{"product_id":"ignia-the-lawson-criterion-physics-t-shirt","title":"Ignia – The Lawson Criterion Physics T-Shirt","description":"\u003cp\u003eIgnia holds a star in a bottle. To light it, she needs it dense enough, hot enough, for long enough.\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eFor a deuterium–tritium plasma to ignite, the product of density, temperature and energy confinement time must pass a threshold, lowest near 14 keV. Each fusion makes a 3.5 MeV helium nucleus, which stays to heat the plasma, and a 14.1 MeV neutron.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003en T τ_E ≳ 3 × 10²¹ keV·s·m⁻³,   D + T → ⁴He (3.5 MeV) + n (14.1 MeV)\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003en: ion density (m⁻³)\u003c\/li\u003e\n\u003cli\u003eT: temperature (keV; 1 keV ≈ 11.6 million K)\u003c\/li\u003e\n\u003cli\u003eτ_E: energy confinement time (s)\u003c\/li\u003e\n\u003cli\u003eD, T: deuterium, tritium\u003c\/li\u003e\n\u003cli\u003en (in the reaction): neutron\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eJ. D. Lawson set out the criterion in 1957; on 5 Dec 2022 the National Ignition Facility put 2.05 MJ of laser light on a target and got 3.15 MJ out, a target gain of about 1.5.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e The lasers drew about 100 times more energy from the grid. That was target gain, not net or wall-plug gain.\u003c\/p\u003e\u003ch3\u003eOn the shirt\u003c\/h3\u003e\u003cp\u003eFront: Ignia, the pixel-art character, with the title. Back: the triple product, the D–T reaction, the NIF 2022 result and the wall-plug caveat. Printed on a unisex tee.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"S \/ White","offer_id":50936646041703,"sku":"46859456734895146006","price":29.99,"currency_code":"USD","in_stock":true},{"title":"S \/ Black","offer_id":50936646074471,"sku":"27788989706024017618","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ White","offer_id":50936646107239,"sku":"54463159942084906478","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ Black","offer_id":50936646140007,"sku":"29564331158167828008","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ White","offer_id":50936646172775,"sku":"78316373989914272321","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ Black","offer_id":50936646205543,"sku":"33511773981949170813","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ White","offer_id":50936646238311,"sku":"12730678778889112341","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ Black","offer_id":50936646271079,"sku":"39008611803434588950","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ White","offer_id":50936646303847,"sku":"17315249570400973158","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ Black","offer_id":50936646336615,"sku":"19948984285805274679","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ White","offer_id":50936646369383,"sku":"15738089633410109386","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ Black","offer_id":50936646402151,"sku":"11147134583704256680","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ White","offer_id":50936646434919,"sku":"32351234206805732462","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ Black","offer_id":50936646467687,"sku":"11358626434799455453","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ White","offer_id":50936646500455,"sku":"18218938735075853052","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ Black","offer_id":50936646533223,"sku":"86846505302174722001","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/lawson-criterion_front_16_white.png?v=1793595763","url":"https:\/\/pixelatedphysics.com\/id\/products\/ignia-the-lawson-criterion-physics-t-shirt","provider":"Pixelated Physics","version":"1.0","type":"link"}