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Timeline of nuclear fusion
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<h2 id="1920s">1920s</h2> <ul><li>1920 <ul><li>Based on <a href="/facts/F.W._Aston/DVoj9ebB">F.W. Aston's</a> measurements of the masses of low-mass elements and <a href="/facts/Albert_Einstein/CNTet8qu">Einstein's</a> discovery that E = m c 2 {\displaystyle E=mc^{2}} , <a href="/facts/Arthur_Eddington/b0jPBaSA">Arthur Eddington</a> proposes that large amounts of energy released by <a href="/facts/Nuclear_fusion/hP0gLDqj">fusing</a> small nuclei together provides the energy source that powers the stars.<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a></li> <li><a href="/facts/Henry_Norris_Russell/wWtTfeGG">Henry Norris Russell</a> notes that the relationship in the <a href="/facts/Hertzsprung%25E2%2580%2593Russell_diagram/53YWnCvR">Hertzsprung–Russell diagram</a> suggests a hot core rather than burning throughout the star. Eddington uses this to calculate that the core would have to be about 40 million Kelvin. This was a matter of some debate at the time, because the value is much higher than what observations suggest, which is about one-third to one-half that value.</li></ul></li> <li>1928 <ul><li><a href="/facts/George_Gamow/n79Pqk8R">George Gamow</a> introduces the mathematical basis for <a href="/facts/Quantum_tunnelling/WU4NMrKx">quantum tunnelling</a>.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a></li></ul></li> <li>1929 <ul><li><a href="/facts/Robert_d%2527Escourt_Atkinson/ChsEhF4S">Atkinson</a> and <a href="/facts/Fritz_Houtermans/vqrWVMCk">Houtermans</a> provide the first calculations of the rate of nuclear fusion in stars. Based on Gamow's tunnelling, they show fusion can occur at lower energies than previously believed. When used with Eddington's calculations of the required fusion rates in stars, their calculations demonstrate this would occur at the lower temperatures that Eddington had calculated.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a></li></ul></li></ul> <h2 id="1930s">1930s</h2> <ul><li>1932 <ul><li><a href="/facts/Ernest_Rutherford/hjjMEskl">Ernest Rutherford</a>'s <a href="/facts/Cavendish_Laboratory/nh4qJsWs">Cavendish Laboratory</a> at <a href="/facts/Cambridge_University/0la7aX9o">Cambridge University</a> begins nuclear experiments with a <a href="/facts/Particle_accelerator/Pkuc08xC">particle accelerator</a> built by <a href="/facts/John_Cockcroft/Is5qGyKV">John Cockcroft</a> and <a href="/facts/Ernest_Walton/97mCDtyU">Ernest Walton</a>.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a></li> <li>In April, Walton produces the first man-made <a href="/facts/Nuclear_disintegration/Ya6FVjt4">nuclear disintegration</a> by using <a href="/facts/Proton/clCjepXP">protons</a> from the accelerator to split <a href="/facts/Lithium/7vXX6BWA">lithium</a> into <a href="/facts/Alpha_particle/dzNMs9WP">alpha particles</a>. They discover the intermediary creation of the extremely short-lived <a href="/facts/Beryllium-8/I8e5Isl0">beryllium-8</a> isotope. This could be considered the first artificial fusion.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a></li></ul></li> <li>1934 <ul><li>Using an updated version of the equipment firing deuterium rather than hydrogen, <a href="/facts/Mark_Oliphant/m16yXrf4">Mark Oliphant</a> discovered <a href="/facts/Helium-3/SmPC5oT3">helium-3</a> and <a href="/facts/Tritium/HWSa6EHy">tritium</a>, and that heavy <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a> nuclei could be made to react with each other. This is considered the first artificial fusion.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a></li></ul></li> <li>1937 <ul><li><a href="/facts/George_Gamow/n79Pqk8R">George Gamow</a> and <a href="/facts/Carl_Friedrich_von_Weizs%25C3%25A4cker/HJFv48U0">Carl Friedrich von Weizsäcker</a> suggest <a href="/facts/Diproton/bEoG4I7n">proton combination into deuterium</a> may be the source of stellar energy.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a></li></ul></li> <li>1938 <ul><li>In March, <a href="/facts/Hans_Bethe/X6bkxRRI">Hans Bethe</a> attends the <a href="/facts/Carnegie_Institution_for_Science/zS5MqNUP">Carnegie Institute</a> and <a href="/facts/George_Washington_University/RBAg9f0r">George Washington University</a>'s fourth annual <a href="/facts/Washington_Conference_on_Theoretical_Physics/PUND3zu9">Washington Conference on Theoretical Physics</a> on <a href="/facts/Edward_Teller/9g3Mr9Mp">Edward Teller</a>'s insistence. He works with <a href="/facts/Charles_Critchfield/tsHGYm3A">Charles Critchfield</a> to derive stellar nuclear reactions beyond the proton combination into deuterium. They publish two reactions based on the incorrect assumption tritium is more stable, and four reactions based on the correct assumption helium-3 is more stable, thereby discovering the <a href="/facts/Proton%25E2%2580%2593proton_chain/UUDAR9yW">proton–proton chain</a>.<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a></li> <li>Kantrowitz and Jacobs of the <a href="/facts/NACA/xI8P4jTr">NACA</a> <a href="/facts/Langley_Research_Center/UrNAPV7g">Langley Research Center</a> built a toroidal <a href="/facts/Magnetic_bottle/j2BymN1Q">magnetic bottle</a> and heat the plasma with a 150 W radio source. Hoping to heat the plasma to millions of degrees, the system fails and they are forced to abandon their <a href="/facts/Diffusion_Inhibitor/oegcBPSb">Diffusion Inhibitor</a>.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> This is the first attempt to make a working fusion reactor.</li></ul></li> <li>1939 <ul><li><a href="/facts/Peter_Thonemann_(physicist)/QMnsSfVK">Peter Thonemann</a> develops a detailed plan for a <a href="/facts/Pinch_(plasma_physics)/RwAlcMDs">pinch</a> device, but is told to do other work for his thesis.<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a></li> <li><a href="/facts/Hans_Bethe/X6bkxRRI">Hans Bethe</a> publishes the discovery of the <a href="/facts/CNO_cycle/ClM5eAGc">carbon-nitrogen-oxygen cycle</a> in higher mass stars.<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> Along with the proton-proton chain, this work results in the 1967 <a href="/facts/Nobel_Prize_for_Physics/o6w1nCbr">Nobel Prize for Physics</a>.<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a></li></ul></li></ul> <h2 id="1940s">1940s</h2> <ul><li>1945 <ul><li>The <a href="/facts/Smyth_Report/VhoG5wL6">Smyth Report</a>, detailing the history of fission research and the <a href="/facts/Manhattan_Project/gtg8yRK2">Manhattan Project</a>, briefly refers to Bethe's discovery of the <a href="/facts/CNO_cycle/ClM5eAGc">CNO cycle</a> and the eventual possibility of laboratory fusion, without using the word "fusion".<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a></li></ul></li> <li>1946 <ul><li><a href="/facts/George_Paget_Thomson/Mmk3oA0A">George Paget Thomson</a> of <a href="/facts/Imperial_College%2c_London/SoXBRyax">Imperial College, London</a> designs the <a href="/facts/Toroidal_solenoid/E7ltCdLN">toroidal solenoid</a>, a simple fusion device. With <a href="/facts/Moses_Blackman/5hffeJf0">Moses Blackman</a>, he further develops the concept and files for a patent. This becomes the first fusion device to receive a patent.<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a> Repeated attempts to get development funding fail.</li></ul></li> <li>1947 <ul><li>A meeting at <a href="/facts/Atomic_Energy_Research_Establishment/4UMoNfcP">Harwell</a> on the topic of fusion raises new concerns with the concept. On his return to London, Thomson gets graduate students <a href="/facts/James_L._Tuck/QSMpJokw">James L. Tuck</a> and Alan Alfred Ware to build a prototype device out of old radar parts.