Ernest Lawrence

Ernest Orlando Lawrence (August 8, 1901 – August 27, 1958) was a pioneering American nuclear scientist and winner of the Nobel Prize in Physics in 1939 for his invention of the cyclotron. He is known for his work on uranium-isotope separation for the Manhattan Project, as well as for founding the Lawrence Berkeley National Laboratory and the Lawrence Livermore National Laboratory.

A graduate of the University of South Dakota and University of Minnesota, Lawrence obtained a PhD in physics at Yale in 1925. In 1928, he was hired as an associate professor of physics at the University of California, Berkeley, becoming the youngest full professor there two years later. In its library one evening, Lawrence was intrigued by a diagram of an accelerator that produced high-energy particles. He contemplated how it could be made compact, and came up with an idea for a circular accelerating chamber between the poles of an electromagnet. The result was the first cyclotron.

Lawrence went on to build a series of ever larger and more expensive cyclotrons. His Radiation Laboratory became an official department of the University of California in 1936, with Lawrence as its director. In addition to the use of the cyclotron for physics, Lawrence also supported its use in research into medical uses of radioisotopes. During World War II, Lawrence developed electromagnetic isotope separation at the Radiation Laboratory. It used devices known as calutrons, a hybrid of the standard laboratory mass spectrometer and cyclotron. A huge electromagnetic separation plant was built at Oak Ridge, Tennessee, which came to be called Y-12. The process was inefficient, but it worked.

After the war, Lawrence campaigned extensively for government sponsorship of large scientific programs, and was a forceful advocate of "Big Science", with its requirements for big machines and big money. Lawrence strongly backed Edward Teller's campaign for a second nuclear weapons laboratory, which Lawrence located in Livermore, California. After his death, the Regents of the University of California renamed the Lawrence Livermore National Laboratory and Lawrence Berkeley National Laboratory after him. Chemical element number 103 was named lawrencium in his honor after its discovery at Berkeley in 1961.

Ernest O. Lawrence
Head and shoulders of a man wearing rimless glasses, and a dark suit and tie
Lawrence in 1939
Born
Ernest Orlando Lawrence

August 8, 1901
DiedAugust 27, 1958 (aged 57)
ResidenceBerkeley, California
NationalityAmerican
Alma materUniversity of South Dakota, B.A.
University of Minnesota, M.A.
Yale University, Ph.D.
Known forInvention of the cyclotron
Manhattan Project
Spouse(s)Mary K. "Molly" (Blumer) Lawrence (1910–2003)
(m. 1932–1958, his death)
Children2 sons, 4 daughters
Awards
Scientific career
FieldsPhysics
InstitutionsUniversity of California, Berkeley
Yale University
ThesisThe Photoelectric Effect in Potassium Vapor as a Function of the Frequency of the Light (1924)
Doctoral advisorWilliam Francis Gray Swann
Doctoral studentsEdwin McMillan
Chien-Shiung Wu
Milton S. Livingston
Kenneth Ross MacKenzie
John Reginald Richardson
Signature
Ernest O Lawrence signature

Early life

Ernest Orlando Lawrence was born in Canton, South Dakota on August 8, 1901. His parents, Carl Gustavus and Gunda (née Jacobson) Lawrence, were both the offspring of Norwegian immigrants who had met while teaching at the high school in Canton, where his father was also the superintendent of schools. He had a younger brother, John H. Lawrence, who would become a physician, and was a pioneer in the field of nuclear medicine. Growing up, his best friend was Merle Tuve, who would also go on to become a highly accomplished physicist.[1]

Lawrence attended the public schools of Canton and Pierre, then enrolled at St. Olaf College in Northfield, Minnesota, but transferred after a year to the University of South Dakota in Vermillion.[2] He completed his bachelor's degree in chemistry in 1922,[3] and his Master of Arts (M.A.) degree in physics from the University of Minnesota in 1923 under the supervision of William Francis Gray Swann. For his master's thesis, Lawrence built an experimental apparatus that rotated an ellipsoid through a magnetic field.[4][5][6]

Lawrence followed Swann to the University of Chicago, and then to Yale University in New Haven, Connecticut, where Lawrence completed his Doctor of Philosophy (Ph.D.) degree in physics in 1925 as a Sloane Fellow,[7] writing his doctoral thesis on the photoelectric effect in potassium vapor.[8][9] He was elected a member of Sigma Xi, and, on Swann's recommendation, received a National Research Council fellowship. Instead of using it to travel to Europe, as was customary at the time, he remained at Yale University with Swann as a researcher.[10]

With Jesse Beams from the University of Virginia, Lawrence continued to research the photoelectric effect. They showed that photoelectrons appeared within 2 x 10−9 seconds of the photons striking the photoelectric surface—close to the limit of measurement at the time. Reducing the emission time by switching the light source on and off rapidly made the spectrum of energy emitted broader, in conformance with Werner Heisenberg's uncertainty principle.[11]

Early career

In 1926 and 1927, Lawrence received offers of assistant professorships from the University of Washington in Seattle and the University of California at a salary of $3,500 per annum. Yale promptly matched the offer of the assistant professorship, but at a salary of $3,000. Lawrence chose to stay at the more prestigious Yale,[12] but because he had never been an instructor, the appointment was resented by some of his fellow faculty, and in the eyes of many it still did not compensate for his South Dakota immigrant background.[13]

Lawrence was hired as an associate professor of physics at the University of California in 1928, and two years later became a full professor, becoming the university's youngest professor.[7] Robert Gordon Sproul, who became university president the day after Lawrence became a professor,[14] was a member of the Bohemian Club, and he sponsored Lawrence's membership in 1932. Through this club, Lawrence met William Henry Crocker, Edwin Pauley, and John Francis Neylan. They were influential men who helped him obtain money for his energetic nuclear particle investigations. There was a great hope for medical uses to come from the development of particle physics, and this led to much of the early funding for advances Lawrence was able to obtain.[15]

While at Yale, Lawrence met Mary Kimberly (Molly) Blumer, the eldest of four daughters of George Blumer, the dean of the Yale School of Medicine.[16][17] They first met in 1926 and became engaged in 1931,[18] and were married on May 14, 1932, at Trinity Church on the Green in New Haven, Connecticut.[19] They had six children: Eric, Margaret, Mary, Robert, Barbara, and Susan.[16][20] Lawrence named his son Robert after theoretical physicist Robert Oppenheimer, his closest friend in Berkeley.[21][22][23] In 1941, Molly's sister Elsie married Edwin McMillan,[18] who would go on to win the Nobel Prize in Chemistry in 1951.[24]

