circuits.

Businesses, as well as schools and government entities, use wide area networks to relay data to staff, students, clients, buyers and suppliers from various locations around the world. In essence, this mode of telecommunication allows a business to effectively carry out its daily function regardless of location. The Internet may be considered a WAN. Many WANs are, however, built for one particular organization and are private. WANs can be separated from local area networks (LANs) in that the latter refers to physically proximal networks.

Design options
The textbook definition of a WAN is a computer network spanning regions, countries, or even the world. However, in terms of the application of communication protocols and concepts, it may be best to view WANs as computer networking technologies used to transmit data over long distances, and between different networks. This distinction stems from the fact that common local area network (LAN) technologies operating at lower layers of the OSI model (such as the forms of Ethernet or Wi-Fi) are often designed for physically proximal networks, and thus cannot transmit data over tens, hundreds, or even thousands of miles or kilometres.

WANs are used to connect LANs and other types of networks together so that users and computers in one location can communicate with users and computers in other locations. Many WANs are built for one particular organization and are private. Others, built by Internet service providers, provide connections from an organization's LAN to the Internet.

WANs are often built using leased lines. At each end of the leased line, a router connects the LAN on one side with a second router within the LAN on the other. Because leased lines can be very expensive, instead of using leased lines, WANs can also be built using less costly circuit switching or packet switching methods. Network protocols including TCP/IP deliver transport and addressing functions. Protocols including Packet over SONET/SDH, Multiprotocol Label Switching (MPLS), Asynchronous Transfer Mode (ATM) and Frame Relay are often used by service providers to deliver the links that are used in WANs. It is also possible to build a WAN with Ethernet.

Academic research into wide area networks can be broken down into three areas: mathematical models, network emulation, and network simulation.

Performance improvements are sometimes delivered via wide area file services or WAN optimization.

Private networks
Of the approximately four billion addresses defined in IPv4, about 18 million addresses in three ranges are reserved for use in private networks. Packets addressed in these ranges are not routable on the public Internet; they are ignored by all public routers. Therefore, private hosts cannot directly communicate with public networks, but require network address translation at a routing gateway for this purpose.
 * {| class="wikitable"

!Name!!CIDR block!!Address range!!Number of addresses!!Obsolete classful description
 * + Reserved private IPv4 network ranges
 * 24-bit block||10.0.0.0/8||10.0.0.0 – 10.255.255.255||align="right"|$16,777,216$||Single Class A.
 * 20-bit block|||172.16.0.0/12||172.16.0.0 – 172.31.255.255||align="right"|$1,048,576$||Contiguous range of 16 Class B blocks.
 * 16-bit block||192.168.0.0/16||192.168.0.0 – 192.168.255.255||align="right"|$65,536$||Contiguous range of 256 Class C blocks.
 * }
 * 16-bit block||192.168.0.0/16||192.168.0.0 – 192.168.255.255||align="right"|$110 bit/s$||Contiguous range of 256 Class C blocks.
 * }
 * }

Since two private networks, e.g., two branch offices, cannot directly communicate via the public Internet, the two networks must be bridged across the Internet via a virtual private network (VPN) or other form of IP tunnel that encapsulates packets, including their headers containing the private addresses, for transmission across the public network. Additionally, encapsulated packets may be encrypted to secure their data.

Connection technology
Many technologies are available for wide area network links. Examples include circuit-switched telephone lines, radio wave transmission, and optical fiber. New developments have successively increased transmission rates. In c. 1960, a ⇭⇭⇭ line was normal on the edge of the WAN, while core links of 56 or 64 kbit/s were considered fast. Today, households are connected to the Internet with dial-up, asymmetric digital subscriber line (ADSL), cable, WiMAX, cellular network or fiber. The speeds that people can currently use range from 28.8 kbit/s through a 28K modem over a telephone connection to speeds as high as 100 Gbit/s using 100 Gigabit Ethernet.

The following communication and networking technologies have been used to implement WANs.

 * Asynchronous Transfer Mode
 * Cable modem
 * Cellular networks
 * Dial-up internet
 * Digital subscriber line
 * Fiber-optic communication
 * Frame Relay
 * ISDN
 * Leased line
 * SD-WAN
 * Synchronous optical networking
 * Very small aperture terminal (VSAT)
 * Wi-Fi
 * WiMAX
 * X.25

AT&T conducted trials in 2017 for business use of 400-gigabit Ethernet. Researchers Robert Maher, Alex Alvarado, Domaniç Lavery, and Polina Bayvel of University College London were able to increase networking speeds to 1.125 terabits per second. Christos Santis, graduate student Scott Steger, Amnon Yariv, Martin and Eileen Summerfield developed a new laser that potentially quadruples transfer speeds with fiber optics.

title: Wide area network


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Milford H. Wolpoff

Milford Howell Wolpoff is a paleoanthropologist and professor of anthropology at the University of Michigan and its museum of Anthropology. He is the leading proponent of the multiregional evolution hypothesis that explains the evolution of Homo sapiens as a consequence of evolutionary processes and gene flow across continents within a single species. Wolpoff authored the widely used textbook Paleoanthropology (1980 and 1999 eds.), and co-authored Race and Human Evolution: A Fatal Attraction, which reviews the scientific evidence and conflicting theories about the interpretation of human evolution, and biological anthropology's relationship to views about race.

Wolpoff is best known for his vocal support of the multiregional model of human evolution when it was challenged by the 'Out of Africa' theory. The basis for advancing the multiregional interpretation stems from his skepticism of punctuated equilibrium (the idea evolution typically proceeds with long static periods and abrupt changes, instead of gradual modification during speciation) as an accurate model for Pleistocene humanity, noting that speciation played a role earlier in human evolution.

Education
Wolpoff was born in 1942 to Ruth (Silver) and Ben Wolpoff, in Chicago. He received an A.B. in 1964 with a major in anthropology and a minor in mathematics, and a PhD in 1969 in physical anthropology, with minors in zoology and archaeology, from the University of Illinois in Urbana, Illinois. His research advisor and intellectual mentor was Eugene Giles. He joined the faculty of the University of Michigan in 1971, and became a professor of anthropology in 1977.

Professional work
Wolpoff was trained primarily as a paleoanthropologist at the University of Illinois under Eugene Giles. With his multidisciplinary training, he brings to the study of the human and non-human primate fossil record a background that combines evolutionary theory, population genetics, and biomechanics. With over 50 grants funded by the National Science Foundation, National Academy of Sciences, and the University of Michigan, Wolpoff has visited the museums where human and primate fossils are stored and has studied in detail and at length all the materials addressing the fossil evidence for human evolution across Europe, Asia, and Africa. His research foci have included the evolution and fate of the European Neandertals, the role of culture in early hominid evolution, the nature and explanation of allometry, robust australopithecine evolution, the distribution and explanation of sexual dimorphism, hominid origins, the pattern and explanation of Australasian hominid evolution, the contributions and role of genetics in paleoanthropological research, and the taxonomy of the genus Homo. In addition, he is a primary describer of many hominid fossil remains. Since 1976 Wolpoff has graduated more than 20 PhD students.

Multiregional evolution and the punctuated equilibrium theory
Drawing on this background and research experience, Wolpoff's continuing research in the last 15 years has been the development, articulation, and defense of his multiregional model of human evolution. He suggests that after an African origin of the Homo lineage (including Homo ergaster/Homo erectus) and the subsequent migration of H. erectus throughout much of the globe (Africa, Europe, Asia), local evolutionary events took place, and when they were advantageous, they spread everywhere else. According to Wolpoff, populations of Homo evolved together as a single species. Change in Pleistocene populations did not involve speciation (the splitting of one species into two): all this time, the geographically distinct populations maintained small amounts of gene flow. This idea directly challenges the Out of Africa model, which claims Homo sapiens evolved recently as a new species in Africa, and then dispersed throughout the Old World, replacing the existing human populations without mixing with them.

His theory evoked rivalry with the proponents of punctuated equilibrium, Stephen Jay Gould and Niles Eldredge, who endorsed H. erectus as a model of their theory. In an earlier example of punctuated evolution preceding the global diffusion of Homo sapiens genes from Africa, some two million years ago, Wolpoff points to evidence of an earlier 'genetic revolution' that took place in a small group isolated from australopithecine forebears. "The earliest H. sapiens remains differ significantly from australopithecines in both size and anatomical details," he notes, "Insofar as we can tell, these changes were sudden and not gradual."

Awards and honours
Wolpoff is a member of many anthropological organizations, and is an Honorary Life Member of the Honor Society of Phi Kappa Phi, a Fellow of the American Association for the Advancement of Science (in 2001) and Fellow of the American Anthropological Association. Some notable awards are
 * LS&A Excellence in Education Award in 1998
 * W.W. Howells Book Prize in Biological Anthropology, presented by the Biological Anthropology Section of the American Anthropological Association in 1999
 * Dragutin Gorjanović-Kramberger Award at the Krapina 1899–1999 Conference, presented by the Croatian Natural History Museum
 * Sigma Xi Distinguished Lecturer of 2001–2004
 * Darwin Lifetime Achievement Award from the American Association of Physical Anthropologists in 2011

Books and monographs

 * 1971 Metric Trends in Hominid Dental Evolution.  Case Western Reserve Studies in Anthropology 2.  Case Western Reserve University Press, Cleveland;  244 pp.
 * 1976 William R. Farrand, Richard W. Redding, Milford H. Wolpoff, and Henry T. Wright, III). An Archaeological Investigation on the Loboi Plain, Baringo District, Kenya. Museum of Anthropology, The University of Michigan Technical Reports Number 4, Research Reports in Archaeology, Contribution 1, Ann Arbor.
 * 1980 Paleoanthropology. Knopf, New York; 379 pp.  ISBN 0-394-32197-9
 * 1988 Jakov Radovčić, Fred H. Smith, Erik Trinkaus, and Milford H. Wolpoff . The Krapina Hominids: An Illustrated Catalog of the Skeletal Collection. Mladost Press and the Croatian Natural History Museum, Zagreb.
 * 1994 Paleoanthropology.  Preliminary publication of the 2nd edition. College Custom Series, McGraw-Hill, New York.  ISBN 0-07-071679-X
 * 1995 Human Evolution.  1996 edition. College Custom Series, McGraw-Hill, New York.  ISBN 0-07-071827-X
 * 1996 Human Evolution.  1996-1997 edition. College Custom Series, McGraw-Hill, New York.  ISBN 0-07-071833-4
 * 1997 Milford H. Wolpoff and Rachel Caspari: Race and Human Evolution.  Simon and Schuster, New York. ISBN 0-684-81013-1.  Published in paperback in 1998 by Westview press ISBN 0-8133-3546-9.  A Canadian National Institute for the Blind talking book RC18623 (4 cassettes, narrated by Roy Avers).
 * 1999	Paleoanthropology. 2nd edition. McGraw-Hill, New York. ISBN 0-07-071676-5.  Reviewed by A. Bilsborough (2001) Clash of the Titans.  Journal of Human Evolution 41:701-709.