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a></li> <li><a href="/facts/Peter_Thonemann/QMnsSfVK">Peter Thonemann</a> comes up with a similar idea, but uses a different method of heating the fuel. This seems much more practical and finally gains the mild interest of the UK nuclear establishment. Not aware of who he is talking to, Thonemann describes the concept to Thomson, who adopts the same concept.<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a></li> <li><a href="/facts/Herbert_Wakefield_Banks_Skinner/ASfHmGsE">Herbert Skinner</a> begins to write a lengthy report on the entire fusion concept, pointing out several areas of little or no knowledge.<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a></li></ul></li> <li>1948 <ul><li>The <a href="/facts/Ministry_of_Supply/9SuX037b">Ministry of Supply</a> (MoS) asks Thomson about the status of his patent filing, and he describes the problems he has getting funding. The MoS forces Harwell to provide some money, and Thomson releases his rights to the patent. It is granted late that year.<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a></li> <li>Skinner publishes his report, calling for some experimental effort to explore the areas of concern. Along with the MoS's calls for funding of Thomson, this event marks the beginning of formal fusion research in the UK.<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a></li></ul></li></ul> <h2 id="1950s">1950s</h2> <ul><li>1950 <ul><li>In January, <a href="/facts/Klaus_Fuchs/7IUrcfMf">Klaus Fuchs</a> admits to passing nuclear secrets to the <a href="/facts/Soviet_Union/m7wWsPto">Soviet Union</a>. Almost all nuclear research in the UK, including the fledgling fusion program, is immediately classified. Thomson, until this time working at Imperial University, is moved to the <a href="/facts/Atomic_Weapons_Research_Establishment/t9elVa17">Atomic Weapons Research Establishment</a>.</li> <li>The <a href="/facts/Tokamak/kDtb8Bsw">tokamak</a>, a type of <a href="/facts/Magnetic_confinement_fusion/ThThVDpr">magnetic confinement fusion</a> device, was proposed by Soviet scientists <a href="/facts/Andrei_Sakharov/fryrhYEK">Andrei Sakharov</a> and <a href="/facts/Igor_Tamm/s3MDVyJj">Igor Tamm</a>.</li></ul></li> <li>1951 <ul><li><a href="/facts/Edward_Teller/9g3Mr9Mp">Edward Teller</a> and <a href="/facts/Stanislaw_Ulam/KaJPqENX">Stanislaw Ulam</a> at <a href="/facts/Los_Alamos_National_Laboratory/tlrLkV7r">Los Alamos National Laboratory</a> (LANL) develop the <a href="/facts/Teller-Ulam_design/T9zFe3H0">Teller-Ulam design</a> for the <a href="/facts/Thermonuclear_weapon/T9zFe3H0">thermonuclear weapon</a>, allowing for the development of multi-megaton weapons.</li> <li>A press release from <a href="/facts/Argentina/aFSA5bAk">Argentina</a> claims that their <a href="/facts/Huemul_Project/tu0ABfBx">Huemul Project</a> had produced controlled nuclear fusion. This prompted a wave of responses in other countries, especially the U.S. <ul><li><a href="/facts/Lyman_Spitzer/0pd1ge9R">Lyman Spitzer</a> dismisses the Argentinian claims, but while thinking about it comes up with the <a href="/facts/Stellarator/HXSJF0Cz">stellarator</a> concept. Funding is arranged under Project Matterhorn and develops into the <a href="/facts/Princeton_Plasma_Physics_Laboratory/YEBMkkow">Princeton Plasma Physics Laboratory</a>.</li> <li>Tuck introduces the British pinch work to LANL. He develops the <a href="/facts/Perhapsatron/ebe93G4Y">Perhapsatron</a> under the codename <a href="/facts/Project_Sherwood/q4yUvCUA">Project Sherwood</a>. The project name is a play on his name via Friar Tuck.<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a></li> <li><a href="/facts/Richard_F._Post/GzRm6Y9V">Richard F. Post</a> presents his <a href="/facts/Magnetic_mirror/j2BymN1Q">magnetic mirror</a> concept and also receives initial funding, eventually moving to <a href="/facts/Lawrence_Livermore_National_Laboratory/WuXIbIKz">Lawrence Livermore National Laboratory</a> (LLNL).</li> <li>In the UK, repeated requests for more funding that had previously been turned down are suddenly approved. Within a short time, three separate efforts are started, one at Harwell and two at <a href="/facts/Atomic_Weapons_Establishment/t9elVa17">Atomic Weapons Establishment</a> (Aldermaston). Early planning for a much larger machine at Harwell begins.</li> <li>Using the Huemul release as leverage, Soviet researchers find their funding proposals rapidly approved. Work on linear pinch machines begins that year.</li></ul></li> <li>On May 9, the American nuclear test <a href="/facts/Greenhouse_George/0hCFWth1">Greenhouse George</a>, the first of a <a href="/facts/Boosted_fission_weapon/U11GQ2mf">boosted fission weapon</a>, yields 255 kilotons from an <a href="/facts/Enriched_uranium/vSb2Tcsb">enriched uranium</a> core and <a href="/facts/Deuterium/Bv4wfCkw">deuterium</a>-<a href="/facts/Tritium/HWSa6EHy">tritium</a> gas. This is the artificial thermonuclear fusion, and the first weaponization of fusion energy.<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a></li> <li>Experimental research of toroidal magnetic confinement systems starts at the <a href="/facts/Kurchatov_Institute/lSkWUomv">Kurchatov Institute</a>, <a href="/facts/Moscow/AcFYpQUR">Moscow</a>, led by a group of Soviet scientists led by <a href="/facts/Lev_Artsimovich/cNXcKJ8S">Lev Artsimovich</a>. Device chambers are constructed from glass, porcelain, or metal. Their largest device, TMP, uses a porcelain chamber with metal spirals. Data is collected from the first operational toroidal magnetic plasma devices.<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a></li></ul></li></ul> <ul><li>1952 <ul><li>On November 1, the United States conducts the <a href="/facts/Ivy_Mike/yFqF9H72">Ivy Mike</a> shot of <a href="/facts/Operation_Ivy/kNxjprMr">Operation Ivy</a>, the first detonation of a <a href="/facts/Thermonuclear_weapon/T9zFe3H0">hydrogen bomb</a>, yields 10.4 megatons of TNT out of a fusion fuel of liquid deuterium.</li> <li>Cousins and Ware build a larger toroidal <a href="/facts/Pinch_(plasma_physics)/RwAlcMDs">pinch</a> device in England and demonstrated that the plasma in pinch devices is inherently unstable.</li></ul></li> <li>1953 <ul><li>The first Soviet fusion bomb test, <a href="/facts/RDS-6s/HjACuGdr">RDS-6s</a>, American codename "<a href="/facts/Joe_4/HjACuGdr">Joe 4</a>", demonstrated the first fission/fusion/fission "layercake" design, limited below the megaton range, with less than 20% of the yield coming directly from fusion. It was quickly superseded by the <a href="/facts/Teller-Ulam/T9zFe3H0">Teller-Ulam design</a>. This was the first aerial drop of a fusion weapon.</li> <li><a href="/facts/Z-pinch/x90DDvTn">Linear pinch devices</a> in the US and USSR report detections of <a href="/facts/Neutron/oRCM1geb">neutrons</a>, an indication of fusion reactions. Both are later explained as coming from instabilities in the fuel, and are non-fusion in nature.</li> <li>Scientists at the <a href="/facts/Princeton_Plasma_Physics_Laboratory/YEBMkkow">Princeton Plasma Physics Laboratory</a> construct Model A, the first operational stellarator.<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a></li></ul></li> <li>1954 <ul><li>Early planning for the large <a href="/facts/ZETA_(fusion_reactor)/lWpxEtI6">ZETA</a> device at Harwell begins. The name is a take-off on <a href="/facts/Research_reactor/lA2UNTuV">small experimental fission reactors</a> which often had "zero energy" in their name, <a href="/facts/ZEEP/WLwY7sRk">ZEEP</a> being an example.