The development of the cyclotron

Invention

The invention that brought Lawrence to international fame started out as a sketch on a scrap of a paper napkin. While sitting in the library one evening in 1929, Lawrence glanced over a journal article by Rolf Widerøe,[25] and was intrigued by one of the diagrams.[26] This depicted a device that produced high-energy particles by means of a succession of small "pushes". The device depicted was laid out in a straight line using increasingly longer electrodes.[27] At the time, physicists were beginning to explore the atomic nucleus. In 1919, the New Zealand physicist Ernest Rutherford had fired alpha particles into nitrogen and had succeeded in knocking protons out of some of the nuclei. But nuclei have a positive charge that repels other positively charged nuclei, and they are bound together tightly by a force that physicists were only just beginning to understand. To break them up, to disintegrate them, would require much higher energies, of the order of millions of volts.[28]

Cyclotron patent
Diagram of cyclotron operation from Lawrence's 1934 patent

Lawrence saw that such a particle accelerator would soon become too long and unwieldy for his university laboratory. In pondering a way to make the accelerator more compact, Lawrence decided to set a circular accelerating chamber between the poles of an electromagnet. The magnetic field would hold the charged protons in a spiral path as they were accelerated between just two semicircular electrodes connected to an alternating potential. After a hundred turns or so, the protons would impact the target as a beam of high-energy particles. Lawrence excitedly told his colleagues that he had discovered a method for obtaining particles of very high energy without the use of any high voltage.[29] He initially worked with Niels Edlefsen. Their first cyclotron was made out of brass, wire, and sealing wax and was only four inches (10 cm) in diameter—it could literally be held in one hand, and probably cost $25 in all.[20][30]

What Lawrence needed to develop the idea was capable of graduate students to do the work. Edlefsen left to take up an assistant professorship in September 1930, and Lawrence replaced him with David H. Sloan and M. Stanley Livingston,[23] who he set to work on developing Widerøe's accelerator and Edlefsen's cyclotron, respectively. Both had their own financial support. Both designs proved practical, and by May 1931, Sloan's linear accelerator was able to accelerate ions to 1 MeV.[31] Livingston had a greater technical challenge, but when he applied 1,800 V to his 11-inch cyclotron on January 2, 1931, he got 80,000-electron volt protons spinning around. A week later, he had 1.22 MeV with 3,000 V, more than enough for his Ph.D. thesis on its construction.[32]

Development

Lawrence Compton Bush Conant Compton Loomis 83d40m March 1940 meeting UCB
Meeting at Berkeley in 1940 concerning the planned 184-inch (4.67 m) cyclotron (seen on the blackboard): Lawrence, Arthur Compton, Vannevar Bush, James B. Conant, Karl T. Compton, and Alfred Lee Loomis

In what would become a recurring pattern, as soon as there was the first sign of success, Lawrence started planning a new, bigger machine. Lawrence and Livingston drew up a design for a 27-inch (69 cm) cyclotron in early 1932. The magnet for the $800 11-inch cyclotron weighed 2 tons, but Lawrence found a massive 80-ton magnet rusting in a junkyard in Palo Alto for the 27-inch that had originally been built during World War I to power a transatlantic radio link.[33][34] In the cyclotron, he had a powerful scientific instrument, but this did not translate into scientific discovery. In April 1932, John Cockcroft and Ernest Walton at the Cavendish Laboratory in England announced that they had bombarded lithium with protons and succeeded in transmuting it into helium. The energy required turned out to be quite low—well within the capability of the 11-inch cyclotron. On learning about it, Lawrence sent a wire to Berkeley and asked for Cockcroft and Walton's results to be verified. It took the team until September to do so, mainly due to lack of adequate detection apparatus.[35]

Although important discoveries continued to elude Lawrence's Radiation Laboratory, mainly due to its focus on the development of the cyclotron rather than its scientific use, through his increasingly larger machines, Lawrence was able to provide crucial equipment needed for experiments in high energy physics. Around this device, he built what became the world's foremost laboratory for the new field of nuclear physics research in the 1930s. He received a patent for the cyclotron in 1934,[36] which he assigned to the Research Corporation,[37] a private foundation that funded much of Lawrence's early work.[38]

In February 1936, Harvard University's president, James B. Conant, made attractive offers to Lawrence and Oppenheimer.[39] The University of California's president, Robert Gordon Sproul, responded by improving conditions. The Radiation Laboratory became an official department of the University of California on July 1, 1936, with Lawrence formally appointed its director, with a full-time assistant director, and the University agreed to make $20,000 a year available for its research activities.[40] Lawrence employed a simple business model: "He staffed his laboratory with graduate students and junior faculty of the physics department, with fresh Ph.D.s willing to work for anything, and with fellowship holders and wealthy guests able to serve for nothing."[41]

Reception

Using the new 27-inch cyclotron, the team at Berkeley discovered that every element that they bombarded with recently discovered deuterium emitted energy, and in the same range. They, therefore, postulated the existence of a new and hitherto unknown particle that was a possible source of limitless energy.[42] William Laurence of The New York Times described Lawrence as "a new miracle worker of science".[43] At Cockroft's invitation, Lawrence attended the 1933 Solvay Conference in Belgium. This was a regular gathering of the world's top physicists. Nearly all were from Europe, but occasionally an outstanding American scientist like Robert A. Millikan or Arthur Compton would be invited to attend. Lawrence was asked to give a presentation on the cyclotron. [44] Lawrence's claims of limitless energy met a very different reception in Solvay. He ran into withering skepticism from the Cavendish Laboratory's James Chadwick, the physicist who had discovered the neutron in 1932, for which he had been awarded the Nobel Prize in 1935. In a British accent that sounded condescending to American ears, Chadwick suggested that what Lawrence's team was observing was contamination of their apparatus.[45]

60-inch cyclotron, c 1930s. This shows the (9660569583)
The 60-inch (1.52 m) cyclotron soon after completion in 1939. The key figures in its development and use are shown, standing, left to right: D. Cooksey, D. Corson, Lawrence, R. Thornton, J, Backus, W.S. Sainsbury. In the background are Luis Walter Alvarez and Edwin McMillan.