His work with Rachel Caspari, Race and Human Evolution earned them the W.W. Howells Book Prize in 1999. Besides these, he has published 5 other books, 160 papers, and 22 book reviews, has presented numerous lectures and meetings papers, and has had many interviews and video appearances.

Magazines and films
Wolpoff has also appeared in The New York Times, New Scientist, Discover, and Newsweek. He has appeared in numerous video documentaries, notable ones include
 * Origins (SABC) in 1990
 * Beyond 2000 (Video Australia), The Roots of Humanity (NHK) and The Dawn of Humankind (PBS) in 1992
 * Apeman (4 part series produced by Granada TV), Dead Men Talk (Equinox), Wir Neandertaler (ORF) and Paleoworld: Missing Links (New Dominion in 1994)
 * Paleoworld: Trail of the Neanderthal (TLC) in 1995
 * Ancient Mysteries: The Fate of the Neandertals (A&E),  The Last Neandertal (Discovery) and Bipedalism and Human Evolution (TCJ) in 1997
 * Neanderthals on Trial (Nova) and Creationism and Evolution (PBS) in 2002
 * The Lapedo Child (Anglica Television) in 2003

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/

title: Milford H. Wolpoff


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Los Alamos National Laboratory

Los Alamos National Laboratory (often shortened as Los Alamos and LANL) is one of the sixteen research and development laboratories of the United States Department of Energy (DOE), located a short distance northwest of Santa Fe, New Mexico, in the American southwest. Best known for its central role in helping develop the first atomic bomb, LANL is one of the world's largest and most advanced scientific institutions.

Los Alamos was established in 1943 as Project Y, a top-secret site for designing nuclear weapons under the Manhattan Project during World War II. Chosen for its remote yet relatively accessible location, it served as the main hub for conducting and coordinating nuclear research, bringing together some of the world's most famous scientists, among them numerous Nobel Prize winners. The town of Los Alamos, directly north of the lab, grew extensively through this period.

After the war ended in 1945, Project Y's existence was made public, and it became known universally as Los Alamos. In 1952, the Atomic Energy Commission formed a second design lab under the direction of the University of California, Berkeley, which became the Lawrence Livermore National Laboratory (LLNL). The two labs competed on a wide variety of bomb designs, but with the end of the Cold War, have focused increasingly on civilian missions. Today, Los Alamos conducts multidisciplinary research in fields such as national security, space exploration, nuclear fusion, renewable energy, medicine, nanotechnology, and supercomputing.

While owned by the federal government, LANL is privately managed and operated by Triad National Security, LLC.

The Manhattan Project
The laboratory was founded during World War II as a secret, centralized facility to coordinate the scientific research of the Manhattan Project, the Allied project to develop the first nuclear weapons. In September 1942, the difficulties encountered in conducting preliminary studies on nuclear weapons at universities scattered across the country indicated the need for a laboratory dedicated solely to that purpose.

General Leslie Groves wanted a central laboratory at an isolated location for safety, and to keep the scientists away from the populace. It should be at least 200 miles from international boundaries and west of the Mississippi. Major John Dudley suggested Oak City, Utah, or Jemez Springs, New Mexico, but both were rejected. Jemez Springs was only a short distance from the current site. Project Y director J. Robert Oppenheimer had spent much time in his youth in the New Mexico area and suggested the Los Alamos Ranch School on the mesa. Dudley had rejected the school as not meeting Groves' criteria, but as soon as Groves saw it he said in effect "This is the place". Oppenheimer became the laboratory's first director; from 19 October 1942.

During the Manhattan Project, Los Alamos hosted thousands of employees, including many Nobel Prize-winning scientists. The location was a total secret. Its only mailing address was a post office box, number 1663, in Santa Fe, New Mexico. Eventually two other post office boxes were used, 180 and 1539, also in Santa Fe. Though its contract with the University of California was initially intended to be temporary, the relationship was maintained long after the war. Until the atomic bombings of Hiroshima and Nagasaki, Japan, University of California president Robert Sproul did not know what the purpose of the laboratory was and thought it might be producing a "death ray". The only member of the UC administration who knew its true purpose—indeed, the only one who knew its exact physical location—was the Secretary-Treasurer Robert Underhill, who was in charge of wartime contracts and liabilities.

The work of the laboratory culminated in several atomic devices, one of which was used in the first nuclear test near Alamogordo, New Mexico, codenamed "Trinity", on July 16, 1945. The other two were weapons, "Little Boy" and "Fat Man", which were used in the attacks on Hiroshima and Nagasaki. The Laboratory received the Army-Navy "E" Award for Excellence in production on October 16, 1945.

Post-war
After the war, Oppenheimer retired from the directorship, and it was taken over by Norris Bradbury, whose initial mission was to make the previously hand-assembled atomic bombs "G.I. proof" so that they could be mass-produced and used without the assistance of highly trained scientists. Other founding members of Los Alamos left the laboratory and became outspoken opponents to the further development of nuclear weapons.

The name officially changed to the Los Alamos Scientific Laboratory (LASL) on January 1, 1947. By this time, Argonne had already been made the first National Laboratory the previous year. Los Alamos would not become a National Laboratory in name until 1981.

In the years since the 1940s, Los Alamos was responsible for the development of the hydrogen bomb, and many other variants of nuclear weapons. In 1952, Lawrence Livermore National Laboratory was founded to act as Los Alamos' "competitor", with the hope that two laboratories for the design of nuclear weapons would spur innovation. Los Alamos and Livermore served as the primary classified laboratories in the U.S. national laboratory system, designing all the country's nuclear arsenal. Additional work included basic scientific research, particle accelerator development, health physics, and fusion power research as part of Project Sherwood. Many nuclear tests were undertaken in the Marshall Islands and at the Nevada Test Site. During the late-1950s, a number of scientists including Dr. J. Robert "Bob" Beyster left Los Alamos to work for General Atomics (GA) in San Diego.

Three major nuclear-related accidents have occurred at LANL. Criticality accidents occurred in August 1945 and May 1946, and a third accident occurred during an annual physical inventory in December 1958.

Several buildings associated with the Manhattan Project at Los Alamos were declared a National Historic Landmark in 1965.

Post-Cold War
At the end of the Cold War, both labs went through a process of intense scientific diversification in their research programs to adapt to the changing political conditions that no longer required as much research towards developing new nuclear weapons and has led the lab to increase research for "non-war" science and technology. Los Alamos' nuclear work is currently thought to relate primarily to computer simulations and stockpile stewardship. The development of the Dual-Axis Radiographic Hydrodynamic Test Facility will allow complex simulations of nuclear tests to take place without full explosive yields.

The laboratory contributed to the early development of the flow cytometry technology. In the 1950s, researcher Mack Fulwyler developed a technique for sorting erythrocytes that combined the Coulter Principle of Coulter counter technologies, which measures the presence of cells and their size, with ink jet technology, which produces a laminar flow of liquid that breaks up into separate, fine drops. In 1969, Los Alamos reported the first fluorescence detector apparatus, which accurately measured the number and size of ovarian cells and blood cells.

As of 2017, other research performed at the lab included developing cheaper, cleaner biofuels and advancing scientific understanding around renewable energy.

Non-nuclear national security and defense development is also a priority at the lab. This includes preventing outbreaks of deadly diseases by improving detection tools and the monitoring the effectiveness of the United States' vaccine distribution infrastructure. Additional advancements include the ASPECT airplane that can detect bio threats from the sky.

Medical work
In 2008, development for a safer, more comfortable and accurate test for breast cancer was ongoing by scientists Lianjie Huang and Kenneth M. Hanson and collaborators. The new technique, called ultrasound-computed tomography (ultrasound CT), uses sound waves to accurately detect small tumors that traditional mammography cannot.

The lab has made intense efforts for humanitarian causes through its scientific research in medicine. In 2010, three vaccines for the Human Immunodeficiency Virus were being tested by lab scientist Bette Korber and her team. "These vaccines might finally deal a lethal blow to the AIDS virus", says Chang-Shung Tung, leader of the Lab's Theoretical Biology and Biophysics group.

Negative publicity
The laboratory has attracted negative publicity from a number of events. In 1999, Los Alamos scientist Wen Ho Lee was accused of 59 counts of mishandling classified information by downloading nuclear secrets—"weapons codes" used for computer simulations of nuclear weapons tests—to data tapes and removing them from the lab. After ten months in jail, Lee pleaded guilty to a single count and the other 58 were dismissed with an apology from U.S. District Judge James Parker for his incarceration. Lee had been suspected for having shared U.S. nuclear secrets with China, but investigators were never able to establish what Lee did with the downloaded data. In 2000, two computer hard drives containing classified data were announced to have gone missing from a secure area within the laboratory, but were later found behind a photocopier.