</li> <li><a href="/facts/Edward_Teller/9g3Mr9Mp">Edward Teller</a> gives a now-famous speech on plasma stability in magnetic bottles at the Princeton Gun Club. His work suggests that most magnetic bottles are inherently unstable, outlining what is today known as the <a href="/facts/Interchange_instability/sjVVgbSL">interchange instability</a>.</li></ul></li> <li>1955 <ul><li>At the first <a href="/facts/Atoms_for_Peace/6FHaXDkf">Atoms for Peace</a> meeting in Geneva, <a href="/facts/Homi_J._Bhabha/hVevadtA">Homi J. Bhabha</a> predicts that fusion will be in commercial use within two decades. This prompts a number of countries to begin fusion research; <a href="/facts/Japan/U5mz0SRT">Japan</a>, <a href="/facts/France/CxIeIKM3">France</a> and <a href="/facts/Sweden/u3qC7lyj">Sweden</a> all start programs this year or the next.</li> <li>Scientists in the Soviet Union achieve the first fusion via a purely chemical explosive-driven implosion, using spherical shock waves to compress a UD 2 T {\displaystyle {\ce {UD2T}}} target.<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a></li></ul></li> <li>1956 <ul><li>Construction of ZETA begins at Harwell.</li> <li><a href="/facts/Igor_Kurchatov/4CpFvwoj">Igor Kurchatov</a> gives a talk at Harwell on pinch devices,<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> revealing for the first time that the USSR is also working on fusion. He details the problems they are seeing, mirroring those in the US and UK.</li> <li>In August, a number of articles on plasma physics appear in various Soviet journals.</li> <li>In the wake of the Kurchatov's speech, the US and UK begin to consider releasing their own data. Eventually, they settle on a release prior to the 2nd <a href="/facts/Atoms_for_Peace/6FHaXDkf">Atoms for Peace</a> conference in <a href="/facts/Geneva/14gXxjcq">Geneva</a> in 1958.</li> <li>On May 27, the United States conducts the Zuni test of <a href="/facts/Operation_Redwing/DVVSaYdI">Operation Redwing</a> with a <a href="/facts/B41_nuclear_bomb/bNSostjy">Mk-41 bomb</a>, the first test of a three-stage hydrogen bomb.</li></ul></li> <li>1957 <ul><li>In the US, at <a href="/facts/Los_Alamos_National_Laboratory/tlrLkV7r">LANL</a>, Scylla I<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> begins operation using the θ-pinch design.</li> <li>ZETA is completed in the summer, it will be the largest fusion machine for a decade.</li> <li>In August, initial results on ZETA appear to suggest the machine has successfully reached basic fusion temperatures. UK researchers start pressing for public release, while the US demurs.</li> <li>Scientists at the AEI Research laboratory in Harwell reported that the <a href="/facts/Sceptre_(fusion_reactor)/vGKXsIwD">Sceptre III</a> plasma column remained stable for 300 to 400 microseconds, a dramatic improvement on previous efforts. Working backward, the team calculated that the plasma had an electrical resistivity around 100 times that of copper, and was able to carry 200 kA of current for 500 microseconds in total.</li></ul></li> <li>1958 <ul><li>In January, the US and UK release large amounts of data, with the ZETA team claiming fusion. Other researchers, notably Artsimovich and Spitzer, are sceptical.</li> <li>In May, a series of new tests demonstrate the measurements on ZETA were erroneous, and the claims of fusion have to be retracted.</li> <li>American, British and <a href="/facts/USSR/m7wWsPto">Soviet</a> scientists began to share previously classified controlled fusion research as part of the <a href="/facts/Atoms_for_Peace/6FHaXDkf">Atoms for Peace</a> conference in <a href="/facts/Geneva/14gXxjcq">Geneva</a> in September. It is the largest international scientific meeting to date. It becomes clear that basic pinch concepts are not successful and that no device has yet created fusion at any level.</li> <li>Scylla demonstrates the first controlled thermonuclear fusion in any laboratory,<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a><a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a> although confirmation came too late to be announced at Geneva. This <a href="/facts/Theta_pinch/I2Kwr69L">θ-pinch</a> approach will ultimately be abandoned as calculations show it cannot scale up to produce a reactor.</li> <li>The <a href="/facts/Kurchatov_Institute/lSkWUomv">Kurchatov Institute</a> constructs its first toroidal device with an all-metal chamber, T-1, considered to be the first operational tokamak.<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a></li></ul></li></ul> <h2 id="1960s">1960s</h2> <ul><li>1960 <ul><li>After considering the concept for some time, <a href="/facts/John_Nuckolls/J1vfEbun">John Nuckolls</a> publishes the concept of <a href="/facts/Inertial_confinement_fusion/67Lyy7nb">inertial confinement fusion</a>. The <a href="/facts/Laser/jk6PTvvT">laser</a>, introduced the same year, appears to be a suitable "driver".</li></ul></li> <li>1961 <ul><li>The <a href="/facts/Soviet_Union/m7wWsPto">Soviet Union</a> test the <a href="/facts/Tsar_Bomba/qbjpPwN2">Tsar Bomba</a> (50 megatons), the most powerful <a href="/facts/Thermonuclear_weapon/T9zFe3H0">thermonuclear weapon</a> ever.</li></ul></li> <li>1964 <ul><li>Plasma temperatures of approximately 40 million degrees Celsius and a few billion deuteron-deuteron fusion reactions per discharge were achieved at <a href="/facts/Los_Alamos_National_Laboratory/tlrLkV7r">LANL</a> with the Scylla IV device.<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a></li></ul></li> <li>1965 <ul><li>At an international meeting at the UK's new fusion research centre in Culham, the Soviets release early results showing greatly improved performance in toroidal pinch machines. The announcement is met by scepticism, especially by the UK team who's ZETA was largely identical. Spitzer, chairing the meeting, essentially dismisses it out of hand.</li> <li>At the same meeting, odd results from the ZETA machine are published. It will be years before the significance of these results are realized.</li> <li>By the end of the meeting, it is clear that most fusion efforts have stalled. All of the major designs, including the <a href="/facts/Stellarator/HXSJF0Cz">stellarator</a>, pinch machines and <a href="/facts/Magnetic_mirror/j2BymN1Q">magnetic mirrors</a> are all losing plasma at rates that are simply too high to be useful in a reactor setting. Less-known designs like the levitron and <a href="/facts/Astron_(fusion_reactor)/tCfgc84G">astron</a> are faring no better.</li> <li>The 12-beam "4 pi laser" using ruby as the lasing medium is developed at <a href="/facts/Lawrence_Livermore_National_Laboratory/WuXIbIKz">Lawrence Livermore National Laboratory</a> (LLNL) includes a gas-filled target chamber of about 20 centimeters in diameter.</li></ul></li> <li>1967 <ul><li>Demonstration of <a href="/facts/Farnsworth-Hirsch_Fusor/JQBRLWwp">Farnsworth-Hirsch Fusor</a> appeared to generate neutrons in a nuclear reaction.</li> <li><a href="/facts/Hans_Bethe/X6bkxRRI">Hans Bethe</a> wins the 1967 <a href="/facts/Nobel_Prize_in_Physics/o6w1nCbr">Nobel Prize in Physics</a> for his publication on how fusion powers the stars in work of 1939.<a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a></li></ul></li> <li>1968 <ul><li><a href="/facts/Robert_L._Hirsch/FdnwMw1a">Robert L. Hirsch</a> is hired by <a href="/facts/Amasa_Bishop/WHKYwdLz">Amasa Bishop</a> of the <a href="/facts/United_States_Atomic_Energy_Commission/7VXrvVJ9">Atomic Energy Commission</a> as staff physicist. Hirsch would eventually end up running the fusion program during the 1970s.