When he returned to Berkeley, Lawrence mobilized his team to go painstakingly over the results to gather enough evidence to convince Chadwick. Meanwhile, at the Cavendish laboratory, Rutherford and Mark Oliphant found that deuterium fuses to form helium-3, which causes the effect that the cyclotroneers had observed. Not only was Chadwick correct in that they had been observing contamination, but they had overlooked yet another important discovery, that of nuclear fusion.[46] Lawrence's response was to press on with the creation of still larger cyclotrons. The 27-inch cyclotron was superseded by a 37-inch cyclotron in June 1937,[47] which in turn was superseded by a 60-inch cyclotron in May 1939. It was used to bombard iron and produced its first radioactive isotopes in June.[48]

As it was easier to raise money for medical purposes, particularly cancer treatment, than for nuclear physics, Lawrence encouraged the use of the cyclotron for medical research. Working with his brother John and Israel Lyon Chaikoff from the University of California's Physiology Department, Lawrence supported research into the use of radioactive isotopes for therapeutic purposes. Phosphorus-32 was easily produced in the cyclotron, and John used it to cure a woman afflicted with polycythemia vera, a blood disease. John used phosphorus-32 created in the 37-inch cyclotron in 1938 in tests on mice with leukemia. He found that the radioactive phosphorus concentrated in the fast-growing cancer cells. This then led to clinical trials on human patients. A 1948 evaluation of the therapy showed that remissions occurred under certain circumstances.[49] Lawrence also had hoped for the medical use of neutrons. The first cancer patient received neutron therapy from the 60-inch cyclotron on November 20.[48] Chaikoff conducted trials on the use of radioactive isotopes as radioactive tracers to explore the mechanism of biochemical reactions.[50]

Lawrence was awarded the Nobel Prize in Physics in November 1939 "for the invention and development of the cyclotron and for results obtained with it, especially with regard to artificial radioactive elements".[51] He was the first at Berkeley as well as the first South Dakotan to become a Nobel Laureate, and the first to be so honored while at a state-supported university. The Nobel award ceremony was held on February 29, 1940, in Berkeley, California, due to World War II, in the auditorium of Wheeler Hall on the campus of the university. Lawrence received his medal from Carl E. Wallerstedt, Sweden's Consul General in San Francisco.[52] Robert W. Wood wrote to Lawrence and presciently noted "As you are laying the foundations for the cataclysmic explosion of uranium ... I'm sure old Nobel would approve."[53]

In March 1940, Arthur Compton, Vannevar Bush, James B. Conant, Karl T. Compton, and Alfred Lee Loomis traveled to Berkeley to discuss Lawrence's proposal for a 184-inch cyclotron with a 4,500-ton magnet that was estimated to cost $2.65 million. The Rockefeller Foundation put up $1.15 million to get the project started.[54]

World War II and the Manhattan Project

Radiation Laboratory

After the outbreak of World War II in Europe, Lawrence became drawn into military projects. He helped recruit staff for the MIT Radiation Laboratory, where American physicists developed the cavity magnetron invented by Oliphant's team in Britain. The name of the new laboratory was deliberately copied from Lawrence's laboratory in Berkeley for security reasons. He also became involved in recruiting staff for underwater sound laboratories to develop techniques for detecting German submarines. Meanwhile, work continued at Berkeley with cyclotrons. In December 1940, Glenn T. Seaborg and Emilio Segré used the 60-inch (150 cm) cyclotron to bombard uranium-238 with deuterons producing a new element, neptunium-238, which decayed by beta emission to form plutonium-238. One of its isotopes, plutonium-239, could undergo nuclear fission which provided another way to make an atomic bomb.[55][56][57]

Lawrence offered Segrè a job as a research assistant—a relatively lowly position for someone who had discovered an element—for US$300 a month for six months. However, when Lawrence learned that Segrè was legally trapped in California, he reduced Segrè's salary to US$116 a month.[58] When the regents of the University of California wanted to terminate Segré's employment owing to his foreign nationality, Lawrence managed to retain Segré by hiring him as a part-time lecturer paid by the Rockefeller Foundation. Similar arrangements were made to retain his doctoral students Chien-Shiung Wu (a Chinese national) and Kenneth Ross MacKenzie (a Canadian national) when they graduated.[59]

Diagram of uranium isotope separation in the calutron
Schematic diagram of uranium isotope separation in a calutron

In September 1941, Oliphant met with Lawrence and Oppenheimer at Berkeley, where they showed him the site for the new 184-inch (4.7 m) cyclotron. Oliphant, in turn, took the Americans to task for not following up the recommendations of the British MAUD Committee, which advocated a program to develop an atomic bomb.[60] Lawrence had already thought about the problem of separating the fissile isotope uranium-235 from uranium-238, a process known today as uranium enrichment. Separating uranium isotopes was difficult because the two isotopes have very nearly identical chemical properties, and could only be separated gradually using their small mass differences. Separating isotopes with a mass spectrometer was a technique Oliphant had pioneered with lithium in 1934.[61]

Lawrence began converting his old 37-inch cyclotron into a giant mass spectrometer.[62] On his recommendation, the director of the Manhattan Project, Brigadier General Leslie R. Groves, Jr., appointed Oppenheimer as head of its Los Alamos Laboratory in New Mexico. While the Radiation laboratory developed the electromagnetic uranium enrichment process, the Los Alamos Laboratory designed and constructed the atomic bombs. Like the Radiation Laboratory, it was run by the University of California.[63]

Electromagnetic isotope separation used devices known as calutrons, a hybrid of two laboratory instruments, the mass spectrometer and cyclotron. The name was derived from "California university cyclotrons".[64] In November 1943, Lawrence's team at Berkeley was bolstered by 29 British scientists, including Oliphant.[65][66]

In the electromagnetic process, a magnetic field deflected charged particles according to mass.[67] The process was neither scientifically elegant nor industrially efficient.[68] Compared with a gaseous diffusion plant or a nuclear reactor, an electromagnetic separation plant would consume more scarce materials, require more manpower to operate, and cost more to build. Nonetheless, the process was approved because it was based on proven technology and therefore represented less risk. Moreover, it could be built in stages, and would rapidly reach industrial capacity.[64]

Oak Ridge

Responsibility for the design and construction of the electromagnetic separation plant at Oak Ridge, Tennessee, which came to be called Y-12, was assigned to Stone & Webster. The Calutrons, using 14,700 tons of silver, were manufactured by Allis Chalmers in Milwaukee WI and shipped to Oak Ridge. The design called for five first-stage processing units, known as Alpha racetracks, and two units for final processing, known as Beta racetracks. In September 1943 Groves authorized construction of four more racetracks, known as Alpha II.[69] When the plant was started up for testing on schedule in October 1943, the 14-ton vacuum tanks crept out of alignment because of the power of the magnets and had to be fastened more securely. A more serious problem arose when the magnetic coils started shorting out. In December Groves ordered a magnet to be broken open, and handfuls of rust were found inside. Groves then ordered the racetracks to be torn down and the magnets sent back to the factory to be cleaned. A pickling plant was established on-site to clean the pipes and fittings.[68]

Alpha 1 racetrack, Uranium 235 electromagnetic separation plant, Manhattan Project, Y-12 Oak Ridge
Giant electromagnet Alpha I racetrack for uranium enrichment at Y-12 plant, Oak Ridge, Tennessee, circa 1944–45. The calutrons Lawrence developed are located around the ring.