Science mission
Los Alamos National Laboratory's mission is to "solve national security challenges through simultaneous excellence". The laboratory's strategic plan reflects U.S. priorities spanning nuclear security, intelligence, defense, emergency response, nonproliferation, counterterrorism, energy security, emerging threats, and environmental management. This strategy is aligned with priorities set by the Department of Energy (DOE), the National Nuclear Security Administration (NNSA), and national strategy guidance documents, such as the Nuclear Posture Review, the National Security Strategy, and the Blueprint for a Secure Energy Future

Los Alamos is the senior laboratory in the DOE system, and executes work in all areas of the DOE mission: national security, science, energy, and environmental management. The laboratory also performs work for the Department of Defense (DoD), Intelligence Community (IC), and Department of Homeland Security (DHS), among others. The laboratory's multidisciplinary scientific capabilities and activities are organized into six Capability Pillars:
 * Information, Science and Technology (IS&T)
 * Materials for the Future seeks to optimize materials for national security applications by predicting and controlling their performance and functionality through discovery science and engineering.
 * Nuclear and Particle Futures integrates nuclear experiments, theory, and simulation to understand and engineer complex nuclear phenomena.
 * Science of Signatures (SoS) applies science and technology to intransigent problems of system identification and characterization in areas of global security, nuclear defense, energy, and health.
 * Complex Natural and Engineered Systems (CNES)
 * Weapons Systems (WS)

Los Alamos operates three main user facilities: As of 2017, the Los Alamos National Laboratory is using data and algorithms to possibly protect public health by tracking the growth of infectious diseases. Digital epidemiologists at the lab's Information Systems and Modeling group are using clinical surveillance data, Google search queries, census data, Wikipedia, and even tweets to create a system that could predict epidemics. The team is using data from Brazil as its model; Brazil was notably threatened by the Zika virus as it prepared to host the Summer Olympics in 2016.
 * 1) The Center for Integrated Nanotechnologies: The Center for Integrated Nanotechnologies is a DOE/Office of Science National User Facility operated jointly by Sandia and Los Alamos National Laboratories with facilities at both Laboratories. CINT is dedicated to establishing the scientific principles that govern the design, performance, and integration of nanoscale materials into microscale and macroscale systems and devices.
 * 2) Los Alamos Neutron Science Center (LANSCE): The Los Alamos Neutron Science Center is one of the world's most powerful linear accelerators. LANSCE provides the scientific community with intense sources of neutrons with the capability of performing experiments supporting civilian and national security research. This facility is sponsored by the Department of Energy, the National Nuclear Security Administration, Office of Science and Office of Nuclear Energy, Science and Technology.
 * 3) The National High Magnetic Field Laboratory (NHMFL), Pulsed Field Facility: The Pulsed Field Facility at Los Alamos National Laboratory in Los Alamos, New Mexico, is one of three campuses of the National High Magnetic Field Laboratory (NHMFL), the other two being at Florida State University, Tallahassee and the University of Florida. The Pulsed Field Facility at Los Alamos National Laboratory operates an international user program for research in high magnetic fields.

Laboratory management and operations
Within LANL's 43-square-mile property are approximately 2,000 dumpsites which have contaminated the environment. It also contributed to thousands of dumpsites at 108 locations in 29 US states.

Contract changes
Continuing efforts to make the laboratory more efficient led the Department of Energy to open its contract with the University of California to bids from other vendors in 2003. Though the university and the laboratory had difficult relations many times since their first World War II contract, this was the first time that the university ever had to compete for management of the laboratory. The University of California decided to create a private company with the Bechtel Corporation, Washington Group International, and the BWX Technologies to bid on the contract to operate the laboratory. The UC/Bechtel led corporation—Los Alamos National Security, LLC (LANS)—was pitted against a team formed by the University of Texas System partnered with Lockheed-Martin. In December 2005, the Department of Energy announced that LANS had won the next seven-year contract to manage and operate the laboratory.

On June 1, 2006, the University of California ended its sixty years of direct involvement in operating Los Alamos National Laboratory, and management control of the laboratory was taken over by Los Alamos National Security, LLC with effect October 1, 2007. Approximately 95% of the former 10,000 plus UC employees at LANL were rehired by LANS to continue working at LANL. Other than UC appointing three members to the eleven member board of directors that oversees LANS, UC now has virtually no responsibility or direct involvement in LANL. UC policies and regulations that apply to UC campuses and its two national laboratories in California (Lawrence Berkeley and Lawrence Livermore) no longer apply to LANL, and the LANL director no longer reports to the UC Regents or UC Office of the President.

On June 8, 2018, the NNSA announced that Triad National Security, LLC, a joint venture between Battelle Memorial Institute, the University of California, and Texas A&M University, would assume operation and management of LANL beginning November 1, 2018.

Safety management
In August 2011, the close placement of eight plutonium rods for a photo nearly led to a criticality incident. The photo shoot, which was directed by the laboratory's management, was one of several factors relating to unsafe management practices that led to the departure of 12 of the lab's 14 safety staff. The criticality incident was one of several that led the Department of Energy to seek alternative bids to manage the laboratory after the 2018 expiration of the LANS contract.

The lab was penalized with a $57 million reduction in its 2014 budget over the February 14, 2014, accident at the Waste Isolation Pilot Plant for which it was partly responsible.

In August 2017, the improper storage of plutonium metal could have triggered a criticality accident, and subsequently staff failed to declare the failure as required by procedure.

Extended operations
With support of the National Science Foundation, LANL operates one of the three National High Magnetic Field Laboratories in conjunction with and located at two other sites Florida State University in Tallahassee, Florida, and University of Florida in Gainesville, Florida.

Los Alamos National Laboratory is a partner in the Joint Genome Institute (JGI) located in Walnut Creek, California. JGI was founded in 1997 to unite the expertise and resources in genome mapping, DNA sequencing, technology development, and information sciences pioneered at the three genome centers at University of California's Lawrence Berkeley National Laboratory (LBNL), Lawrence Livermore National Laboratory (LLNL), and LANL.

The Integrated Computing Network (ICN) is a multi-security level network at the LANL integrating large host supercomputers, a file server, a batch server, a printer and graphics output server and numerous other general purpose and specialized systems. IBM Roadrunner, which was part of this network, was the first supercomputer to hit petaflop speeds.

Until 1999, The Los Alamos National Laboratory hosted the arXiv e-print archive. The arXiv is currently operated and funded by Cornell University.

The coreboot project was initially developed at LANL.

In the recent years, the Laboratory has developed a major research program in systems biology modeling, known at LANL under the name q-bio.

Several serials are published by LANL:
 * National Security Science
 * 1663
 * Community Connections
 * Actinide Research Quarterly
 * @theBradbury
 * Physical Sciences Vistas

LANL also published Los Alamos Science from 1980 to 2005, as well as the Nuclear Weapons Journal, which was replaced by National Security Science after two issues in 2009.

Controversy and criticism
In 2005, Congress held new hearings on lingering security issues at Los Alamos National Weapons Laboratory in New Mexico; documented problems continued to be ignored.

In November 2008, a drum containing nuclear waste was ruptured due to a 'deflagration' according to an inspector general report of the Dept. of Energy, which due to lab mistakes, also occurred in 2014 at the Carlsbad plant with significant disruptions and costs across the industry.

In 2009, 69 computers which did not contain classified information were lost. The same year also saw a scare in which 1 kg (2.2 lb) of missing plutonium prompted a Department of Energy investigation into the laboratory. The investigation found that the "missing plutonium" was a result of miscalculation by LANL's statisticians and did not actually exist; but the investigation did lead to heavy criticism of the laboratory by the DOE for security flaws and weaknesses that the DOE claimed to have found.

Institutional statistics
LANL is northern New Mexico's largest institution and the largest employer with approximately 8,762 direct employees, 277 guard force, 505 contractors, 1,613 students, 1,143 unionized craft workers, and 452 post-doctoral researchers. Additionally, there are roughly 120 DOE employees stationed at the laboratory to provide federal oversight of LANL's work and operations. Approximately one-third of the laboratory's technical staff members are physicists, one-quarter are engineers, one-sixth are chemists and materials scientists, and the remainder work in mathematics and computational science, biology, geoscience, and other disciplines. Professional scientists and students also come to Los Alamos as visitors to participate in scientific projects. The staff collaborates with universities and industry in both basic and applied research to develop resources for the future. The annual budget is approximately US$2.2 billion.

Directors

 * J. Robert Oppenheimer (1942–1945)
 * Norris Bradbury (1945–1970)
 * Harold Agnew (1970–1979)
 * Donald Kerr (1979–1986)
 * Siegfried S. Hecker (1986–1997)
 * John C. Browne (1997–2003)
 * George Peter Nanos (2003–2005)
 * Robert W. Kuckuck (2005–2006)
 * Michael R. Anastasio (2006–2011)
 * Charles F. McMillan (2011–2017)
 * Terry Wallace (2018)
 * Thomas Mason (2018–present)

Notable scientists

 * Stirling Colgate (1925–2013)
 * George Cowan (1920–2012), American physical chemist, businessman, and philanthropist
 * Mitchell Feigenbaum (1944–2019)
 * Richard Feynman (1918–1988)
 * Bette Korber
 * Maria Goeppert Mayer (1906–1972)
 * Howard O. McMahon (1914–1990), Canadian-born American electrical engineer, inventor of the Gifford-McMahon cryocooler, and the Science Director, Vice President, Head of the Research and Development Division, and then President of Arthur D. Little, Inc; lived and worked partially in Los Alamos during development of the first Hydrogen bomb
 * Emily Willbanks (1930–2007)

Archival collections

 * Los Alamos University notebooks, 1945-1946, Niels Bohr Library & Archives

title: Los Alamos National Laboratory


text:
Oak Ridge National Laboratory

Oak Ridge National Laboratory (ORNL) is a federally funded research and development center in Oak Ridge, Tennessee, United States. Founded in 1943, the laboratory is now sponsored by the United States Department of Energy and administered by UT–Battelle, LLC.

Established in 1943, ORNL is the largest science and energy national laboratory in the Department of Energy system by size and third largest by annual budget. It is located in the Roane County section of Oak Ridge. Its scientific programs focus on materials, nuclear science, neutron science, energy, high-performance computing, environmental science, systems biology and national security, sometimes in partnership with the state of Tennessee, universities and other industries.

ORNL has several of the world's top supercomputers, including Frontier, ranked by the TOP500 as the world's most powerful. The lab is a leading neutron and nuclear power research facility that includes the Spallation Neutron Source, the High Flux Isotope Reactor, and the Center for Nanophase Materials Sciences.

Overview
Oak Ridge National Laboratory is managed by UT–Battelle, a limited liability partnership between the University of Tennessee and the Battelle Memorial Institute, formed in 2000 for that purpose. The annual budget is US$2.4 billion. As of 2021 there is a staff of 5,700 working at ORNL, around 2,000 of whom are scientists and engineers, and an additional 3,200 guest researchers annually.

There are five campuses on the Department of Energy's Oak Ridge reservation: the National Laboratory, the Y-12 National Security Complex, the East Tennessee Technology Park (formerly the Oak Ridge Gaseous Diffusion Plant), the Oak Ridge Institute for Science and Education, and the developing Oak Ridge Science and Technology Park, although the four other facilities are unrelated to the National Laboratory. The total area of the reservation is 150 square kilometres (58 sq mi) of which the lab takes up 18 square kilometres (7 sq mi).

History

In 1934 the Freel Farm Mound Site, an archaeological site and burial mound of the Late Woodland period was excavated. The site is currently inundated by Melton Hill Lake.