</li> <li>Further results from the T-3 <a href="/facts/Tokamak/kDtb8Bsw">tokamak</a>, similar to the toroidal pinch machine mentioned in 1965, claims temperatures to be over an order of magnitude higher than any other device. The Western scientists remain highly sceptical.</li> <li>The Soviets invite a UK team from ZETA to perform independent measurements on T-3.</li></ul></li> <li>1969 <ul><li>The UK team, nicknamed "The Culham Five", confirm the Soviet results early in the year. They publish their results in October's edition of <i>Nature</i>. This leads to a "veritable stampede" of tokamak construction around the world.</li> <li>After learning of the Culham Five's results in August, a furious debate breaks out in the US establishment over whether or not to build a tokamak. After initially pooh-poohing the concept, the Princeton group eventually decides to convert their stellarator to a tokamak.</li> <li>The <a href="/facts/Kurchatov_Institute/lSkWUomv">Kurchatov Institute</a> detects neutrons from deuterium plasma in their T-3A tokamak, marking the first fusion in a tokamak device.<a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a></li></ul></li></ul> <h2 id="1970s">1970s</h2> <ul><li>1970 <ul><li>Princeton's conversion of the <a href="/facts/Model_C_stellarator/TulLUdoP">Model C stellarator</a> to the Symmetrical Tokamak is completed, and tests match and then best the Soviet results. With an apparent solution to the magnetic bottle problem in-hand, plans begin for a larger machine to test the scaling and various methods to heat the plasma.</li> <li>Kapchinskii and Teplyakov introduce a <a href="/facts/Particle_accelerator/Pkuc08xC">particle accelerator</a> for heavy ions that appear suitable as an ICF driver in place of lasers.</li></ul></li> <li>1972 <ul><li>The first neodymium-<a href="/facts/Doping_(semiconductor)/WrGdtWnm">doped</a> glass (Nd:glass) laser for ICF research, the "<a href="/facts/Long_path_laser/FDgTj5cD">Long Path laser</a>" is completed at LLNL and is capable of delivering ~50 joules to a fusion target.</li></ul></li> <li>1973 <ul><li>Design work on <a href="/facts/Joint_European_Torus/faIvLnuY">JET</a>, the Joint European Torus, begins.</li> <li>The <a href="/facts/Kurchatov_Institute/lSkWUomv">Kurchatov Institute</a> begins development of T-8 and T-9, investing non-circular tokamak cross-sections such as the T-8's D-shaped design.<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a></li></ul></li> <li>1974 <ul><li><a href="/facts/John_Bryan_Taylor/hrU4u5Nj">J.B. Taylor</a> re-visited ZETA results of 1958 and explained that the quiet-period was in fact very interesting. This led to the development of <a href="/facts/Reversed_field_pinch/pdPXlE9g">reversed field pinch</a>, now generalised as "self-organising plasmas", an ongoing line of research.</li> <li><a href="/facts/KMS_Fusion/0KlyFq21">KMS Fusion</a>, a private-sector company, builds an ICF reactor using laser drivers. Despite limited resources and numerous business problems, KMS successfully compresses fuel in December 1973, and on 1 May 1974 successfully demonstrates the world's first laser-induced fusion. Neutron-sensitive nuclear emulsion detectors, developed by Nobel Prize winner <a href="/facts/Robert_Hofstadter/J3BhKUUb">Robert Hofstadter</a>, were used to provide evidence of this discovery.</li> <li>Beams using mature high-energy accelerator technology are hailed as the elusive "brand-X" driver capable of producing fusion implosions for commercial power. The Livingston Curve, which illustrates the improvement in power of <a href="/facts/Particle_accelerator/Pkuc08xC">particle accelerators</a> over time, is modified to show the energy needed for fusion to occur. Experiments commence on the single beam LLNL <a href="/facts/Cyclops_laser/vrfUJaCU">Cyclops laser</a>, testing new optical designs for future ICF lasers.</li></ul></li> <li>1975 <ul><li>The <a href="/facts/Princeton_Large_Torus/l6amJbMm">Princeton Large Torus</a> (PLT), the follow-on to the Symmetrical Tokamak, begins operation. It soon surpasses the best Soviet machines and sets several temperature records that are above what is needed for a commercial reactor. PLT continues to set records until it is decommissioned.</li></ul></li> <li>1976 <ul><li>Workshop, called by the US-ERDA (now DoE) at the Claremont Hotel in Berkeley, CA for an ad-hoc two-week summer study. Fifty senior scientists from the major US ICF programs and accelerator laboratories participated, with program heads and Nobel laureates also attending. In the closing address, Dr. C. Martin Stickley, then Director of US-ERDA's Office of Inertial Fusion, announced the conclusion was "no showstoppers" on the road to fusion energy.</li> <li>The two beam <a href="/facts/Argus_laser/WmjlmHVB">Argus laser</a> is completed at LLNL and experiments involving more advanced laser-target interactions commence.</li> <li>Based on the continued success of the PLT, the DOE selects a larger Princeton design for further development. Initially designed simply to test a commercial-sized tokamak, the DOE team instead gives them the explicit goal of running on a deuterium-tritium fuel as opposed to test fuels like hydrogen or deuterium. The project is given the name <a href="/facts/Tokamak_Fusion_Test_Reactor/FowURWWA">Tokamak Fusion Test Reactor</a> (TFTR).</li> <li>The <a href="/facts/Kurchatov_Institute/lSkWUomv">Kurchatov Institute</a> builds the TO-2, the first tokamak with a <a href="/facts/Divertor/P2xcFypT">divertor</a>, using a toroidal configuration which would soon be superseded by poloidal divertors.<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a></li></ul></li> <li>1977 <ul><li>The 20 beam <a href="/facts/Shiva_laser/hsdRMlJW">Shiva laser</a> at LLNL is completed, capable of delivering 10.2 kilojoules of infrared energy on target. At a price of $25 million and a size approaching that of a football field, the Shiva laser is the first of the "megalasers" at LLNL and brings the field of ICF research fully within the realm of "<a href="/facts/Big_science/zQQQhdro">big science</a>".</li> <li>The <a href="/facts/Joint_European_Torus/faIvLnuY">JET</a> project is given the go-ahead by the <a href="/facts/European_Commission/Cc5JgbEI">EC</a>, choosing the UK's center at Culham as its site.</li></ul></li></ul> <ul><li>1978 <ul><li>As PLT continues to set new records, Princeton is given additional funding to adapt TFTR with the explicit goal of reaching breakeven.</li> <li>The <a href="/facts/Kurchatov_Institute/lSkWUomv">Kurchatov Institute</a> builds the T-7, the first full-scale tokamak to use superconducting coils, using an NbTi {\displaystyle {\ce {NbTi}}} alloy.<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a><a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a></li></ul></li> <li>1979 <ul><li>LANL successfully demonstrates the radio frequency quadrupole accelerator (RFQ).</li> <li><a href="/facts/Argonne_National_Laboratory/EAoR1Rnm">ANL</a> and Hughes Research Laboratories demonstrate required ion source brightness with xenon beam at 1.5MeV.</li> <li>The Foster Panel report to US-DoE's Energy Research and advisory board on ICF concludes that <a href="/facts/Heavy_ion_fusion/WAMrxdu9">heavy ion fusion</a> (HIF) is the "conservative approach" to ICF. Listing HIF's advantages in his report, John Foster remarked: "...now that is kind of exciting." After DoE Office of Inertial Fusion completed review of programs, Director Gregory Canavan decides to accelerate the HIF effort.</li></ul></li></ul> <h2 id="1980s">1980s</h2> <ul><li>1980 <ul><li>Scientists in the Soviet Union report the first conical target fusion, produced by the impact of a metal projectile containing deuterium, accelerated by chemical explosives to 5.4 km/s.