Tennessee Eastman was hired to manage Y-12.[70] Y-12 initially enriched the uranium-235 content to between 13% and 15%, and shipped the first few hundred grams of this to Los Alamos laboratory in March 1944.[71] Only 1 part in 5,825 of the uranium feed emerged as the final product. The rest was splattered over equipment in the process. Strenuous recovery efforts helped raise production to 10% of the uranium-235 feed by January 1945. In February the Alpha racetracks began receiving slightly enriched (1.4%) feed on the new S-50 thermal diffusion plant. The next month it received enhanced (5%) feed on the K-25 gaseous diffusion plant. By April 1945 K-25 was producing uranium sufficiently enriched to feed directly into the Beta tracks.[71]

On July 16, 1945, Lawrence observed the Trinity nuclear test of the first atomic bomb with Chadwick and Charles A. Thomas. Few were more excited at its success than Lawrence.[72] The question of how to use the now functional weapon on Japan became an issue for the scientists. While Oppenheimer favored no demonstration of the power of the new weapon to Japanese leaders, Lawrence felt strongly that a demonstration would be wise. When a uranium bomb was used without warning in the atomic bombing of Hiroshima, Lawrence felt great pride in his accomplishment.[73]

Lawrence hoped that the Manhattan Project would develop improved calutrons and construct Alpha III racetracks, but they were judged to be uneconomical.[74] The Alpha tracks were closed down in September 1945. Although performing better than ever,[75] they could not compete with K-25 and the new K-27, which commenced operation in January 1946. In December, the Y-12 plant was closed, thereby cutting the Tennessee Eastman payroll from 8,600 to 1,500 and saving $2 million a month.[76] Staff numbers at the Radiation laboratory fell from 1,086 in May 1945 to 424 by the end of the year.[77]

Post-war career

Big Science

After the war, Lawrence campaigned extensively for government sponsorship of large scientific programs. He was a forceful advocate of Big Science with its requirements for big machines and big money, and in 1946 he asked the Manhattan Project for over $2 million for research at the Radiation Laboratory. Groves approved the money, but cut a number of programs, including Seaborg's proposal for a "hot" radiation laboratory in densely populated Berkeley, and John Lawrence's for production of medical isotopes, because this need could now be better met from nuclear reactors. One obstacle was the University of California, which was eager to divest its wartime military obligations. Lawrence and Groves managed to persuade Sproul to accept a contract extension.[78] In 1946, the Manhattan Project spent $7 on physics at the University of California for every dollar spent by the University.[79]

The 184-inch cyclotron was completed with wartime dollars from the Manhattan Project. It incorporated new ideas by Ed McMillan, and was completed as a synchrocyclotron.[81] It commenced operation on November 13, 1946.[82] For the first time since 1935, Lawrence actively participated in the experiments, working unsuccessfully with Eugene Gardner in an attempt to create recently discovered pi mesons with the synchrotron. César Lattes then used the apparatus they had created to find negative pi mesons in 1948.[83]

Responsibility for the national laboratories passed to the newly created Atomic Energy Commission (AEC) on January 1, 1947.[84] That year, Lawrence asked for $15 million for his projects, which included a new linear accelerator and a new gigaelectronvolt synchrotron which became known as the bevatron. The University of California's contract to run the Los Alamos laboratory was due to expire on July 1, 1948, and some board members wished to divest the University of the responsibility for running a site outside California. After some negotiation, the university agreed to extend the contract for what was now the Los Alamos National Laboratory for four more years and to appoint Norris Bradbury, who had replaced Oppenheimer as its director in October 1945, as a professor. Soon after, Lawrence received all the funds he had requested.[85]

HD.4G.019 (10409853774)
Lawrence (right) with Robert Oppenheimer at the 184-inch cyclotron

Notwithstanding the fact that he voted for Franklin Roosevelt, Lawrence was a Republican,[86] who had strongly disapproved of Oppenheimer's efforts before the war to unionize the Radiation Laboratory workers, which Lawrence considered "left wandering activities".[87] Lawrence considered political activity to be a waste of time better spent in scientific research, and preferred that it be kept out of the Radiation Laboratory.[88] In the chilly Cold War climate of the post-war University of California, Lawrence accepted the House Un-American Activities Committee's actions as legitimate, and did not see them as indicative of a systemic problem involving academic freedom or human rights. He was protective of individuals in his laboratory, but even more protective of the reputation of the laboratory.[88] He was forced to defend Radiation Laboratory staff members like Robert Serber who were investigated by the University's Personnel Security Board. In several cases, he issued character references in support of staff. However, Lawrence barred Robert Oppenheimer's brother Frank from the Radiation Laboratory, damaging his relationship with Robert.[89] An acrimonious loyalty oath campaign at the University of California also drove away faculty members.[90] When hearings were held to revoke Robert Oppenheimer's security clearance, Lawrence declined to attend on account of illness, but a transcript in which he was critical of Oppenheimer was presented in his absence. Lawrence's success in building a creative, collaborative laboratory was undermined by the ill-feeling and distrust resulting from political tensions.[88]

Thermonuclear weapons

Lawrence was alarmed by the Soviet Union's first nuclear test in August 1949. The proper response, he concluded, was an all-out effort to build a bigger nuclear weapon: the hydrogen bomb.[91] Lawrence proposed to use accelerators instead of nuclear reactors to produce the neutrons needed to create the tritium the bomb required, as well as plutonium, which was more difficult, as much higher energies would be required.[92] He first proposed the construction of Mark I, a prototype $7 million, 25 MeV linear accelerator, codenamed Materials Test Accelerator (MTA).[92][93] He was soon talking about a new, even larger MTA known as the Mark II, which could produce tritium or plutonium from depleted uranium-238. Serber and Segré attempted in vain to explain the technical problems that made it impractical, but Lawrence felt that they were being unpatriotic.[94][95]

Lawrence strongly backed Edward Teller's campaign for a second nuclear weapons laboratory, which Lawrence proposed to locate with the MTA Mark I at Livermore, California. Lawrence and Teller had to argue their case not only with the Atomic Energy Commission, which did not want it, and the Los Alamos National Laboratory, which was implacably opposed but with proponents who felt that Chicago was the more obvious site for it.[96] The new laboratory at Livermore was finally approved on July 17, 1952, but the Mark II MTA was canceled. By this time, the Atomic Energy Commission had spent $45 million on the Mark I, which had commenced operation, but was mainly used to produce polonium for the nuclear weapons program. Meanwhile, the Brookhaven National Laboratory's Cosmotron had generated a 1 GeV beam.[97]

Death and legacy

In addition to the Nobel Prize, Lawrence received the Elliott Cresson Medal and the Hughes Medal in 1937, the Comstock Prize in Physics in 1938, the Duddell Medal and Prize in 1940, the Holley Medal in 1942, the Medal for Merit in 1946, the William Procter Prize in 1951, Faraday Medal in 1952,[98] and the Enrico Fermi Award from the Atomic Energy Commission in 1957.[99] He was made an Officer of the Legion d'Honneur in 1948,[98] and was the first recipient of the Sylvanus Thayer Award by the US Military Academy in 1958.[100]

