The pulse lasts about as long as it takes to read this sentence aloud.<\/p>\n
Inside a steel torus, hydrogen sits as plasma at ten times the temperature of the core of the sun, held clear of the walls by magnets.<\/p>\n
Five seconds. Then nothing.<\/p>\n
Almost every account of that moment reported the total, and almost none explained why the five seconds<\/strong> mattered more than the total itself<\/strong>.<\/p>\n A spike is easy.<\/p>\n Holding full fusion power<\/strong> steady is the thing nobody had shown at that scale on real reactor fuel.<\/p>\n Fusion does not hand you electricity. It hands you neutrons.<\/p>\n Deuterium and tritium fuse, and most of the released energy leaves as fast neutrons that pass straight through the magnetic field because they carry no charge.<\/p>\n They stop in the wall.<\/p>\n The structure absorbs them and heats up, which in a power station would be the entire point, because that heat is what drives a turbine, so every extra second<\/strong> of steady plasma is energy actually banked.<\/p>\n Holding it steady is the hard part.<\/p>\n The plasma edge throws bursts of energy at the wall and the exhaust runs hot enough to damage whatever it touches, and both have to be tamed at once<\/strong> or the discharge collapses early<\/strong>.<\/p>\n The machine sat on a research campus in Oxfordshire and ran for forty years.<\/p>\n Its final campaign used the deuterium and tritium mixture a commercial plant would burn, which almost no facility on earth is licensed to handle.<\/p>\n The goal was not a record.<\/p>\n It was to show that the operating scenarios written for the next machine, the one under construction in southern France, could be produced deliberately and then reproduced afterward<\/strong>.<\/p>\n Records are what happens when that works.<\/p>\n More than 300 scientists<\/strong> and engineers worked the campaign, and the facility ended its life having fired 105,842 pulses<\/strong> since it first ran.<\/p>\n Pulse number 104,522, on the third of October in 2023.<\/p>\n High fusion power ran for 5.2 seconds and the instruments logged 69.26 megajoules out of a fuel charge of roughly a fifth of a milligram.<\/p>\n The marks before it were 22.7 megajoules in 1997 and 59 in 2021.<\/p>\n Getting the same energy from lignite would take 4.4 pounds<\/strong> of it, which is the comparison the physicists reach for themselves.<\/p>\n It is also twenty times<\/strong> what the large American laser facility released in its own record shot that month.<\/p>\n The team was candid about how it happened.<\/p>\n One of the task force leaders described the world record as a by product<\/strong>, not actively planned, although they had been quietly hoping for it.<\/p>\n Sixty nine megajoules is 19.2 kilowatt hours<\/strong>.<\/p>\n An average American house gets through more than that before dinner, and the entire record output would not run a single house<\/strong> for a day.<\/p>\n That is not a criticism of the result. It is the scale.<\/p>\n More energy went into heating the plasma than the reactions gave back, which was always true here and stays true until something much larger exists, and the record pulse<\/a> was never presented otherwise.<\/p>\n Even the duration is published three ways.<\/p>\n The operator says five seconds. The European consortium says six. The German institute that released the pulse number says 5.2, which is a fifth of spread<\/strong> on the headline figure and nobody has reconciled it.<\/p>\n Different machines chase different records, and one in southern France held a plasma for 22 minutes<\/a> without producing anything close to this much energy.<\/p>\n The successor is late, and the targets moved with it.<\/p>\n Under the baseline agreed in 2024 the French machine starts research operations in 2034, reaches full magnetic energy in 2036, and does not begin deuterium tritium work until 2039.<\/p>\n Its target is ten out for one in.<\/p>\n Five hundred megawatts of fusion power from fifty megawatts of heating, which is an order of magnitude<\/strong> past anything demonstrated, and its own schedule<\/a> now puts that fifteen years out.<\/p>\n Meanwhile the old machine is coming apart.<\/p>\n Not scrapped. Dismantling runs to roughly 2040, and it is the first time anyone has taken down a large tokamak that burned tritium.<\/p>\n So 66 sample tiles<\/strong> came out under remote handling, to be measured for beryllium, tungsten and absorbed fuel.<\/p>\n The French site keeps its own strange ledger, where 130 bird species<\/a> moved into 445 fenced acres nobody had been managing for them.<\/p>\n The record will stand for years, because nothing else can run this fuel.<\/p>\n What it proves is narrower than the headline and more useful, which is that fusion energy<\/strong> can be held at full power on demand, for as long as a machine that size was ever going to allow.<\/p>\n","protected":false},"excerpt":{"rendered":" The pulse lasts about as long as it takes to read this sentence aloud. Inside a steel torus, hydrogen sits as plasma at ten times the temperature of the core of the sun, held clear of the walls by magnets. Five seconds. Then nothing. Almost every account of that moment reported the total, and almost … Read more<\/a><\/p>\n","protected":false},"author":28,"featured_media":34847,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"rank_math_focus_keyword":"scientists fired 69","rank_math_title":"They ran a machine in Oxfordshire on a fuel load lighter than a grain of sand for 5 seconds and set the fusion energy record the field still quotes, and the whole burst came to 19 kilowatt hours","rank_math_description":"JET's last experiment fed 0.2 mg of hydrogen fuel into a reactor for 5.2 seconds and released 69 megajoules \u2014 a fusion energy record that closes four deca","footnotes":""},"categories":[8],"tags":[],"class_list":["post-34844","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-energy"],"_links":{"self":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/posts\/34844","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/users\/28"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/comments?post=34844"}],"version-history":[{"count":0,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/posts\/34844\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/media\/34847"}],"wp:attachment":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/media?parent=34844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/categories?post=34844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/tags?post=34844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Why the seconds matter more than the megajoules<\/h2>\n
What the campaign was actually for<\/h2>\n
The shot itself<\/h2>\n
The number underneath the number<\/h2>\n
What has to happen next<\/h2>\n