The city of Oak Ridge was established by the Army Corps of Engineers as part of the Clinton Engineer Works in 1942 on isolated farm land as part of the Manhattan Project. During World War II, advanced research for the government was managed at the site by the University of Chicago's Metallurgical Laboratory. In 1943, construction of the Clinton Laboratories, what would later be known as the Oak Ridge National Laboratory, was completed. The site was chosen for the X-10 Graphite Reactor, used to produce plutonium from natural uranium. Enrico Fermi and his colleagues developed the world's second self-sustaining nuclear reactor after Fermi's previous experiment, the Chicago Pile-1. The X-10 was the first reactor designed for continuous operation.

After the end of World War II, management of the lab was contracted by the US government to Monsanto; however, they withdrew in 1947. The University of Chicago temporarily re-assumed responsibility, with the site receiving the prestigious "National" laboratory designation, until in December 1947, when Union Carbide and Carbon Co., which already operated two other facilities at Oak Ridge, took control of the laboratory and renamed the site Oak Ridge National Laboratory (ORNL).

Post-war, the demand for military science had fallen dramatically, and the future of the lab was uncertain. The X-10 reactor and the laboratory's 1,000 employees were no longer involved in nuclear weapons. Instead, it was used for scientific research. In 1946 the first medical isotopes were produced in the X-10 reactor, and by 1950 almost 20,000 samples had been shipped to various hospitals. The quantity and variety of radionuclides produced by X-10 for medicine grew steadily in the 1950s. ORNL was the only Western source of californium-252. ORNL scientists also performed the world's first successful bone marrow transplant in mice by suppressing their immune systems.

In 1950 the Oak Ridge School of Reactor Technology was established with two courses in reactor operation and safety; almost 1,000 students graduated. Much of the research performed at ORNL in the 1950s was related to nuclear reactors as a form of energy production, both for propulsion and electricity. More reactors were built in the 1950s than in the rest of the ORNL's history combined. One of their most influential projects was the light-water reactor, a precursor to many modern nuclear power stations. The US Military funded much of its development, for nuclear-powered submarines and ships of the US Navy. The US Army also contracted the design of portable nuclear reactors in 1953 for heat and electricity generation in remote military bases. The reactors were produced by the American Locomotive Company and used in Greenland, the Panama Canal Zone, and Antarctica. The US Air Force also contributed funding to three reactors, the lab's first computers, and its first particle accelerators. ORNL built its first molten salt reactor in 1954 as a proof-of-concept for a proposed fleet of long-range bombers, but it was never used. Alvin M. Weinberg was named Director of Research, ORNL, and in 1955 Director of the Laboratory. In the early 1960s there was a large push at ORNL to develop nuclear-powered desalination plants, where deserts met the sea, to provide water. The project, called Water for Peace, was backed by John F. Kennedy and Lyndon B. Johnson and was presented at a 1964 United Nations conference, but increases in the cost of construction and falling public confidence in nuclear power caused the plan to be shuttered. The Health Physics Research Reactor built in 1962 was used for radiation exposure experiments leading to more accurate dosage limits and dosimeters, and improved radiation shielding.

In 1964 the Molten-Salt Reactor Experiment began with the construction of the reactor. It operated from 1966 until 1969 (with six months down time to move from U-235 to U-233 fuel) and proved the viability of molten salt reactors, while also producing fuel for other reactors as a byproduct of its own reaction. The High Flux Isotope Reactor built in 1965 had the highest neutron flux of any reactor at the time. It improved upon the work of the X-10 reactor, producing more medical isotopes as well as allowing higher fidelity of materials research. Researchers in the biology division studied the effects of chemicals on mice, including petrol fumes, pesticides, and tobacco.

In the late 1960s, cuts in funding led to the cancellation of plans for another particle accelerator, and the United States Atomic Energy Commission cut the breeder reactor program by two-thirds, leading to a downsizing in staff from 5,000 to 3,800. In the 1970s, the prospect of fusion power was strongly considered, sparking research at ORNL. A tokamak called ORMAK, made operational in 1971, was the first tokamak to achieve a plasma temperature of 20 million Kelvin. After the success of the fusion experiments, it was enlarged and renamed ORMAK II in 1973; however, the experiments ultimately failed to lead to fusion power plants.

The US Atomic Energy Commission (AEC) required improved safety standards in the early 1970s for nuclear reactors, so ORNL staff wrote almost 100 requirements covering many factors including fuel transport and earthquake resistance. In 1972 the AEC held a series of public hearings where emergency cooling requirements were highlighted and the safety requirements became more stringent. Also in 1972, Peter Mazur, a biologist at ORNL, froze with liquid nitrogen, thawed and implanted mouse embryos in a surrogate mother. The mouse pups were born healthy. The technique is popular in the livestock industry, as it allows the embryos of valuable cattle to be transported easily and a prize cow can have multiple eggs extracted and thus, through in vitro fertilisation, have many more offspring than would naturally be possible.

In 1974 Alvin Weinberg, director of the lab for 19 years, was replaced by Herman Postma, a fusion scientist. In 1977 construction began for 6 metre (20 foot) superconducting electromagnets, intended to control fusion reactions. The project was an international effort: three electromagnets were produced in the US, one in Japan, one in Switzerland and the final by remaining European states. ORNL was involved in analysing the damage to the core of the Three Mile Island Nuclear Generating Station after the accident in 1979.

The 1980s brought more changes to ORNL: a focus on efficiency became paramount. An accelerated climate simulation chamber was built that applied varying weather conditions to insulation to test its efficacy and durability faster than real time. Materials research into heat resistant ceramics for use in truck and high-tech car engines was performed, building upon the materials research that began in the nuclear reactors of the 1950s. In 1987 the High Temperature Materials Laboratory was established, where ORNL and industry researchers cooperated on ceramic and alloy projects. The materials research budget at ORNL doubled after initial uncertainty regarding Reagan's economic policy of less government expenditure. In 1981, the Holifield Heavy Ion Research Facility, a 25 MV particle accelerator, was opened at ORNL. At the time, Holifield had the widest range of ion species and was twice as powerful as other accelerators, attracting hundreds of guest researchers each year.

The Department of Energy was concerned with the pollution surrounding ORNL, and it began clean-up efforts. Burial trenches and leaking pipes had contaminated the groundwater beneath the lab, and radiation tanks were sitting idle, full of waste. Estimates of the total cost of clean-up were into the hundreds of millions of US dollars. The five older reactors were subjected to safety reviews in 1987, ordered to be deactivated until the reviews were complete. By 1989 when the High Flux Isotope Reactor was restarted, the US supply of certain medical isotopes was depleted. In 1989 the former executive officer of the American Association for the Advancement of Science, Alvin Trivelpiece, became director of ORNL; he remained in the role until 2000.

In 1992 whistleblower Charles Varnadore filed complaints against ORNL, alleging safety violations and retaliation by his superiors. While an administrative law judge ruled in Varnadore's favor, Secretary of Labor Robert Reich overturned that ruling. However, Varnadore's case saw prime contractor Martin Marietta cited for safety violations and ultimately led to additional whistleblower protection within DOE.

In January 2019 ORNL announced a major breakthrough in its capacity to automate Pu-238 production which helped push annual production from 50 grams to 400 grams, moving closer to NASA's goal of 1.5 kilograms per year by 2025 in order to sustain its space exploration programs.

Areas of research
ORNL conducts research and development activities that span a wide range of scientific disciplines. Many research areas have a significant overlap with each other; researchers often work in two or more of the fields listed here. The laboratory's major research areas are described briefly below.
 * Chemical sciences: ORNL conducts both fundamental and applied research in numerous areas, including catalysis, surface science and interfacial chemistry; molecular transformations and fuel chemistry; heavy element chemistry and radioactive materials characterization; aqueous solution chemistry and geochemistry; mass spectrometry and laser spectroscopy; separations chemistry; materials chemistry including synthesis and characterization of polymers and other soft materials; chemical biosciences; and neutron science.
 * Electron microscopy: the program investigates key issues in condensed matter, materials, chemical and nanosciences.
 * Nuclear medicine: research is focused on the development of improved reactor production and processing methods to provide medical radioisotopes, the development of new radionuclide generator systems, the design and evaluation of new radiopharmaceuticals for applications in nuclear medicine, and oncology.
 * Physics: research is focused primarily on studies of the fundamental properties of matter at the atomic, nuclear, and subnuclear levels and the development of experimental devices in support of these studies.
 * Population: ORNL provides federal, state and international organizations with a gridded population database, called Landscan, for estimating ambient population. LandScan is a raster image, or grid, of population counts, which provides human population estimates every 30 x 30 arc seconds, which translates roughly to population estimates for 1 kilometer square windows or grid cells at the Equator, with cell width decreasing at higher latitudes. Though many population datasets exist, LandScan is the best spatial population dataset, updated annually. Landscan data are accessible through GIS applications and a USAID public domain application called Population Explorer.

Energy
The laboratory has a long history of energy research; nuclear reactor experiments have been conducted since the end of World War II in 1945. Because of the availability of reactors and high-performance computing resources, an emphasis on improving the efficiency of nuclear reactors is present. The programs develop more efficient materials, more accurate simulations of aging reactor cores, sensors and controls as well as safety procedures for regulatory authorities.

The Energy Efficiency and Electricity Technologies Program aims to improve air quality in the US and reduce dependence on foreign oil supplies. There are three key areas of research: electricity, manufacturing and mobility. The electricity division focuses on reducing electricity consumption and finding alternative sources for production. Buildings, which account for 39% of US electricity consumption as of 2012, are a key area of research as the program aims to create affordable, carbon-neutral homes. Research also takes place into higher efficiency solar panels, geothermal electricity and heating, lower cost wind generators, and the economic and environmental feasibility of potential hydro power plants.

The Fusion Energy Division pursues short-term goals to develop components such as high-temperature superconductors, high-speed hydrogen pellet injectors, and suitable materials for future fusion research. Much research into the behaviour and maintenance of plasma takes place at the Fusion Energy Division to further the understanding of plasma physics, a crucial area for developing a fusion power plant. The US ITER office is at ORNL with partners at Princeton Plasma Physics Laboratory and Savannah River National Laboratory. The US contribution to the ITER project is 9.1% which is expected to be in excess of US$1.6 billion throughout the contract. ORNL researchers participated in developing of an extensive research plan for the US-ITER collaboration detailed in 2022.

Biology
Biological research covers ecology, forestry, genomics, computational biology, structural biology and bioinformatics. The BioEnergy Program aims to improve the efficiency of all stages of the biofuel process to improve the energy security of the United States. The program aims to make genetic improvements to the potential biomass used, formulate methods for refineries that can accept a diverse range of fuels, and to improve the efficiency of energy delivery both to power plants and end users.