In July 1958, President Dwight D. Eisenhower asked Lawrence to travel to Geneva, Switzerland, to help negotiate a proposed Partial Nuclear Test Ban Treaty with the Soviet Union. AEC Chairman Lewis Strauss had pressed for Lawrence's inclusion. The two men had argued the case for the development of the hydrogen bomb, and Strauss had helped raise funds for Lawrence's cyclotron in 1939. Strauss was keen to have Lawrence as part of the Geneva delegation because Lawrence was known to favor continued nuclear testing.[101] Despite suffering from a serious flare-up of his chronic ulcerative colitis, Lawrence decided to go, but he became ill while in Geneva, and was rushed back to the hospital at Stanford University.[102] Surgeons removed much of his large intestine, but found other problems, including severe atherosclerosis in one of his arteries.[103] He died in Palo Alto Hospital on August 27, 1958.[104] Molly did not want a public funeral but agreed to a memorial service at the First Congregationalist Church in Berkeley. University of California President Clark Kerr delivered the eulogy.[103]

Just 23 days after his death, the Regents of the University of California voted to rename two of the university's nuclear research sites after Lawrence: the Lawrence Livermore National Laboratory and the Lawrence Berkeley National Laboratory.[105] The Ernest Orlando Lawrence Award was established in his memory in 1959.[106] Chemical element number 103, discovered at the Lawrence Berkeley National Laboratory in 1961, was named lawrencium after him.[107] In 1968 the Lawrence Hall of Science public science education center was established in his honor.[108] His papers are in the Bancroft Library at the University of California in Berkeley.[109]

In the 1980s, Lawrence's widow petitioned the University of California Board of Regents on several occasions to remove her husband's name from the Livermore Laboratory, due to its focus on nuclear weapons Lawrence helped build, but was denied each time.[110][111][112][113] She outlived her husband by more than 44 years and died in Walnut Creek, California, at the age of 92 on January 6, 2003.[16][17]

George B. Kauffman wrote that:

Before him, "little science" was carried out largely by lone individuals working with modest means on a small scale. After him, massive industrial, and especially governmental, expenditures of manpower and monetary funding made "big science," carried out by large-scale research teams, a major segment of the national economy.[114]

Notes

  1. ^ Childs 1968, pp. 23–30.
  2. ^ Childs 1968, pp. 47–49.
  3. ^ Childs 1968, p. 61.
  4. ^ Childs 1968, pp. 63–68.
  5. ^ "Inventor of cyclotron dies after surgery". Eugene Register-Guard. Associated Press. August 28, 1958. p. 5b. Retrieved May 24, 2015.
  6. ^ Berdahl, Robert M. (December 10, 2001). "The Lawrence Legacy". Vermillion, South Dakota: University of California, Berkeley. Office of the Chancellor. Retrieved May 9, 2014.
  7. ^ a b Alvarez 1970, pp. 253–254.
  8. ^ Alvarez 1970, p. 288.
  9. ^ Lawrence, Ernest Orlando (August 1925). "The photoelectric effect in potassium vapour as a function of the frequency of the light". Philosophical Magazine. 50 (296): 345–359. doi:10.1080/14786442508634745.
  10. ^ Childs 1968, p. 93.
  11. ^ Alvarez 1970, p. 256.
  12. ^ Childs 1968, pp. 107–108.
  13. ^ Childs 1968, pp. 120–121.
  14. ^ Childs 1968, p. 256.
  15. ^ Brechin 1999, p. 312.
  16. ^ a b c Yarris, Lynn (January 8, 2003). "Lab mourns death of Molly Lawrence, widow of Ernest O. Lawrence". Lawrence Berkeley National Laboratory. Retrieved May 9, 2014.
  17. ^ a b "Obituaries: Mary Lawrence". The Berkleyan. University of California. January 15, 2003. Retrieved May 9, 2014.
  18. ^ a b Alvarez 1970, p. 259.
  19. ^ Childs 1968, p. 182.
  20. ^ a b Allen, John F. (August 29, 1958). "Cyclotron father's death mourned". Milwaukee Sentinel. p. 13, part 1.
  21. ^ Childs 1968, p. 309.
  22. ^ Herken 2002, pp. 11–15.
  23. ^ a b Kiessling, E.C. (December 17, 1968). "Even geniuses have human frailties". Milwaukee Journal. p. 24, part 1.
  24. ^ "The Nobel Prize in Chemistry 1951". Nobel Foundation. 2014. Retrieved 21 June 2015.
  25. ^ Widerøe, R. (December 17, 1928). "Ueber Ein Neues Prinzip Zur Herstellung Hoher Spannungen". Archiv für Elektronik und Übertragungstechnik (in German). 21 (4): 387.
  26. ^ "Breaking Through: A Century of Physics at Berkeley. 2. The Cyclotron". Bancroft Library, UC Berkeley. February 25, 2012. Archived from the original on February 25, 2012.
  27. ^ Heilbron & Seidel 1989, pp. 75–82.
  28. ^ Heilbron & Seidel 1989, pp. 46–49.
  29. ^ Heilbron & Seidel 1989, pp. 83–88.
  30. ^ "Remembering E. O. Lawrence". Science & Technology Review. Lawrence Livermore Laboratory. October 2001. Retrieved August 25, 2013.
  31. ^ Heilbron & Seidel 1989, pp. 89–95.
  32. ^ Heilbron & Seidel 1989, pp. 95–100.
  33. ^ Herken 2002, pp. 5–7.
  34. ^ "The Rad Lab – Ernest Lawrence and the Cyclotron". American Institute of Physics. Retrieved September 22, 2013.
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  38. ^ Heilbron & Seidel 1989, pp. 27–28.
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  81. ^ https://www2.lbl.gov/Science-Articles/Archive/early-years.html
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  95. ^ Heilbron, J. L.; Seidel, Robert W.; Wheaton, Bruce R. (1981). "Chapter 6: A Neutron Foundry". Lawrence and His Laboratory – A historian's view of the Lawrence year. Lawrence Berkeley National Laboratory. Retrieved October 5, 2013.
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  100. ^ Childs 1968, pp. 517–518.
  101. ^ Greene 2007, pp. 156–158, 289.
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  105. ^ "Photo of the Week: Inside the 60-Inch Cyclotron". United States Department of Energy. Retrieved August 24, 2013.
  106. ^ "Ernest Orlando Lawrence Award". United States Department of Energy. Retrieved August 24, 2013.
  107. ^ "100 Years of Scholarship". Cal Alumni. Retrieved August 24, 2013.
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  109. ^ "Guide to the Ernest O. Lawrence Papers". Online Archive of California. Retrieved May 24, 2015.
  110. ^ "University rejects widow's request". Ocala Star-Banner. Ocala, FL. Associated Press. July 16, 1983. p. 15A. Retrieved May 24, 2015.
  111. ^ Savage, David G. (September 7, 1985). "Physicist's widow asks that husband's name be removed from weapons lab". Los Angeles Times. Archived from the original on January 18, 2015. Retrieved May 9, 2014.
  112. ^ Lawrence, Mary B. (October 1986). "So they say:". The Scientist. excerpts. Retrieved May 9, 2014.
  113. ^ "Name change". Milwaukee Journal. Associated Press. June 8, 1987. p. 2A. Retrieved May 24, 2015.
  114. ^ Kauffman, George B. (February 2000). "Lawrence, Ernest Orlando". American National Biography Online. Retrieved June 22, 2015.