<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a></li></ul></li> <li>1982 <ul><li>HIBALL study by German and US institutions,<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a> Garching uses the high repetition rate of the RF accelerator driver to serve four reactor chambers and first-wall protection using liquid lithium inside the chamber cavity.</li> <li><a href="/facts/Tore_Supra/qk6noP8t">Tore Supra</a> construction starts at <a href="/facts/Cadarache/tAp2aLQH">Cadarache</a>, France. Its <a href="/facts/Superconductivity/pqQAlSzJ">superconducting</a> magnets will permit it to generate a strong permanent toroidal magnetic field.<a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a></li> <li><a href="/facts/High-confinement_mode/zrR5gh6Y">high-confinement mode</a> (H-mode) discovered in tokamaks.</li></ul></li> <li>1983 <ul><li><a href="/facts/Joint_European_Torus/faIvLnuY">Joint European Torus</a>, the largest operational magnetic confinement plasma physics experiment is completed on time and on budget. First plasmas achieved.</li> <li>The <a href="/facts/NOVETTE_laser/G7axAEpC">NOVETTE laser</a> at LLNL comes on line and is used as a test bed for the next generation of ICF lasers, specifically the <a href="/facts/NOVA_laser/JdLDKQ9A">NOVA laser</a>.</li></ul></li> <li>1984 <ul><li>The huge 10 beam <a href="/facts/NOVA_laser/JdLDKQ9A">NOVA laser</a> at LLNL is completed and switches on in December. NOVA would ultimately produce a maximum of 120 kilojoules of infrared laser light during a nanosecond pulse in a 1989 experiment.</li></ul></li> <li>1985 <ul><li>National Academy of Sciences reviewed military ICF programs, noting HIF's major advantages clearly but averring that HIF was "supported primarily by other [than military] programs". The review of ICF by the National Academy of Sciences marked the trend with the observation: "The energy crisis is dormant for the time being."<a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a> Energy becomes the sole purpose of heavy ion fusion.</li> <li>The Japanese tokamak, <a href="/facts/JT-60/BmWrcR3E">JT-60</a> completed. First plasmas achieved.</li></ul></li> <li>1988 <ul><li>The <a href="/facts/T-15_(reactor)/6MSENsBz">T-15</a>, Soviet tokamak with superconducting helium-cooled coils completed.</li> <li>The Conceptual Design Activity for the International Thermonuclear Experimental Reactor (<a href="/facts/ITER/SkpWL87b">ITER</a>), the successor to <a href="/facts/T-15_(reactor)/6MSENsBz">T-15</a>, <a href="/facts/TFTR/FowURWWA">TFTR</a>, <a href="/facts/Joint_European_Torus/faIvLnuY">JET</a> and <a href="/facts/JT-60/BmWrcR3E">JT-60</a>, begins.<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a> Participants include <a href="/facts/EURATOM/tYFVyafy">EURATOM</a>, Japan, the <a href="/facts/Soviet_Union/m7wWsPto">Soviet Union</a> and United States. It ended in 1990.</li> <li>The first plasma produced at <a href="/facts/Tore_Supra/qk6noP8t">Tore Supra</a> in April.<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a></li></ul></li> <li>1989 <ul><li>On March 23, two <a href="/facts/Utah/te7zUyBX">Utah</a> electrochemists, <a href="/facts/Stanley_Pons/xRakkINV">Stanley Pons</a> and <a href="/facts/Martin_Fleischmann/wRtHW5TS">Martin Fleischmann</a>, announced that they had achieved <a href="/facts/Cold_fusion/UCwaDp88">cold fusion</a>: fusion reactions which could occur at room temperatures. However, they made their announcements before any peer review of their work was performed, and no subsequent experiments by other researchers revealed any evidence of fusion.</li></ul></li></ul> <h2 id="1990s">1990s</h2> <ul><li>1990 <ul><li>Decision to construct the <a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a> "beamlet" laser at LLNL is made.</li></ul></li> <li>1991 <ul><li>The <a href="/facts/Small_Tight_Aspect_Ratio_Tokamak/DEXj9lbP">START</a> Tokamak fusion experiment begins in <a href="/facts/Culham/wqQKIL11">Culham</a>. The experiment would eventually achieve a record <a href="/facts/Fusion_power/jyETSzm4">beta</a> (plasma pressure compared to magnetic field pressure) of 40% using a <a href="/facts/Neutral_beam_injector/R8nwaIII">neutral beam injector</a>. It was the first design that adapted the conventional toroidal fusion experiments into a tighter spherical design.</li> <li>The <a href="/facts/JT-60/BmWrcR3E">JT-60</a> tokamak was upgraded to <a href="/facts/JT-60/BmWrcR3E">JT-60U</a> in March.<a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a></li> <li>On November 9, the <a href="/facts/Joint_European_Torus/faIvLnuY">JET</a> tokamak achieves the first 50-50 mix deuterium-tritium fusion experiments via magnetic confinement.<a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a></li></ul></li> <li>1992 <ul><li>The Engineering Design Activity for the <a href="/facts/ITER/SkpWL87b">ITER</a> starts with participants <a href="/facts/EURATOM/tYFVyafy">EURATOM</a>, Japan, Russia and United States. It ended in 2001.</li> <li>The United States and the former republics of the Soviet Union cease nuclear weapons testing.</li></ul></li> <li>1993 <ul><li>The <a href="/facts/TFTR/FowURWWA">TFTR</a> tokamak at <a href="/facts/Princeton_University/n3EPGHBM">Princeton</a> (PPPL) experiments with a 50% <a href="/facts/Deuterium/Bv4wfCkw">deuterium</a>, 50% <a href="/facts/Tritium/HWSa6EHy">tritium</a> mix, eventually producing as much as 10 megawatts of power from a controlled fusion reaction.</li></ul></li> <li>1994 <ul><li>NIF Beamlet laser is completed and begins experiments validating the expected performance of NIF.</li> <li>The USA declassifies information about indirectly driven (hohlraum) target design.</li> <li>Comprehensive European-based study of HIF driver begins, centered at the Gesellschaft für Schwerionenforschung (GSI) and involving 14 laboratories, including USA and Russia. The Heavy Ion Driven Inertial Fusion (HIDIF) study will be completed in 1997.</li></ul></li> <li>1996 <ul><li>A record is reached at <a href="/facts/Tore_Supra/qk6noP8t">Tore Supra</a>: a plasma duration of two minutes with a current of almost 1 million amperes driven non-inductively by 2.3 MW of <a href="/facts/Lower_hybrid_oscillation/kIt2wIjG">lower hybrid frequency waves</a> (i.e. 280 MJ of injected and extracted energy). This result was possible due to the actively cooled plasma-facing components installed in the machine.<a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a></li> <li>On 31 October, the <a href="/facts/JT-60/BmWrcR3E">JT-60U</a> tokamak achieves the first <a href="/facts/Fusion_energy_gain_factor/vBUBhCmH">extrapolated breakeven</a> at <i>Q</i>DTeq = 1.05.</li> <li>The <a href="/facts/Comprehensive_Nuclear-Test-Ban_Treaty/PJukufKN">Comprehensive Nuclear-Test-Ban Treaty</a> is signed, ending weapons testing by almost all nuclear states. ICF experiments and supercomputer simulation gain funding under the US <a href="/facts/Stockpile_stewardship/o3YANNHj">Science-Based Stockpile Stewardship</a> and similar programs.</li></ul></li> <li>1997 <ul><li>The <a href="/facts/Joint_European_Torus/faIvLnuY">JET</a> tokamak in the UK produces 16 MW of fusion power - this remains the world record for fusion power until 2022 when JET sets an even higher record. Four megawatts of <a href="/facts/Alpha_particle/dzNMs9WP">alpha particle</a> self-heating was achieved.</li> <li>LLNL study compared projected costs of power from ICF and other fusion approaches to the projected future costs of existing energy sources.</li> <li><a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a>: Groundbreaking ceremony</li></ul></li> <li>1998 <ul><li>The <a href="/facts/JT-60/BmWrcR3E">JT-60U</a> tokamak achieves an <a href="/facts/Fusion_energy_gain_factor/vBUBhCmH">extrapolated breakeven</a> of <i>Q</i>DTeq = 1.25, the current world record.