The Center for Molecular Biophysics conducts research into the behaviour of biological molecules in various conditions. The center hosts projects that examine cell walls for biofuel production, use neutron scattering to analyse protein folding, and simulate the effect of catalysis on a conventional and quantum scale. ORNL is home to a field site for the National Ecological Observatory Network (NEON), which has a field office nearby. The Department of Energy works closely with the Tennessee Wildlife Resources Agency out of ORNL to monitor forest ecology for the surrounding Appalachians & Cumberland Plateau Domain of NEON.

Neutron science
There are two neutron sources at ORNL; the High Flux Isotope Reactor (HFIR) and the Spallation Neutron Source (SNS). HFIR provides neutrons in a stable beam resulting from a constant nuclear reaction whereas SNS, a particle accelerator, produces pulses of neutrons. HFIR went critical in 1965 and has been used for materials research and as a major source of medical radioisotopes since. As of 2013, HFIR provides the world's highest constant neutron flux as a result of various upgrades. Berkelium-249, used to synthesize tennessine for the first time, was produced in the HFIR as part of an international effort. HFIR is likely to operate until approximately 2060 before the reactor pressure vessel is considered unsafe for continued use.

The SNS has the highest intensity neutron pulses of any human-made neutron source. SNS was made operational in 2006 and has since been upgraded to 1 megawatt with plans to continue up to 3 MW. High-power neutron pulses permit clearer images of the targets, meaning smaller samples can be analysed and accurate results require fewer pulses.

Materials
Between 2002 and 2008 ORNL partnered with Caterpillar Inc. to form a new material for their diesel engines that can withstand large temperature fluctuations. The new steel, named CF8C Plus, is based on conventional CF8C stainless steel with added manganese and nitrogen; the result has better high–temperature properties and is easier to cast at a similar cost. In 2003 the partners received an R&D 100 award from R&D magazine and in 2009 received an award for "excellence in technology transfer" from the Federal Laboratory Consortium for the commercialisation of the steel.

There is a high-temperature materials lab at ORNL that permits researchers from universities, private companies and other government initiatives to use their facilities. As is the case for all designated user facilities, the resources of the High Temperature Materials Laboratory are available for free if the results are published; private research is permitted but requires payment.

The Center for Nanophase Materials Sciences (CNMS) researches the behaviour and fabrication of nanomaterials. The center emphasises discovery of new materials and the understanding of underlying physical and chemical interactions that enable creation of nanomaterials. In 2012, CNMS produced a lithium-sulfide battery with a theoretical energy density three to five times greater than existing lithium ion batteries.

Security
ORNL provides resources to the United States Department of Homeland Security and other defense programs. The Global Security and Nonproliferation (GS&N) program develops and implements policies, both US based and international, to prevent the proliferation of nuclear material. The program has developed safeguards for nuclear arsenals, guidelines for dismantling arsenals, plans of action should nuclear material fall into unauthorised hands, detection methods for stolen or missing nuclear material, and trade of nuclear material between the US and Russia. The GS&N's work overlaps with that of the Homeland Security Programs Office, providing detection of nuclear material and nonproliferation guidelines. Other areas concerning the Department Homeland Security include nuclear and radiological forensics, chemical and biological agent detection using mass spectrometry, and simulations of potential national hazards.

High-performance computing
ORNL has been the site of various supercomputers, home to the fastest on several occasions. In 1953, ORNL partnered with the Argonne National Laboratory to build ORACLE (Oak Ridge Automatic Computer and Logical Engine), a computer to research nuclear physics, chemistry, biology, and engineering. ORACLE had 2048 words (80 Kibit) of memory and took approximately 590 microseconds to perform addition or multiplication of integers. In the 1960s ORNL was equipped with an IBM 360/91 and an IBM 360/65. In 1995 ORNL bought an Intel Paragon based computer called the Intel Paragon XP/S 150 that performed at 154 gigaFLOPS and ranked third on the TOP500 list of supercomputers. In 2005 Jaguar was built, a Cray XT3-based system that performed at 25 teraFLOPS and received incremental upgrades up to the XT5 platform that performed at 2.3 petaFLOPS in 2009. It was recognised as the world's fastest from November 2009 until November 2010. Summit was built for Oak Ridge National Laboratory during 2018, which benchmarked at 122.3 petaFLOPS. As of June 2020, Summit was the world's second fastest [clocked] supercomputer with 202,752 CPU cores, 27,648 Nvidia Tesla GPUs, and 250 Petabytes of storage, having lost the top position to the Japanese Fugaku supercomputer. In May 2022, the ORNL Frontier system broke the exascale barrier, achieving 1.102 exaflop/s using 8,730,112 cores.

Since 1992 the Center for Computational Sciences has overseen high performance computing at ORNL. It manages the Oak Ridge Leadership Computing Facility that contains the machines. In 2012, Jaguar was upgraded to the XK7 platform, a fundamental change as GPUs are used for the majority of processing, and renamed Titan. Titan performed at 17.59 petaFLOPS and held the number 1 spot on the TOP500 list for November 2012. Other computers include a 77 node cluster to visualise data that the larger machines output in the Exploratory Visualization Environment for Research in Science and Technology (EVEREST), a visualisation room with a 10 by 3 metre (30 by 10 ft) wall that displays 35 megapixel projections. Smoky is an 80 node linux cluster used for application development. Research projects are refined and tested on Smoky before running on larger machines such as Titan.

In 1989 programmers at the Oak Ridge National Lab wrote the first version of Parallel Virtual Machine (PVM), software that enables distributed computing on machines of differing specifications. PVM is free software and has become the de facto standard for distributed computing. Jack Dongarra of ORNL and the University of Tennessee wrote the LINPACK software library and LINPACK benchmarks, used to calculate linear algebra and the standard method of measuring floating point performance of a supercomputer as used by the TOP500 organisation.

Notable people
• Elda Emma Anderson

• Manson Benedict

• Leslie Benmark

• Jane Blankenship

• Everitt P. Blizard

• Lyle Benjamin Borst

• Hermann Bottenbruch

• Marilyn A. Brown

• Thure E. Cerling

• Robert Coveyou

• Sheldon Datz

• Jack Dongarra

• John H. Ebersole

• Julie Ezold

• John H. Gibbons

• Amit Goyal

• Eugene Guth

• Michael Heath

• Linda Horton

• Alston Scott Householder

• Chun-Hway Hsueh

• George Samuel Hurst

• Mujaddid Ahmed Ijaz

• Sergei V. Kalinin

• William Rudolph Kanne

• Cresson Kearny

• Tamara G. Kolda

• Clarence Larson

• Henri A. Levy

• Dan Lindsley

• Herbert G. MacPherson

• William Madia

• Thomas Mason

• Jim May

• Dade Moeller

• G. William Morgan

• Karl Z. Morgan

• Stephen E. Nagler

• Jagdish Narayan

• Peter Nellist

• C. Maurice Patterson

• Clarice Phelps

• Frances Pleasonton

• Ward Plummer

• Herman Postma

• Red Raper

• Hyman G. Rickover

• Larry Robinson

• Amy Rosemond

• Liane Russell

• Clifford Shull

• Dorothy Martin Simon

• David Joseph Singh

• Nicholas M. Smith Jr.

• Olaf Storaasli

• Stephen Streiffer

• Jan B. Talbot

• Arpad Vass

• Alvin M. Weinberg

• Eugene Wigner

• Ernest O. Wollan

• Ying Xu

• Herbert York

• Gale J. Young

• Thomas Zacharia

title: Oak Ridge National Laboratory


text:
Der fliegende Holländer

Der fliegende Holländer (The Flying Dutchman), WWV 63, is a German-language opera, with libretto and music by Richard Wagner. The central theme is redemption through love. Wagner conducted the premiere at the Königliches Hoftheater Dresden in 1843.

Wagner claimed in his 1870 autobiography Mein Leben that he had been inspired to write the opera following a stormy sea crossing he made from Riga to London in July and August 1839. In his 1843 Autobiographic Sketch, Wagner acknowledged he had taken the story from Heinrich Heine's retelling of the legend in his 1833 satirical novel The Memoirs of Mister von Schnabelewopski (Aus den Memoiren des Herrn von Schnabelewopski).

This work shows early attempts at operatic styles that would characterise his later music dramas. In Der fliegende Holländer Wagner uses a number of leitmotifs (literally, "leading motifs") associated with the characters and themes. The leitmotifs are all introduced in the overture, which begins with a well-known ocean or storm motif before moving into the Dutchman and Senta motifs.

Wagner originally wrote the work to be performed without intermission – an example of his efforts to break with tradition – and, while today's opera houses sometimes still follow this directive, it is also performed in a three-act version.

The autograph manuscript of the opera is preserved in the Richard Wagner Foundation.

Composition history
At the beginning of 1839, the 26-year-old Richard Wagner was employed as a conductor at the Court Theatre in Riga. His extravagant lifestyle plus the retirement from the stage of his actress wife, Minna Planer, caused him to run up huge debts that he was unable to repay. Wagner was writing Rienzi and hatched a plan to flee his creditors in Riga, escape to Paris via London and make his fortune by putting Rienzi on to the stage of the Paris Opéra. However, this plan quickly turned to disaster: his passport having been seized by the authorities on behalf of his creditors, he and Minna had to make a dangerous and illegal crossing over the Prussian border, during which Minna suffered a miscarriage. Boarding the ship Thetis, whose captain had agreed to take them without passports, their sea journey was hindered by storms and high seas. The ship at one point took refuge in the Norwegian fjords at Tvedestrand, and a trip that was expected to take eight days finally delivered Wagner to London three weeks after leaving Riga.

Wagner's experience of Paris was also disastrous. He was unable to get work as a conductor, and the Opéra did not want to produce Rienzi. The Wagners were reduced to poverty, relying on handouts from friends and from the little income that Wagner could make writing articles on music and copying scores. Wagner hit on the idea of a one-act opera on the theme of the Flying Dutchman, which he hoped might be performed before a ballet at the Opéra. "The voyage through the Norwegian reefs made a wonderful impression on my imagination; the legend of the Flying Dutchman, which the sailors verified, took on a distinctive, strange colouring that only my sea adventures could have given it." Wagner wrote the first prose draft of the story in Paris early in May 1840, basing the story on Heinrich Heine's satire "The Memoirs of Mister von Schnabelewopski" ("Aus den Memoiren des Herrn von Schnabelewopski") published in Der Salon in 1834. In Heine's tale, the narrator watches a performance of a fictitious stage play on the theme of the sea captain cursed to sail forever for blasphemy. Heine introduces the character as a Wandering Jew of the ocean, and also added the device taken up so vigorously by Wagner in this, and many subsequent operas: the Dutchman can only be redeemed by the love of a faithful woman. In Heine's version, this is presented as a means for ironic humour; however, Wagner took this theme literally and in his draft, the woman is faithful until death.