References

External links

Awards
Preceded by
none
Sylvanus Thayer Award
1958
Succeeded by
John Foster Dulles
Bevan Lawrence

Bevan Ernest Lawrence, a retired Western Australian barrister and political campaigner, is the older brother of Carmen Lawrence, a former premier of Western Australia. In the 1980s he was a convenor of two notable lobby groups that influenced the course of government at federal and state levels.

Cyclotron

A cyclotron is a type of particle accelerator invented by Ernest O. Lawrence in 1929–1930 at the University of California, Berkeley, and patented in 1932. A cyclotron accelerates charged particles outwards from the center along a spiral path. The particles are held to a spiral trajectory by a static magnetic field and accelerated by a rapidly varying (radio frequency) electric field. Lawrence was awarded the 1939 Nobel prize in physics for this invention.Cyclotrons were the most powerful particle accelerator technology until the 1950s when they were superseded by the synchrotron, and are still used to produce particle beams in physics and nuclear medicine. The largest single-magnet cyclotron was the 4.67 m (184 in) synchrocyclotron built between 1940 and 1946 by Lawrence at the University of California, Berkeley, which could accelerate protons to 730 million electron volts (MeV). The largest cyclotron is the 17.1 m (56 ft) multimagnet TRIUMF accelerator at the University of British Columbia in Vancouver, British Columbia which can produce 500 MeV protons.

Over 1200 cyclotrons are used in nuclear medicine worldwide for the production of radionuclides.

Ernest Thayer

Ernest Lawrence Thayer (; August 14, 1863 – August 21, 1940) was an American writer and poet who wrote the poem "Casey" (or "Casey at the Bat"), which is "the single most famous baseball poem ever written" according to the Baseball Almanac, and "the nation’s best-known piece of comic verse—a ballad that began a native legend as colorful and permanent as that of Johnny Appleseed or Paul Bunyan."

Ernie Eves

Ernest Larry Eves, (born June 17, 1946) is a Canadian lawyer and former politician who served as the 23rd Premier of Ontario from 2002 to 2003. He took over as Premier in 2002 when Mike Harris resigned as leader, but his party was defeated in the 2003 election by the Liberals, under Dalton McGuinty.

Eves was born in Windsor, Ontario, to a working-class family. He studied law at Osgoode Hall Law School and practised law in his own firm, named Green & Eves. He was elected in the northern Ontario riding of Parry Sound in 1981 by a margin of six votes but retained the seat for 20 years. He served briefly as a cabinet minister in the short-lived government of Frank Miller in 1985, but he was consigned to the opposition benches when the Tories were defeated in a motion of no confidence by an alliance of the opposition Liberal and New Democrats. He remained in opposition until 1995, when the Tories returned to power under Mike Harris, who appointed Eves as his Deputy Premier and Minister of Finance. Family tragedy and marital problems led to his resignation from the legislature in 2001.

After a brief return to the private sector, Eves returned to politics when Harris resigned in 2002. He won the party leadership and regained a seat in the legislature after winning a by-election in the central Ontario riding of Dufferin—Peel—Wellington—Grey. His tenure as premier was short, as his party was defeated 16 months later in the 2003 election, which saw the PC party lose 35 of its 59 seats. He resigned as leader in 2004 and retired from the legislature on January 31, 2005.

In 2007, Eves was appointed as Chairman of Jacob Securities Inc., a Toronto-based financial services company. He served in that position until July 2012.

Ernie Fields

Ernest Lawrence "Ernie" Fields (August 28, 1904 – May 11, 1997) was an African-American trombonist, pianist, arranger and bandleader. He first became known for leading the Royal Entertainers, which were based in Tulsa, Oklahoma, and toured along a circuit stretching from Kansas City, Kansas, to Dallas, Texas. In later years he led a band that recorded in Los Angeles.

Ernie Steeves

Ernest Lawrence Steeves (born February 12, 1961 in Fredericton, New Brunswick) is a Canadian politician, who was elected to the Legislative Assembly of New Brunswick in the 2014 provincial election. He represents the electoral district of Moncton Northwest as a member of the Progressive Conservatives. Ernie Steeves is a former Radio Broadcaster who has worked on air at: CFQM-FM (1982-1984), CHAM-AM, CKCW-AM, CFDR-AM, and CJMO-FM.

John Backus (acoustician)

John Graham Backus (April 29, 1911 – October 28, 1988) was an American physicist and acoustician.

John Backus was born and raised in Portland, Oregon, where he studied at Reed College, receiving a BA in 1932. He went on to graduate studies at the University of California, Berkeley, where he did research in nuclear physics at the Radiation Laboratory under Ernest Lawrence. He received an MA in 1936, and a PhD in 1940. In 1945 he was appointed Professor of Physics at the University of Southern California, a post he retained until his retirement in 1980. During the early part of his career, his research focussed on gaseous discharges in strong magnetic fields. He was also a musician, trained as a performer on piano, bassoon, clarinet and other woodwinds and received the degree of MMus in conducting from the University of Southern California in 1959. In his later career he turned increasingly to the study of musical acoustics, particularly those of wind instruments and organ pipes. In 1969 he published The Acoustical Foundations of Music, a book which became a standard text for introductory courses in musical acoustics. A second edition appeared in 1977. He received the Silver Medal of the Acoustical Society of America in 1986. Backus died in Los Angeles in 1988.

John Backus was a Renaissance man who in addition to music and physics was a highly skilled mountaineer. The Sierra Club's Hundred Peaks Section List contains approximately 275 summits, and John was the first person to ascend every mountain on the list six times. He was also the first person to lead every peak on the list, among his many hiking and climbing accomplishments.