</li> <li>Results of European-based study of heavy ion driven fusion power system (HIDIF, GSI-98-06) incorporates telescoping beams of multiple isotopic species. This technique multiplies the 6-D phase space usable for the design of HIF drivers.</li></ul></li> <li>1999 <ul><li>The United States withdraws from the <a href="/facts/ITER/SkpWL87b">ITER</a> project.</li> <li>The <a href="/facts/Small_Tight_Aspect_Ratio_Tokamak/DEXj9lbP">START</a> experiment is succeeded by <a href="/facts/Mega_Ampere_Spherical_Tokamak/YM3uxSzl">MAST</a>.</li></ul></li></ul> <h2 id="2000s">2000s</h2> <ul><li>2001 <ul><li><a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a>: Facility construction completed, laser construction begins</li> <li>Negotiations on the Joint Implementation of <a href="/facts/ITER/SkpWL87b">ITER</a> begin between Canada, countries represented by the <a href="/facts/European_Union/6GYcR8qM">European Union</a>, Japan and Russia.</li></ul></li> <li>2002 <ul><li>Claims and counter-claims are published regarding <a href="/facts/Bubble_fusion/0oPPhH9z">bubble fusion</a>, in which a table-top apparatus was reported as producing small-scale fusion in a liquid undergoing <a href="/facts/Cavitation/RFSxKS41">acoustic cavitation</a>. Like cold fusion (see 1989), it is later dismissed.</li> <li><a href="/facts/European_Union/6GYcR8qM">European Union</a> proposes <a href="/facts/Cadarache/tAp2aLQH">Cadarache</a> in France and <a href="/facts/Vandellos/CuKommbm">Vandellos</a> in Spain as candidate sites for <a href="/facts/ITER/SkpWL87b">ITER</a> while Japan proposes <a href="/facts/Rokkasho/Wl314StN">Rokkasho</a>.</li></ul></li> <li>2003 <ul><li>The United States rejoins the <a href="/facts/ITER/SkpWL87b">ITER</a> project with China and <a href="/facts/Republic_of_Korea/pCobAaVw">Republic of Korea</a> also joining. Canada withdraws.</li> <li><a href="/facts/Cadarache/tAp2aLQH">Cadarache</a> in France is selected as the European Candidate Site for <a href="/facts/ITER/SkpWL87b">ITER</a>.</li> <li>In April, <a href="/facts/Sandia_National_Laboratories/LYsKDj45">Sandia National Laboratories</a>' <a href="/facts/Z_Pulsed_Power_Facility/zSCKHpXY">Z machine</a> produces its first DD fusion neutrons.<a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a></li> <li><a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a>: First laser pulse (10.4 kJ IR, 4 beams).</li></ul></li> <li>2004 <ul><li>The United States drops its own ITER-scale tokamak project, FIRE, recognising an inability to match EU progress.<a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a></li></ul></li> <li>2005 <ul><li>In August, the first <a href="/facts/Proton-boron_fusion/QMVh1qMo">proton-boron fusion</a> via inertial confinement is reported.<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a></li> <li>Following final negotiations between the EU and Japan, <a href="/facts/ITER/SkpWL87b">ITER</a> chooses <a href="/facts/Cadarache/tAp2aLQH">Cadarache</a> over <a href="/facts/Rokkasho/Wl314StN">Rokkasho</a> for the site of the reactor. In concession, Japan is able to host the related materials research facility and granted rights to fill 20% of the project's research posts while providing 10% of the funding.</li> <li><a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a>: First eight-beam laser pulse (152.8 kJ IR). It becomes the world's largest laser.</li></ul></li> <li>2006 <ul><li>China's <a href="/facts/Experimental_Advanced_Superconducting_Tokamak/4T2D9hJ3">Experimental Advanced Superconducting Tokamak</a> is completed, the first tokamak to toroidal and poloidal superconducting magnets.</li></ul></li> <li>2009 <ul><li><a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a>: On February 26, all 192 beams are fired for the first time.</li> <li><a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a>: In June, the first laser shots are fired into a hohlraum.</li> <li>Ricardo Betti, the third Under Secretary, responsible for Nuclear Energy, testifies before Congress: "IFE [ICF for energy production] has no home".</li></ul></li></ul> <h2 id="2010s">2010s</h2> <ul><li>2010 <ul><li>HIF-2010 Symposium in Darmstadt, Germany. Robert J Burke presented on Single Pass (Heavy Ion Fusion) HIF and Charles Helsley made a presentation on the commercialization of HIF within the decade.</li></ul></li> <li>2011 <ul><li>May 23–26, Workshop for Accelerators for Heavy Ion Fusion at Lawrence Berkeley National Laboratory, presentation by Robert J. Burke on "Single Pass Heavy Ion Fusion". The Accelerator Working Group publishes recommendations supporting moving RF accelerator driven HIF toward commercialization.<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a></li></ul></li> <li>2012 <ul><li>Stephen Slutz & Roger Vesey of Sandia National Labs publish a paper in Physical Review Letters presenting a computer simulation of the <a href="/facts/MagLIF/z6ymntQX">MagLIF</a> concept showing it can produce high gain. According to the simulation, a 70 Mega Amp Z-pinch facility in combination with a Laser may be able to produce a spectacular energy return of 1000 times the expended energy. A 60 MA facility would produce a 100x yield.<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a></li> <li><a href="/facts/Joint_European_Torus/faIvLnuY">JET</a> announces a major breakthrough in controlling instabilities in a fusion plasma. <a href="http://phys.org/news/2012-01-closer-nuclear-fusion.html?=y">One step closer to controlling nuclear fusion</a></li> <li>In August Robert J. Burke presents updates to the SPRFD HIF process<a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a> and Charles Helsley presents the Economics of SPRFD<a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a> at the 19th International HIF Symposium at <a href="/facts/Berkeley%2c_California/WBVjzd5l">Berkeley, California</a>. Industry was there in support of ion generation for SPRFD. The Fusion Power Corporation SPRFD patent is granted in Russia.</li></ul></li> <li>2013 <ul><li>China's <a href="/facts/EAST_(tokamak)/4T2D9hJ3">EAST</a> tokamak test reactor achieves a record confinement time of 30 seconds for plasma in the <a href="/facts/High-confinement_mode/zrR5gh6Y">high-confinement mode</a> (H-mode), thanks to improvements in heat dispersal from tokamak walls. This is an improvement of an order of magnitude with respect to state-of-the-art reactors.<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a></li> <li>Construction of <a href="/facts/JT-60/BmWrcR3E">JT-60SA</a> begins in January.</li></ul></li> <li>2014 <ul><li>US Scientists at <a href="/facts/National_Ignition_Facility/76Jz9cBW">NIF</a> successfully generate more energy from fusion reactions than the energy absorbed by the nuclear fuel.<a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a></li> <li><a href="/facts/Phoenix_Nuclear_Labs/688VVIT9">Phoenix Nuclear Labs</a> announces the sale of a high-yield neutron generator that could sustain 5×1011 <a href="/facts/Deuterium/Bv4wfCkw">deuterium</a> fusion reactions per second over a 24-hour period.<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a></li> <li>On 9 October 2014, fusion research bodies from European Union member states and Switzerland signed an agreement to cement European collaboration on fusion research and EUROfusion, the European Consortium for the Development of Fusion Energy, was born.<a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a></li></ul></li> <li>2015 <ul><li>Germany conducts the first plasma discharge in <a href="/facts/Wendelstein_7-X/7SyeJCXg">Wendelstein 7-X</a>, a large-scale stellarator capable of steady-state plasma confinement under fusion conditions.