By the end of May 1841 Wagner had completed the libretto or poem as he preferred to call it. Composition of the music had begun during May to July of the previous year, 1840, when Wagner wrote Senta's Ballad, the Norwegian Sailors' song in act 3 ("Steuermann, lass die Wacht!") and the subsequent Phantom song of the Dutchman's crew in the same scene. These were composed for an audition at the Paris Opéra, along with the sketch of the plot. Wagner actually sold the sketch to the Director of the Opéra, Léon Pillet, for 500 francs, but was unable to convince him that the music was worth anything. Wagner composed the rest of the Der fliegende Holländer during the summer of 1841, with the Overture being written last, and by November 1841 the orchestration of the score was complete. While this score was designed to be played continuously in a single act, Wagner later divided the piece into a three-act work. In doing so, however, he did not alter the music significantly, but merely interrupted transitions that had originally been crafted to flow seamlessly (the original one-act layout is restored in some performances).

In his original draft Wagner set the action in Scotland, but he changed the location to Norway shortly before the first production staged in Dresden and conducted by himself in January 1843.

In his essay "A Communication to My Friends" in 1851, Wagner claimed that The Dutchman represented a new start for him: "From here begins my career as poet, and my farewell to the mere concoctor of opera-texts." Indeed, to this day the opera is the earliest of Wagner's works to be performed at the Bayreuth Festival, and, at least for that theatre, marks the start of the mature Wagner canon.

Instrumentation
Der fliegende Holländer is scored for the following instruments:

 * piccolo, 2 flutes, 2 oboes (one doubling cor anglais), 2 clarinets, 2 bassoons
 * 4 horns, 2 trumpets, 3 trombones, bass tuba
 * timpani
 * harp
 * 1st and 2nd violins, violas, violoncellos, and double basses

on-stage
 * 3 piccolos, 6 horns, tam tam, wind machine

Synopsis

 * Place: On the coast of Norway

Act 1
On his homeward journey, the sea captain Daland is compelled by stormy weather to seek a port of refuge near Sandwike in southern Norway. He leaves the helmsman on watch and he and the sailors retire. (Song of the helmsman: "Mit Gewitter und Sturm aus fernem Meer" – "With tempest and storm on distant seas.") The helmsman falls asleep. A ghostly vessel appearing astern is dashed against Daland's vessel by the sea and the grappling irons hold the two ships together. Invisible hands furl the sails. A man of pale aspect, dressed in black, his face framed by a thick black beard, steps ashore. He laments his fate. (Aria: "Die Frist ist um, und abermals verstrichen sind sieben Jahr" – "The time has come and seven years have again elapsed") Because he once invoked Satan, the ghost captain is cursed to roam the sea forever without rest. An angel brought to him the terms of his redemption: Every seven years the waves will cast him upon the shore; if he can find a wife who will be true to him he will be released from his curse.

Daland wakes up and meets the stranger. The stranger hears that Daland has an unmarried daughter named Senta, and he asks for her hand in marriage, offering a chest of treasure as a gift. Tempted by gold, Daland agrees to the marriage. The southwind blows and both vessels set sail for Daland's home.

Act 2
A group of local girls are singing and spinning in Daland's house. (Spinning chorus: "Summ und brumm, du gutes Rädchen" – "Whir and whirl, good wheel") Senta, Daland's daughter, dreamily gazes upon a gorgeous picture of the legendary Dutchman that hangs from the wall; she desires to save him. Against the will of her nurse, she sings to her friends the story of the Dutchman (Ballad with the Leitmotiv), how Satan heard him swear and took him at his word. She vows to save him by her fidelity.

The huntsman Erik, Senta's former boyfriend, arrives and hears her; the girls depart, and the huntsman, who loves the maiden, warns her, telling her of his dream, in which Daland returned with a mysterious stranger, who carried her off to sea. She listens with delight, and Erik leaves in despair.

Daland arrives with the stranger; he and Senta stand gazing at each other in silence. Daland is scarcely noticed by his daughter, even when he presents his guest as her betrothed. In the following duet, which closes the act, Senta swears to be true till death.

Act 3
Later in the evening, the local girls bring Daland's men food and drink. They invite the crew of the strange vessel to join in the merry-making, but in vain. The girls retire in wonder; ghostly forms appear at work upon the vessel, and Daland's men retreat in fear.

Senta arrives, followed by Erik, who reproves her for deserting him, as she had formerly loved him and vowed constancy. When the stranger, who has been listening, hears these words, he is overwhelmed with despair, as he thinks he is now forever lost. He summons his men, tells Senta of the curse, and to the consternation of Daland and his crew declares that he is "Der fliegende Holländer."

As the Dutchman sets sail, Senta throws herself into the sea, claiming that she will be faithful to him unto death. This is his salvation. The spectral ship disappears, and Senta and the Dutchman are seen ascending to heaven.

title: Der fliegende Holländer


text:
Lohengrin (opera)

Lohengrin ( in German), WWV 75, is a Romantic opera in three acts composed and written by Richard Wagner, first performed in 1850. The story of the eponymous character is taken from medieval German romance, notably the Parzival of Wolfram von Eschenbach, and its sequel Lohengrin, itself inspired by the epic of Garin le Loherain. It is part of the Knight of the Swan legend.

The opera has inspired other works of art. King Ludwig II of Bavaria named his castle Neuschwanstein Castle after the Swan Knight. It was King Ludwig's patronage that later gave Wagner the means and opportunity to complete, build a theatre for, and stage his epic cycle Der Ring des Nibelungen. He had discontinued composing it at the end of Act II of Siegfried, the third of the Ring tetralogy, to create his radical chromatic masterpiece of the late 1850s, Tristan und Isolde, and his lyrical comic opera of the mid-1860s, Die Meistersinger von Nürnberg.

The most popular and recognizable part of the opera is the Bridal Chorus, colloquially known in English-speaking countries as "Here Comes the Bride," usually played as a processional at weddings. The orchestral preludes to Acts I and III are also frequently performed separately as concert pieces.

The autograph manuscript of the opera is preserved in the Richard Wagner Foundation.

Literary background
The literary figure of Lohengrin first appeared as a supporting character in the final chapter of the medieval epic poem Parzival of Wolfram von Eschenbach. The Grail Knight Lohengrin, son of the Grail King Parzival, is sent to the duchess of Brabant to defend her. His protection comes under the condition that she must never ask his name. If she violates this requirement, he will be forced to leave her. Wagner took up these characters and set the "forbidden question" theme at the core of a story which makes contrasts between the godly and the mundane, and between Early Middle Age Christendom and Germanic paganism. Wagner attempted at the same time to weave elements of Greek tragedy into the plot. He wrote the following in Mitteilungen an meine Freunde about his Lohengrin plans:"Who doesn't know 'Zeus and Semele'? The god is in love with a human woman and approaches her in human form. The lover finds that she cannot recognize the god in this form, and demands that he should make the real sensual form of his being known. Zeus knows that she would be destroyed by the sight of his real self. He suffers in this awareness, suffers knowing that he must fulfill this demand and in doing so ruin their love. He will seal his own doom when the gleam of his godly form destroys his lover. Is the man who craves for God not destroyed?"

Composition
Lohengrin was written and composed between 1845 and 1848 when Wagner worked as Kapellmeister at the Royal Dresden court. The opera's genesis, however, starts some years earlier when Wagner was living and working in Paris. By late 1841, Wagner had conceived a five-act historical opera based on the Hohenstaufen dynasty entitled Die Sarazenin (The Saracen Woman) and, although he lavished on it all the trappings of Grand Opera, his attention was soon distracted by a Volksbuch that he obtained through his friendship with the philologist Samuel Lehrs. The book in question was Ludwig Bechstein's 1835 anthology of legends Der Sagenschatz und die Sagenkreise des Thüringerlandes. As well as being the means by which Wagner first became aware of the Lohengrin legend, the anthology also retold the tale of Tannhäuser.

Seeking a more authentic picture of the Tannhäuser legend, Lehrs then provided Wagner with the annual proceedings of the Königsberg Germanic Society which not only included C.T.L. Lucas's critical study of the "Wartburg war" but also included a piece of criticism about the poem Lohengrin, together with a lengthy narrative of the rambling epic's principal content. Thus, Wagner admits, with one blow a whole new world was opened to him, and although unable to find the form to master the material for his own dramatic purpose, he could clearly visualize Lohengrin and it remained as an inextinguishable image within him.

Stewart Spencer neither regards the abandonment of the Hohenstaufen projects during the 1840s at this time nor, more specifically, in the musical and formal dissimilarities between Rienzi and Der fliegende Holländer as symptomatic of a fundamental turn from history towards myth. Instead Spencer argues that Wagner did not draw any fundamental distinction between history and myth, and that Wagner's response to myth is dynamic and dialectical. History per se might be arid and reductive but it contained within it the potential for a categorical interpretation allowing Wagner to make use of Leopold August Warnkönig's (1835–42), three volume Flandrische Staats- und Rechtsgeschichte bis zum Jahr 1305 to be mined for an accurate evocation of 10th century Brabant. It would be nearly four years before Wagner's image of Lohengrin would again manifest itself to his creative imagination.

Writing retrospectively in his 1865 biography (even if its royal patronage diminishes its reliability), Wagner tells the story of how Lohengrin's libretto was written. In the summer of 1845 Wagner with his wife Minna planned their annual hydrotherapeutic visit to Marienbad. Putting his work as Kapellmeister at the Royal Dresden court out of his mind, Wagner's intention was to abandon himself to a life of the utmost leisure, and he had chosen his summer reading with care: the poems of Wolfram von Eschenbach, and the anonymous epic of Lohengrin with an introduction by Joseph von Görres. His plan to lie beside a brook communing with Titurel and Parzival didn't last long and the longing to create was overpowering:

"Lohengrin stood suddenly revealed before me in full armor at the center of a comprehensive dramatic adaptation of the whole material. ... I struggled manfully against the temptation to set down the plan on paper. But I was fooling myself: no sooner had I stepped into the noonday bath than I was seized by such desire to write Lohengrin that, incapable of lingering in the bath for the prescribed hour, I leapt out after only a few minutes, scarcely took the time to clothe myself again properly, and ran like a madman to my quarters to put what was obsessing me on paper. This went on for several days, until the entire dramatic plan for Lohengrin had been set down in full detail."