Kenneth Ross MacKenzie

Kenneth Ross MacKenzie (June 15, 1912 – July 4, 2002) together with Dale R. Corson and Emilio Segrè, synthesized the element astatine, in 1940. MacKenzie received his PhD under Ernest Lawrence at Lawrence Livermore National Laboratory. Lawrence, MacKenzie, and their colleagues devised the first cyclotron. He was a professor of physics at UCLA, where he and Reg Richardson built UCLA's first cyclotron and later a bevatron. MacKenzie devised MacKenzie buckets which are plasma sources created by lining vacuum chamber walls with permanent magnets of alternating polarity to suppress plasma electron losses, that are widely used to this day. He later traveled around the world, helping to troubleshoot various country's cyclotron problems. Later in life, he studied plasma physics and dark matter.

As an actor, he played minor roles with Yvonne De Carlo in Ride the Pink Horse (1947), River Lady (1948) and Black Bart (1948).He died in Los Angeles on 4 July 2002 at aged 90.

Lawrence (crater)

Lawrence is a lunar impact crater that is located on a section of terrain to the east of Mare Tranquillitatis and northwest of Mare Fecunditatis. It was named after American physicist and Nobel laureate Ernest Lawrence and American astronaut Robert Henry Lawrence, Jr.. To the southeast is the larger crater Taruntius. The rille designated Rima Cauchy crosses the eastern part of the Mare Tranquillitatis and reaches as far as the northern rim of Lawrence.

This crater has been flooded by lava, leaving only a shallow ring of a rim projecting above the surface. The rim has breaks in the north and southwest, with the most intact portion in the east.

This crater was previously designated Taruntius M.

Lawrence Berkeley National Laboratory

Lawrence Berkeley National Laboratory (LBNL), commonly referred to as Berkeley Lab, is a United States national laboratory that conducts scientific research on behalf of the United States Department of Energy (DOE). It is located in the Berkeley Hills near Berkeley, California, overlooking the main campus of the University of California, Berkeley. It is managed and operated by the University of California.

Lawrence Livermore National Laboratory

Lawrence Livermore National Laboratory (LLNL) is a federal research facility in Livermore, California, United States, founded by the University of California, Berkeley in 1952. A Federally Funded Research and Development Center (FFRDC), it is primarily funded by the U.S. Department of Energy (DOE) and managed and operated by Lawrence Livermore National Security, LLC (LLNS), a partnership of the University of California, Bechtel, BWX Technologies, AECOM, and Battelle Memorial Institute in affiliation with the Texas A&M University System. In 2012, the laboratory had the synthetic chemical element livermorium named after it.

Lawrencium

Lawrencium is a synthetic chemical element with the symbol Lr (formerly Lw) and atomic number 103. It is named in honor of Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements. A radioactive metal, lawrencium is the eleventh transuranic element and is also the final member of the actinide series. Like all elements with atomic number over 100, lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Twelve isotopes of lawrencium are currently known; the most stable is 266Lr with a half-life of 11 hours, but the shorter-lived 260Lr (half-life 2.7 minutes) is most commonly used in chemistry because it can be produced on a larger scale.

Chemistry experiments have confirmed that lawrencium behaves as a heavier homolog to lutetium in the periodic table, and is a trivalent element. It thus could also be classified as the first of the 7th-period transition metals: however, its electron configuration is anomalous for its position in the periodic table, having an s2p configuration instead of the s2d configuration of its homolog lutetium. This means that lawrencium may be more volatile than expected for its position in the periodic table and have a volatility comparable to that of lead.

In the 1950s, 1960s, and 1970s, many claims of the synthesis of lawrencium of varying quality were made from laboratories in the Soviet Union and the United States. The priority of the discovery and therefore the naming of the element was disputed between Soviet and American scientists, and while the International Union of Pure and Applied Chemistry (IUPAC) initially established lawrencium as the official name for the element and gave the American team credit for the discovery, this was reevaluated in 1997, giving both teams shared credit for the discovery but not changing the element's name.

LeConte Hall

LeConte Hall is a building on the campus of the University of California, Berkeley. It is home to the physics department. LeConte Hall was one of the largest physics buildings in the world at the time it was opened in 1924, and was also the site of the first atom collider, built by Ernest O. Lawrence in 1931. The building was named in honor of the brothers Joseph and John LeConte, professors of Physics and Geology, who were respectively the first and third presidents of UC Berkeley.In 2004, LeConte Hall was named to the National Register of Historic Places.

Livermorium

Livermorium is a synthetic chemical element with the symbol Lv and has an atomic number of 116. It is an extremely radioactive element that has only been created in the laboratory and has not been observed in nature. The element is named after the Lawrence Livermore National Laboratory in the United States, which collaborated with the Joint Institute for Nuclear Research (JINR) in Dubna, Russia to discover livermorium during experiments made between 2000 and 2006. The name of the laboratory refers to the city of Livermore, California where it is located, which in turn was named after the rancher and landowner Robert Livermore. The name was adopted by IUPAC on May 30, 2012. Four isotopes of livermorium are known, with mass numbers between 290 and 293 inclusive; the longest-lived among them is livermorium-293 with a half-life of about 60 milliseconds. A fifth possible isotope with mass number 294 has been reported but not yet confirmed.

In the periodic table, it is a p-block transactinide element. It is a member of the 7th period and is placed in group 16 as the heaviest chalcogen, although it has not been confirmed to behave as the heavier homologue to the chalcogen polonium. Livermorium is calculated to have some similar properties to its lighter homologues (oxygen, sulfur, selenium, tellurium, and polonium), and be a post-transition metal, although it should also show several major differences from them.

Luis Walter Alvarez

Luis Walter Alvarez (June 13, 1911 – September 1, 1988) was an American experimental physicist, inventor, and professor who was awarded the Nobel Prize in Physics in 1968. The American Journal of Physics commented, "Luis Alvarez was one of the most brilliant and productive experimental physicists of the twentieth century."After receiving his PhD from the University of Chicago in 1936, Alvarez went to work for Ernest Lawrence at the Radiation Laboratory at the University of California in Berkeley. Alvarez devised a set of experiments to observe K-electron capture in radioactive nuclei, predicted by the beta decay theory but never before observed. He produced tritium using the cyclotron and measured its lifetime. In collaboration with Felix Bloch, he measured the magnetic moment of the neutron.

In 1940 Alvarez joined the MIT Radiation Laboratory, where he contributed to a number of World War II radar projects, from early improvements to Identification friend or foe (IFF) radar beacons, now called transponders, to a system known as VIXEN for preventing enemy submarines from realizing that they had been found by the new airborne microwave radars. Enemy submarines would wait until the radar signal was getting strong and then submerge, escaping attack. But VIXEN transmitted a radar signal whose strength was the cube of the distance to the submarine so that as they approached the sub, the signal—as measured by the sub—got progressively weaker, and the sub assumed the plane was getting farther away and didn't submerge. The radar system for which Alvarez is best known and which has played a major role in aviation, most particularly in the post war Berlin airlift, was Ground Controlled Approach (GCA). Alvarez spent a few months at the University of Chicago working on nuclear reactors for Enrico Fermi before coming to Los Alamos to work for Robert Oppenheimer on the Manhattan project. Alvarez worked on the design of explosive lenses, and the development of exploding-bridgewire detonators. As a member of Project Alberta, he observed the Trinity nuclear test from a B-29 Superfortress, and later the bombing of Hiroshima from the B-29 The Great Artiste.