<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a></li> <li>In January the <a href="/facts/Polywell/Sfeh8p2d">polywell</a> is presented at <a href="/facts/Microsoft_Research/04A5LpMI">Microsoft Research</a>.<a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a></li> <li>In August, <a href="/facts/MIT/Xk49vNA8">MIT</a> announces the <a href="/facts/ARC_fusion_reactor/6EaKF6S1">ARC fusion reactor</a>, a compact tokamak using <a href="/facts/Rare-earth_barium-copper_oxide/TlqK6YR7">rare-earth barium-copper oxide</a> (REBCO) superconducting tapes to produce high-magnetic field coils that it claims produce comparable magnetic field strength in a smaller configuration than other designs.<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a></li></ul></li> <li>2016 <ul><li>The Wendelstein 7-X produces the device's first hydrogen plasma.<a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a></li></ul></li> <li>2017 <ul><li>China's <a href="/facts/EAST_(tokamak)/4T2D9hJ3">EAST</a> tokamak test reactor achieves a stable 101.2-second steady-state high confinement plasma, setting a world record in long-pulse H-mode operation on the night of July 3.<a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a></li> <li><a href="/facts/Helion_Energy/B9tld1yD">Helion Energy</a>'s fifth-generation plasma machine goes into operation, seeking to achieve plasma density of 20 Tesla and fusion temperatures.<a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a></li> <li>UK company <a href="/facts/Tokamak_Energy/0al8hgJh">Tokamak Energy</a>'s ST40 fusion reactor generates first plasma.<a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a></li> <li><a href="/facts/TAE_Technologies/NT76fqNS">TAE Technologies</a> announces that the Norman reactor had achieved plasma.<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a></li> <li>On March 7, Japan's <a href="/facts/Large_Helical_Device/DE01sJS7">Large Helical Device</a> completes its first deuterium plasma experiment, marking the first fusion in a stellarator device.<a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a></li></ul></li> <li>2018 <ul><li>Energy corporation <a href="/facts/Eni/JXU6XbUa">Eni</a> announces a $50 million investment in start-up <a href="/facts/Commonwealth_Fusion_Systems/tmdmB9CK">Commonwealth Fusion Systems</a>, to commercialize <a href="/facts/ARC_fusion_reactor/6EaKF6S1">ARC</a> technology via the <a href="/facts/SPARC_(tokamak)/lb2vVcqA">SPARC</a> test reactor in collaboration with MIT.<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a><a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a><a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a></li> <li>MIT scientists formulate a theoretical means to remove the excess heat from compact nuclear fusion reactors via larger and longer <a href="/facts/Divertor/P2xcFypT">divertors</a>.<a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a></li> <li><a href="/facts/General_Fusion/3BMqBxXj">General Fusion</a> begins developing a 70% scale demo system to be completed around 2023.<a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a></li> <li>TAE Technologies announces its reactor has reached a high temperature of nearly 20 million °C.<a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a></li> <li>The Fusion Industry Association founded as an initiative in 2018, is the unified voice of the fusion industry, working to transform the energy system with commercially viable fusion power.<a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a></li></ul></li> <li>2019 <ul><li>The United Kingdom announces a planned £200-million (US$248-million) investment to produce a design for the <a href="/facts/Spherical_Tokamak_for_Energy_Production/BH9cdmRp">Spherical Tokamak for Energy Production</a> (STEP) fusion facility around 2040.<a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a><a class="footnote-ref" id="fnref:74" href="#fn:74"><sup>74</sup></a></li></ul></li></ul> <h2 id="2020s">2020s</h2> <ul><li>2020 <ul><li>Assembly of <a href="/facts/ITER/SkpWL87b">ITER</a>, which has been under construction for years, commences.<a class="footnote-ref" id="fnref:75" href="#fn:75"><sup>75</sup></a></li> <li>The Chinese experimental <a href="/facts/Nuclear_fusion/hP0gLDqj">nuclear fusion</a> reactor <a href="/facts/HL-2M/y2d8IxMI">HL-2M</a> is turned on for the first time, achieving its first plasma discharge.<a class="footnote-ref" id="fnref:76" href="#fn:76"><sup>76</sup></a></li> <li>On November 1, the <a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a> records the first burning plasma achieved in a laboratory.<a class="footnote-ref" id="fnref:77" href="#fn:77"><sup>77</sup></a></li></ul></li> <li>2021 <ul><li>On August 8, the <a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a> records the first experiment to surpass the <a href="/facts/Lawson_criterion/aPUrM8Tp">Lawson criterion</a>.<a class="footnote-ref" id="fnref:78" href="#fn:78"><sup>78</sup></a><a class="footnote-ref" id="fnref:79" href="#fn:79"><sup>79</sup></a><a class="footnote-ref" id="fnref:80" href="#fn:80"><sup>80</sup></a></li> <li>[Record] China's <a href="/facts/Experimental_Advanced_Superconducting_Tokamak/4T2D9hJ3">Experimental Advanced Superconducting Tokamak</a> sustains a high-temperature plasma for 101 seconds (120 million °C).<a class="footnote-ref" id="fnref:81" href="#fn:81"><sup>81</sup></a></li> <li>[Record] The <a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a> achieves <i><a href="/facts/Fusion_energy_gain_factor/vBUBhCmH">Q</a></i> = 0.70.<a class="footnote-ref" id="fnref:82" href="#fn:82"><sup>82</sup></a></li> <li>[Record] China's <a href="/facts/Experimental_Advanced_Superconducting_Tokamak/4T2D9hJ3">Experimental Advanced Superconducting Tokamak</a> sustains a high-temperature plasma for 1,056 seconds (70 million °C).<a class="footnote-ref" id="fnref:83" href="#fn:83"><sup>83</sup></a><a class="footnote-ref" id="fnref:84" href="#fn:84"><sup>84</sup></a><a class="footnote-ref" id="fnref:85" href="#fn:85"><sup>85</sup></a></li></ul></li> <li>2022 <ul><li>[Record] The <a href="/facts/Joint_European_Torus/faIvLnuY">Joint European Torus</a> in Oxford, UK, produces a 59 MJ pulse (5 seconds).<a class="footnote-ref" id="fnref:86" href="#fn:86"><sup>86</sup></a><a class="footnote-ref" id="fnref:87" href="#fn:87"><sup>87</sup></a></li> <li>[Record] On August 8, the <a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a> records the first laboratory <a href="/facts/Fusion_ignition/sNSIxDsL">plasma ignition</a>. The <a href="/facts/Fusion_energy_gain_factor/vBUBhCmH">energy gain factor</a> was <i>Q</i> = 0.72, the ratio of laser beam input to fusion output.<a class="footnote-ref" id="fnref:88" href="#fn:88"><sup>88</sup></a><a class="footnote-ref" id="fnref:89" href="#fn:89"><sup>89</sup></a></li> <li>[Record] On December 5, the <a href="/facts/National_Ignition_Facility/76Jz9cBW">National Ignition Facility</a> records the first experiment to surpass <a href="/facts/Scientific_breakeven/vBUBhCmH">scientific breakeven</a>, achieving an <a href="/facts/Fusion_energy_gain_factor/vBUBhCmH">energy gain factor</a> of <i>Q</i> = 1.54, producing more fusion energy than the laser beam delivered to the target. Laser efficiency is on the order of 1%.<a class="footnote-ref" id="fnref:90" href="#fn:90"><sup>90</sup></a></li></ul></li> <li>2023 <ul><li>[Record] On February 15, 2023, <a href="/facts/Wendelstein_7-X/7SyeJCXg">Wendelstein 7-X</a> reached a new milestone: Power plasma with gigajoule energy turnover generated for eight minutes.