By 3 August 1845 he had worked out the prose draft. Wagner, with his head in a whirl, wrote to his brother, Albert, the following day, 4 August 1845:

"...it was in this frame of mind yesterday that I finished writing out a very full & detailed scenario for Lohengrin; I am delighted with the result, indeed I freely admit that it fills me with a feeling of proud contentment. ... the more familiar I have become with my new subject & the more profoundly I have grasped its central idea, the more it has dawned upon me how rich & luxurious the seed of this new idea is, a seed which has grown into so full & burgeoning a flower that I feel happy indeed. ...In creating this work, my powers of invention & sense of formal structure have played their biggest part to date: the medieval poem which has preserved this highly poetical legend contains the most inadequate & pedestrian account to have come down to us, and I feel very fortunate to have satisfied my desire to rescue what by now is an almost unrecognizable legend from the rubble & decay to which the medieval poet has reduced the poem as a result of his inferior & prosaic treatment of it, & to have restored it to its rich & highly poetical potential by dint of my own inventiveness & reworking of it. – But quite apart from all this, how felicitous a libretto it has turned out to be! Effective, attractive, impressive & affecting in all its parts! – Johanna]'s role in it (Albert's daughter – see illustration below) – which is very important & in point of fact the principal role in the work – is bound to turn out the most charming & most moving in the world."

Between May and June 1846, Wagner made a through-composed draft for the whole work that consisted of only two staves: one for the voice, the other just indicating the harmonies. Coterminously, Wagner began work on a second draft of the poem, beginning with Act III. The complete draft of Act III was completed before the second draft of Acts I and II. This has sometime led to the erroneous conclusion that the entire work was completed from the end to the front. On 9 September 1846 Wagner began to elaborate the instrumental and choral parts, which, along with the Prelude, was completed on 29 August 1847.

Numerous changes to the poem, particularly Act III, took place during work on the second draft. At this time Wagner was still trying to clarify the precise nature of the tragedy, and the extent to which he needed to spell out the mechanics of the tragedy to the audience. On 30 May 1846 Wagner wrote to the journalist Hermann Franck (writer) regarding the relationship between Lohengrin and Elsa. It is apparent from the letter that Wagner and Franck had been discussing Lohengrin for some time, and Wagner refers back to an earlier argument about the relationship between Lohengrin and Elsa, and in particular whether Elsa's punishment of separation from Lohengrin at the end of the opera is justifiable. Wagner uses the letter firstly to argue in favour of his version and secondly to expand upon the more general mythical structure underpinning the relationship between Lohengrin and Elsa – a theme he would publicly develop in his 1851 autobiographical essay A Communication To My Friends. Elsa's punishment, Wagner argues, cannot be chastisement or death but that her separation from Lohengrin: 'this idea of separation- which, if it were left out, would require a total transformation of the subject and probably allow no more than its most superficial externals to be retained'. Franck's concern appears to be that this particular punishment of separation will make the opera incapable 'of being dramatically effective in a unified way'. Wagner confesses that Franck's concerns have forced him to look objectively at the poem and to consider ways of making Lohengrin's involvement in the tragic outcome clearer than had previously been the case. To this end, Wagner decided not to alter Act I or II but to write new lines in Act III:

O Elsa! Was hast du mir angethan? Als meine Augen dich zuerst ersah'n, zu dir fühlt' ich in Liebe mich entbrannt, (Wagner wrote five additional lines here but they were rejected in the final draft).

Later, in the same act, when Elsa calls on Lohengrin to punish her, the latter replies:

Nur eine Strafe giebt's für dein Vergeh'n ach, mich wie dich trifft ihre herbe Pein! Getrennt, geschieden sollen wir uns seh'n diess muss die Strafe, diess die Sühne sein!

Wagner asks Franck if he should explicitly mention the specific rule associated with the Grail which, although not expressly forbidding the Grail knights from committing such excesses, nevertheless, discourages them from acting in this way. Wagner's opinion is that it should be sufficient for the audience to deduce the Grail's advice. Readers of the libretto in English will note that in Amanda Holden's 1990 singing translation for the English National Opera, the Grail's advice is transformed into an explicit commandment, with Holden acknowledging, on her website, that translating a libretto is effectively writing a new one "despite its compulsory faithfulness to the original".

There's one atonement, penance for your crime! Ah! I as you suffer this cruel pain! We must be parted! You must understand: this the atonement, this the Grail's command!

Having completed the second complete draft of Act III ten months later on 5 March 1847, Wagner returned to the beginning of Act I and began work on the second draft of Act I on 12 May and which was complete on 8 June 1847. The second complete draft of Act II was started on 18 June and complete on 2 August 1847. In a letter to Ferdinand Heine dated 6 August 1847, Wagner announced that he had completed the Lohengrin opera:

"I feel pleased and happy as a result, since I am well satisfied with what I have done."

As outlined to Heine, Wagner's plan was to build on the success of the premiere of Rienzi in Berlin on 24 October 1847 with a follow-up performance of Lohengrin. As it turned out Rienzi in Berlin was not a success and Lohengrin was not performed there until 1859.

Composition of the full score began three months later on 1 January 1848, and by 28 April 1848 the composition of Lohengrin was complete. In September 1848 Wagner conducted excerpts from Act I at a concert in Dresden to mark the 300th anniversary of the court orchestra (later Dresden Staatskapelle).

Musical style
Lohengrin occupies an ambiguous position within Wagner's aesthetic oeuvre. Despite Wagner's ostensible rejection of French grand opéra, Lohengrin, like all Wagner's operas, and for that matter his later musikdramas, owes some debt to the form as practised by Auber, Halévy and, irrespective of what Wagner sets out in his prose writings, Meyerbeer. Lohengrin is also the last of Wagner's four "Romantic" operas, and continues with the associative style of tonality that he had previously developed in Tannhäuser. And Lohengrin is also the last of his composed works before his political exile, and despite the seventeen-year-long performance hiatus, Lohengrin's musical style nevertheless anticipates Wagner's future leitmotif technique.

Performance history
The first production of Lohengrin was in Weimar, Germany, on 28 August 1850 at the Staatskapelle Weimar under the direction of Franz Liszt, a close friend and early supporter of Wagner. Liszt chose the date in honour of Weimar's most famous citizen, Johann Wolfgang von Goethe, who was born on 28 August 1749. Despite the inadequacies of the lead tenor Karl Beck, it was an immediate popular success.

Wagner himself was unable to attend the first performance, having been exiled because of his part in the 1849 May Uprising in Dresden. Although he conducted various extracts in concert in Zurich, London, Paris and Brussels, it was not until 1861 in Vienna that he was able to attend a full performance.

The opera's first performance outside German-speaking lands was in Riga on 5 February 1855. The Austrian premiere took place in Vienna at the Theater am Kärntnertor on 19 August 1858, with Róza Csillag as Ortrud. The work was produced in Munich for the first time at the National Theatre on 16 June 1867, with Heinrich Vogl in the title role and Mathilde Mallinger as Elsa. Mallinger also took the role of Elsa in the work's premiere at the Berlin State Opera on 6 April 1869.

Lohengrin's Russian premiere, outside Riga, took place at the Mariinsky Theatre on 16 October 1868.

The Belgian premiere of the opera was given at La Monnaie on 22 March 1870 with Étienne Troy as Friedrich von Telramund and Feliciano Pons as Heinrich der Vogler.

The United States premiere of Lohengrin took place at the Stadt Theater at the Bowery in New York City on 3 April 1871. Conducted by Adolf Neuendorff, the cast included Theodor Habelmann as Lohengrin, Luise Garay-Lichtmay as Elsa, Marie Frederici as Ortrud, Adolf Franosch as Heinrich and Edward Vierling as Telramund. The first performance in Italy took place seven months later at the Teatro Comunale di Bologna on 1 November 1871 in an Italian translation by operatic baritone Salvatore Marchesi (musician). It was notably the first performance of any Wagner opera in Italy. Angelo Mariani conducted the performance, which starred Italo Campanini as Lohengrin, Bianca Blume as Elsa, Maria Löwe Destin as Ortrud, Pietro Silenzi as Telramund, and Giuseppe Galvani as Heinrich der Vogler. The performance on 9 November was attended by Giuseppe Verdi, who annotated a copy of the vocal score with his impressions and opinions of Wagner (this was almost certainly his first exposure to Wagner's music).

La Scala produced the opera for the first time on 30 March 1873, with Campanini as Lohengrin, Gabrielle Krauss as Elsa, Philippine von Edelsberg as Ortrud, Victor Maurel as Friedrich, and Gian Pietro Milesi as Heinrich.

The United Kingdom premiere of Lohengrin took place at the Royal Opera House, Covent Garden, on 8 May 1875 using the Italian translation by Marchesi. Auguste Vianesi conducted the performance, which featured Ernesto Nicolini as Lohengrin, Emma Albani as Elsa, Anna D'Angeri as Ortruda, Maurel as Friedrich, and Wladyslaw Seideman as Heinrich. The opera's first performance in Australia took place at the Prince of Wales Theatre in Melbourne on 18 August 1877. The Metropolitan Opera mounted the opera for the first time on 7 November 1883, in Italian, during the company's inaugural season. Campanini portrayed the title role with Christina Nilsson as Elsa, Emmy Fursch-Madi as Ortrud, Giuseppe Kaschmann as Telramund, Franco Novara as Heinrich, and Auguste Vianesi conducting.

Lohengrin was first publicly performed in France at the Eden-Théâtre in Paris on 30 April 1887 in a French translation by Charles-Louis-Étienne Nuitter. Conducted by Charles Lamoureux, the performance starred Ernest van Dyck as the title hero, Fidès Devriès as Elsa, Marthe Duvivier as Ortrud, Emil Blauwaert as Telramund, and Félix-Adolphe Couturier as Heinrich. There was however an 1881 French performance given as a Benefit, in the Cercle de la Méditerranée Salon at Nice, organized by Sophie Cruvelli, in which she took the role of Elsa. The opera received its Canadian premiere at the opera house in Vancouver on 9 February 1891 with Emma Juch as Elsa. The Palais Garnier staged the work for the first time the following 16 September with van Dyck as Lohengrin, Rose Caron as Elsa, Caroline Fiérens-Peters as Ortrud, Maurice Renaud as Telramund and Charles Douaillier as Heinrich.

The first Chicago performance of the opera took place at the Auditorium Building (now part of Roosevelt University) on 9 November 1891. Performed in Italian, the production starred Jean de Reszke as the title hero, Emma Eames as Elsa and Édouard de Reszke as Heinrich.