After the war Alvarez was involved in the design of a liquid hydrogen bubble chamber that allowed his team to take millions of photographs of particle interactions, develop complex computer systems to measure and analyze these interactions, and discover entire families of new particles and resonance states. This work resulted in his being awarded the Nobel Prize in 1968. He was involved in a project to x-ray the Egyptian pyramids to search for unknown chambers. With his son, geologist Walter Alvarez, he developed the Alvarez hypothesis which proposes that the extinction event that wiped out the dinosaurs was the result of an asteroid impact.

Alvarez was a member of the JASON Defense Advisory Group, the Bohemian Club, and the Republican Party. Alvarez was the doctoral advisor of astrophysicist Richard Muller.

M. Stanley Livingston

Milton Stanley Livingston (May 25, 1905 – August 25, 1986) was an American accelerator physicist, co-inventor of the cyclotron with Ernest Lawrence, and co-discoverer with Ernest Courant and Hartland Snyder of the strong focusing principle, which allowed development of modern large-scale particle accelerators. He built cyclotrons at the University of California, Cornell University and the Massachusetts Institute of Technology. During World War II, he served in the operations research group at the Office of Naval Research.

Livingston was the chairman of the Accelerator Project at Brookhaven National Laboratory, director of the Cambridge Electron Accelerator, a member of the National Academy of Sciences, a professor of physics at MIT, and a recipient of the Enrico Fermi Award from the United States Department of Energy. He was Associate Director of the National Accelerator Laboratory from 1967 to 1970.

Particle accelerator

A particle accelerator is a machine that uses electromagnetic fields to propel charged particles to very high speeds and energies, and to contain them in well-defined beams.Large accelerators are used for basic research in particle physics. The most powerful accelerator currently is the Large Hadron Collider (LHC) near Geneva, Switzerland, built by the European collaboration CERN. It is a collider accelerator, which can accelerate two beams of protons to an energy of 6.5 TeV and cause them to collide head-on, creating center-of-mass energies of 13 TeV. Other powerful accelerators are KEKB at KEK in Japan, RHIC at Brookhaven National Laboratory, and the Tevatron at Fermilab, Batavia, Illinois. Accelerators are also used as synchrotron light sources for the study of condensed matter physics. Smaller particle accelerators are used in a wide variety of applications, including particle therapy for oncological purposes, radioisotope production for medical diagnostics, ion implanters for manufacture of semiconductors, and accelerator mass spectrometers for measurements of rare isotopes such as radiocarbon. There are currently more than 30,000 accelerators in operation around the world.There are two basic classes of accelerators: electrostatic and electrodynamic (or electromagnetic) accelerators.

Electrostatic accelerators use static electric fields to accelerate particles. The most common types are the Cockcroft–Walton generator and the Van de Graaff generator. A small-scale example of this class is the cathode ray tube in an ordinary old television set. The achievable kinetic energy for particles in these devices is determined by the accelerating voltage, which is limited by electrical breakdown.

Electrodynamic or electromagnetic accelerators, on the other hand, use changing electromagnetic fields (either magnetic induction or oscillating radio frequency fields) to accelerate particles.

Since in these types the particles can pass through the same accelerating field multiple times, the output energy is not limited by the strength of the accelerating field. This class, which was first developed in the 1920s, is the basis for most modern large-scale accelerators.

Rolf Widerøe, Gustav Ising, Leó Szilárd, Max Steenbeck, and Ernest Lawrence are considered pioneers of this field, conceiving and building the first operational linear particle accelerator, the betatron, and the cyclotron.

Because colliders can give evidence of the structure of the subatomic world, accelerators were commonly referred to as atom smashers in the 20th century. Despite the fact that most accelerators (but not ion facilities) actually propel subatomic particles, the term persists in popular usage when referring to particle accelerators in general.

Robert R. Wilson

Robert Rathbun Wilson (March 4, 1914 – January 16, 2000) was an American physicist known for his work on the Manhattan Project during World War II, as a sculptor, and as an architect of the Fermi National Accelerator Laboratory (Fermilab), where he was the first director from 1967 to 1978.

A graduate of the University of California, Berkeley (BA and PhD), Wilson received his doctorate under the supervision of Ernest Lawrence for his work on the development of the cyclotron at the Berkeley Radiation Laboratory. He subsequently went to Princeton University to work with Henry DeWolf Smyth on electromagnetic separation of the isotopes of uranium. In 1943, Wilson and many of his colleagues joined the Manhattan Project's Los Alamos Laboratory, where Wilson became the head of its Cyclotron Group (R-1), and later its Research (R) Division.

After the war, Wilson briefly joined the faculty of Harvard University as an associate professor, then went to Cornell University as professor of physics and the director of its new Laboratory of Nuclear Studies. Wilson and his Cornell colleagues constructed four electron synchrotrons. In 1967 he assumed directorship of the National Accelerator Laboratory, subsequently known as the Fermilab. He managed to complete the facility on time and under budget, but at the same time made it aesthetically pleasing, with a main administrative building purposely reminiscent of the Beauvais Cathedral, and a restored prairie with a herd of American Bison. He resigned in 1978 in a protest against inadequate government funding.

University of South Dakota

The University of South Dakota (or informally USD) is a public coeducational research (R2) university in Vermillion, South Dakota. Established by the Dakota Territory legislature in 1862, 27 years before the establishment of the state of South Dakota, USD is the flagship university for the state of South Dakota and the state's oldest public university.

On a 274 acres (1.11 km2) campus, USD is in southeastern South Dakota, approximately 63 miles (101 km) southwest of Sioux Falls, 39 miles (63 km) northwest of Sioux City, Iowa, and north of the Missouri River.

The university is home to South Dakota's only medical school and law school. It is also home to the National Music Museum, with over 15,000 American, European, and non-Western instruments. USD is governed by the South Dakota Board of Regents, and its president is Sheila Gestring. The university has been accredited by the North Central Association of College and Schools since 1913.

University of South Dakota's alumni include a total of 17 Truman Scholars, 12 Rhodes Scholars, and 1 Nobel Laureate, (Ernest Lawrence '22, 1939 Nobel Prize in Physics.) The athletic teams compete in the NCAA's Division I as members of The Summit League, except football, which competes in the Missouri Valley Football Conference.

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