<a class="footnote-ref" id="fnref:91" href="#fn:91"><sup>91</sup></a></li> <li>On February 21, 2023, the first proton-boron fusion via magnetic confinement is reported at Japan's <a href="/facts/Large_Helical_Device/DE01sJS7">Large Helical Device</a>. <a class="footnote-ref" id="fnref:92" href="#fn:92"><sup>92</sup></a></li> <li><a href="/facts/JT-60/BmWrcR3E">JT-60SA</a> achieves first plasma in October, making it the largest operational superconducting tokamak in the world.<a class="footnote-ref" id="fnref:93" href="#fn:93"><sup>93</sup></a></li> <li>On 18 December, <a href="/facts/Joint_European_Torus/faIvLnuY">Joint European Torus</a> pulses its final plasma before decommissioning, after over 40 years of operation.</li></ul></li> <li>2024 <ul><li>In June, the <a href="/facts/HH70/glsC1XtX">HH70</a> tokamak, built by the Chinese company Energy Singularity, achieves first plasma. It is the first fusion device to exclusively use <a href="/facts/High-temperature_superconductivity/MXtx2gvV">high-temperature superconducting</a> magnets.<a class="footnote-ref" id="fnref:94" href="#fn:94"><sup>94</sup></a></li> <li>The <a href="/facts/Korean_Superconducting_Tokamak_Advanced_Research/VLrK33yQ">Korean Superconducting Tokamak Advanced Research</a> sustains a high-temperature plasma for 48 seconds (100 million °C).<a class="footnote-ref" id="fnref:95" href="#fn:95"><sup>95</sup></a><a class="footnote-ref" id="fnref:96" href="#fn:96"><sup>96</sup></a></li></ul></li></ul> <ul><li>2025 <ul><li>In February, the CEA’s <a href="/facts/WEST_(formerly_Tore_Supra)/qk6noP8t">WEST</a> machine was able to maintain a plasma for more than 22 minutes. This was a 25% improvement on the previous record time achieved with EAST, in China, a few weeks previously.<a class="footnote-ref" id="fnref:97" href="#fn:97"><sup>97</sup></a></li></ul></li></ul> <h3>Citations</h3> <h3>Bibliography</h3> <ul><li>Dean, Stephen (2013). <i>Search for the Ultimate Energy Source</i>. Springer.</li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="https://web.archive.org/web/20031216103922/http://www.sciencemuseum.org.uk/on-line/fusion/famous.asp">Fusion experiments from the British Science Museum</a></li> <li>International Fusion Research Council, <a href="https://iopscience.iop.org/issue/0029-5515/45/10A">Status report on fusion research</a>, <i>Nuclear Fusion</i> 45:10A, October 2005.</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Eddington, A. S. (1920). "The Internal Constitution of the Stars". Science. 52 (1341): 233–240. ISSN 0036-8075. <a href="https://www.jstor.org/stable/1645153" target="_blank">https://www.jstor.org/stable/1645153</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Nimtz, G.; Clegg, B. (12 August 2009). Greenberger, D.; Hentschel, K.; Weinert, F. (eds.). Compendium of Quantum Physics. Springer. pp. 799–802. ISBN 978-3-540-70622-9. <a href="978-3-540-70622-9" target="_blank">978-3-540-70622-9</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Atkinson, R. d E.; Houtermans, F. G. (1929). "Zur Frage der Aufbaumöglichkeit der Elemente in Sternen". Zeitschrift für Physik. 54 (9–10): 656–665. Bibcode:1929ZPhy...54..656A. doi:10.1007/BF01341595. S2CID 123658609. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Arnoux, Robert (May 2014). "Who "invented" fusion?". Iter. <a href="https://www.iter.org/mag/3/29" target="_blank">https://www.iter.org/mag/3/29</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Arnoux, Robert (May 2014). "Who "invented" fusion?". Iter. <a href="https://www.iter.org/mag/3/29" target="_blank">https://www.iter.org/mag/3/29</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"Mark Oliphant". Mark Oliphant. ETHW. 4 February 2016. Retrieved 11 March 2016. <a href="http://ethw.org/Mark_Oliphant" target="_blank">http://ethw.org/Mark_Oliphant</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>C.F. von Weizsäcker (1937) "Über Elementumwandlungen im Innern der Sterne. I" (On transformations of elements in the interiors of stars. I), Physikalische Zeitschrift (Physics Journal), vol. 38, pages 176–191. <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Bethe, H. A.; Critchfield, C. L. (1938-08-15). 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"Who 'invented' fusion?". <a href="https://www.iter.org/mag/3/29" target="_blank">https://www.iter.org/mag/3/29</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>Hendry, John; Lawson, John (January 1993). Fusion Research in the UK 1945 – 1960 (PDF). AEA Technology. <a href="/wiki/John_D._Lawson_(scientist)" target="_blank">/wiki/John_D._Lawson_(scientist)</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>Hendry, John; Lawson, John (January 1993). Fusion Research in the UK 1945 – 1960 (PDF). AEA Technology. <a href="/wiki/John_D._Lawson_(scientist)" target="_blank">/wiki/John_D._Lawson_(scientist)</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>Hendry, John; Lawson, John (January 1993). Fusion Research in the UK 1945 – 1960 (PDF). AEA Technology. <a href="/wiki/John_D._Lawson_(scientist)" target="_blank">/wiki/John_D._Lawson_(scientist)</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>Hendry, John; Lawson, John (January 1993). Fusion Research in the UK 1945 – 1960 (PDF). AEA Technology. <a href="/wiki/John_D._Lawson_(scientist)" target="_blank">/wiki/John_D._Lawson_(scientist)</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> <li id="fn:19"><p>Hendry, John; Lawson, John (January 1993). Fusion Research in the UK 1945 – 1960 (PDF). AEA Technology. <a href="/wiki/John_D._Lawson_(scientist)" target="_blank">/wiki/John_D._Lawson_(scientist)</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></p></li> <li id="fn:20"><p>...the first money to be allocated [to controlled nuclear research] happened to be for Tuck, and was diverted from Project Lincoln, in the Hood Laboratory. The coincidence of names prompted the well-known cover name "Project Sherwood". James L. Tuck, "Curriculum Vita and Autobiography", declassified document from Los Alamos National Laboratory (1974), reproduced with permission. Archived 9 February 2012. <a href="http://bayesrules.net/JamesTuckVitaeAndBiography.pdf" target="_blank">http://bayesrules.net/JamesTuckVitaeAndBiography.pdf</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></p></li> <li id="fn:21"><p>Goncharov, German A (1996-10-31). "American and Soviet H-bomb development programmes: historical background". Physics-Uspekhi. 39 (10): 1033–1044. doi:10.1070/PU1996v039n10ABEH000174. ISSN 1063-7869. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></p></li> <li id="fn:22"><p>Smirnov, V.P. (2009-12-30). "Tokamak foundation in USSR/Russia 1950–1990". Nuclear Fusion. 50 (1). IOP Publishing: 014003. doi:10.1088/0029-5515/50/1/014003. 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Archived 20 July 2015. <a href="http://www.efda.org/2010/04/lecture-of-i-v-kurchatov-at-harwell/" target="_blank">http://www.efda.org/2010/04/lecture-of-i-v-kurchatov-at-harwell/</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></p></li> <li id="fn:26"><p>In 1957, Los Alamos achieved the first controlled thermonuclear plasma., Now and Then at Los Alamos. <a href="http://www.lanl.gov/about/history-innovation/now-then-los-alamos.php" target="_blank">http://www.lanl.gov/about/history-innovation/now-then-los-alamos.php</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></p></li> <li id="fn:27"><p>Reviewing next the thermonuclear plasma achievements at Los Alamos, we have achieved:(1) The first controlled thermonuclear reaction., Review of Controlled Thermonuclear Research at Los Alamos 1965, J. L. 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