Lohengrin was first performed as part of the Bayreuth Festival in 1894, in a production directed by the composer's widow, Cosima Wagner, with Willi Birrenkoven and Ernst van Dyck, Emil Gerhäuser alternating as Lohengrin, Lillian Nordica as Elsa, Marie Brema as Ortrud and Demeter Popovic as Telramund and was conducted by Felix Mottl. It received 6 performances in its first season in the opera house that Wagner built for the presentation of his works.

A typical performance lasts from about 3 hours, 30–50 minutes.

Instrumentation
Lohengrin is scored for the following instruments:
 * 3 flutes (3rd doubles piccolo), 3 oboes, English horn, 3 clarinets in B-flat, A and C, bass clarinet in B-flat and A, 3 bassoons
 * 4 horns, 3 trumpets, 3 trombones, tuba
 * timpani, triangle, cymbals, tambourine
 * harp
 * 1st and 2nd violins, violas, violoncellos, and double basses

on-stage
 * 3 flutes, piccolo, 3 oboes, 3 clarinets in B-flat, A and C, 3 bassoons
 * 4 horns, 12 trumpets, 4 trombones
 * timpani in D, triangle, cymbals, military drums
 * organ, harp

Synopsis

 * Place: Antwerp, on the Scheldt River, in the Duchy of Lotharingia
 * Time: Sometime between 925, when Henry the Fowler acquired Lotharingia as a vassal state, and 933, when his wars with the Magyars ended

Summary
The people of the Brabant are divided by quarrels and political infighting; also, a devious hostile power left over from the region's pagan past is seeking to subvert the prevailing monotheistic government and to return Brabant to pagan rule. A mysterious knight, sent by God and possessing superhuman charisma and fighting ability, arrives to unite and strengthen the people, and to defend the innocent noblewoman Elsa from a false accusation of murder, but he imposes a condition: the people must follow him without knowing his identity. Elsa in particular must never ask his name, or his heritage, or his origin. The conspirators attempt to undermine her faith in her rescuer, to create doubt among the people, and to force him to leave.

Act 1
King Henry the Fowler has arrived in Brabant, where he has assembled the German tribes in order to expel the marauding Hungarians from his dominions. He also needs to settle a dispute involving the disappearance of the child-Duke Gottfried of Brabant. The Duke's guardian, Count Friedrich von Telramund, has accused the Duke's older sister, Elsa, of murdering her brother in order to become Duchess of Brabant. Telramund calls upon the King to punish Elsa and to make him the new Duke of Brabant.

The King calls for Elsa to answer Telramund's accusation. Elsa does not answer the King's inquiries, only lamenting her brother's fate ("Einsam in trüben Tagen"). The King declares that he cannot resolve the matter and will leave it to God's judgment through ordeal by combat. Telramund, a strong and seasoned warrior, agrees enthusiastically. When the King asks Elsa who shall be her champion, Elsa describes a knight she has beheld in her dreams ("Des Ritters will ich wahren").

Twice the Herald calls for a champion to step forward, but gets no response. Elsa kneels and prays that God may send her champion to her. A boat drawn by a swan appears on the river and in it stands a knight in shining armour. He disembarks, dismisses the swan, respectfully greets the king, and asks Elsa if she will have him as her champion and marry him. Elsa kneels in front of him and places her honour in his keeping. He asks only one thing in return for his service: Elsa must never ask him his name or where he has come from. Elsa agrees to this ("Wenn ich im Kampfe für dich siege").

Telramund's supporters advise him to withdraw because he cannot prevail against the Knight's powers, but he proudly refuses. The chorus prays to God for victory for the one whose cause is just. Ortrud, Telramund's wife, does not join the prayer, but privately expresses confidence that Telramund will win. The combat commences. The unknown Knight defeats Telramund but spares his life ("Durch Gottes Sieg ist jetzt dein Leben mein"). Taking Elsa by the hand, he declares her innocent. The crowd exits, cheering and celebrating.

Act 2
Night in the courtyard outside the cathedral

Telramund and Ortrud, banished from court, listen unhappily to the distant party-music. Ortrud reveals that she is a pagan witch (daughter of Radbod Duke of Frisia), and tries to revive Telramund's courage, assuring him that her people (and he) are destined to rule the kingdom again. She plots to induce Elsa to violate the mysterious knight's only condition.

When Elsa appears on the balcony before dawn, she hears Ortrud lamenting and pities her. As Elsa descends to open the castle door, Ortrud prays to her pagan gods, Wodan and Freia, for malice, guile, and cunning, in order to deceive Elsa and restore pagan rule to the region. Ortrud warns Elsa that since she knows nothing about her rescuer, he could leave at any time as suddenly as he came, but Elsa is sure of the Knight's virtues. The two women go into the castle. Left alone outside, Telramund vows to bring about the Knight's downfall.

The sun rises and the people assemble. The Herald announces that Telramund is now banished, and that anyone who follows Telramund shall be considered an outlaw by the law of the land. In addition, he announces that the King has offered to make the unnamed knight the Duke of Brabant; however, the Knight has declined the title, and prefers to be known only as "Protector of Brabant". The Herald further announces that the Knight will lead the people to glorious new conquests, and will celebrate the marriage of himself and Elsa. In the back of the crowd, four noblemen quietly express misgivings to each other because the Knight has rescinded their privileges and is calling them to arms. Telramund secretly draws the four noblemen aside and assures them that he will regain his position and stop the Knight, by accusing him of sorcery.

As Elsa and her attendants are about to enter the church, Ortrud rushes to the front of the procession and challenges Elsa to explain who the Knight is and why anyone should follow him. Their conversation is interrupted by the entrance of the King with the Knight. Elsa tells both of them that Ortrud was interrupting the ceremony. The King tells Ortrud to step aside, then leads Elsa and the Knight toward the church. Just as they are about to enter the church, Telramund enters. He claims that his defeat in combat was invalid because the Knight did not give his name (trial by combat traditionally being open only to established citizens), then accuses the Knight of sorcery. He demands that the Knight must reveal his name; otherwise the King should rule the trial by combat invalid. The Knight refuses to reveal his identity and claims that only one person in the world has the right to make him do so: his beloved Elsa, and she has pledged not to exercise that right. Elsa, though visibly shaken and uncertain, assures him of her confidence. King Henry refuses Telramund's questions, and the nobles of Brabant and Saxony praise and honor the Knight. Elsa falls back into the crowd where Ortrud and Telramund try to intimidate her, but the Knight forces them both to leave the ceremony, and consoles Elsa. Elsa takes one last look at the banished Ortrud, then enters the church with the wedding procession.

Act 3
Scene 1: The bridal chamber

Elsa and her new husband are ushered in with the well-known bridal chorus, and they express their love for each other. Ortrud's words, however, have made an impression on Elsa; she laments that her name sounds so sweet on her husband's lips but she cannot utter his name. She asks him to tell her his name when no one else is around, but at all instances he refuses. Finally, despite his warnings, she asks the Knight the fatal questions. Before the Knight can answer, Telramund and his four recruits rush into the room in order to attack him. The Knight defeats and kills Telramund. Then, he sorrowfully turns to Elsa and asks her to follow him to the King, to whom he will now reveal his secrets.

Scene 2: On the banks of the Scheldt (as in act 1)

The troops arrive equipped for war. Telramund's corpse is brought in. Elsa comes forward, then the Knight. He tells the King that Elsa has broken her promise, and discloses his identity ("In fernem Land") by recounting the story of the Holy Grail and of Monsalvat. He reveals himself as Lohengrin, Knight of the Grail and son of King Parsifal, sent to protect an unjustly accused woman. The laws of the Holy Grail say that Knights of the Grail must remain anonymous. If their identity is revealed, they must return home.

As Lohengrin sadly bids farewell to Elsa, the swan-boat reappears. Lohengrin tells Elsa that if she had kept her promise, she could have recovered her lost brother, and gives her his sword, horn and ring, for he is to become the future leader of Brabant. As Lohengrin tries to get in the boat, Ortrud appears. She tells Elsa that the swan is actually Gottfried, Elsa's brother, whom she cursed to become a swan. The people consider Ortrud guilty of witchcraft. Lohengrin prays and the swan turns back into young Gottfried. Lohengrin declares him the Duke of Brabant. Ortrud sinks as she sees her plans thwarted.

A dove descends from heaven and, taking the place of the swan at the head of the boat, leads Lohengrin to the castle of the Holy Grail. A grief-stricken Elsa falls to the ground dead.

Notable arias and excerpts

 * Act I
 * Prelude
 * "Einsam in trüben Tagen" (Elsa's Narrative)
 * Scene "Wenn ich im Kampfe für dich siege"
 * Act II
 * "Durch dich musst' ich verlieren" (Telramund)
 * "Euch lüften, die mein Klagen" (Elsa)
 * Scene 4 opening, "Elsa's Procession to the Cathedral"
 * Act III
 * Prelude
 * Bridal Chorus "Treulich geführt"
 * "Das süsse Lied verhallt" (Love duet)
 * "Höchstes Vertrau'n" (Lohengrin's Declaration to Elsa)
 * "In fernem Land" (Lohengrin's Narration)
 * "Mein lieber Schwan... O Elsa! Nur ein Jahr an deiner Seite" (Lohengrin's Farewell)

Interpretations
Liszt initially requested Wagner to carefully translate his essay on the opera from French into German, that he might be the principal and long-standing interpreter of the work – a work which, after performing, he regarded as "a sublime work from one end to the other".

In their article "Elsa's reason: on beliefs and motives in Wagner's Lohengrin", Ilias Chrissochoidis and Steffen Huck propose what they describe as "a complex and psychologically more compelling account [of the opera]. Elsa asks the forbidden question because she needs to confirm Lohengrin's belief in her innocence, a belief that Ortrud successfully erodes in Act II. This interpretation reveals Elsa as a rational individual, upgrades the dramatic significance of the Act I combat scene, and, more broadly, signals a return to a hermeneutics of Wagnerian drama."

Operatic mishaps
Tenors have sometimes run into trouble in the third act, just before Lohengrin departs by stepping on a swan-driven vessel or on the swan itself. In 1913, the Moravian tenor Leo Slezak is reported to have missed hopping on the swan, afterwards turning to Elsa with the question: "Wann geht der nächste Schwan?" ("When does the next swan leave?"). In 1936, at the Metropolitan Opera, the same thing happened to Danish tenor Lauritz Melchior.

title: Lohengrin (opera)