{"id":11579,"date":"2024-01-29T21:22:21","date_gmt":"2024-01-29T21:22:21","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/la-fusion-nucleaire-nest-plus-une-utopie"},"modified":"2024-01-29T22:52:53","modified_gmt":"2024-01-29T22:52:53","slug":"la-fusion-nucleaire-nest-plus-une-utopie","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/la-fusion-nucleaire-nest-plus-une-utopie","title":{"rendered":"La fusion nucl\u00e9aire n\u2019est plus une utopie"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>Fusionner la matie\u0300re de sorte qu\u2019elle libe\u0300re plus d\u2019e\u0301nergie qu\u2019on ne lui en a apporte\u0301. C\u2019est la premie\u0300re condition pour exploiter une source d\u2019e\u0301nergie quasi ine\u0301puisable a\u0300 l\u2019e\u0301chelle de l\u2019humanite\u0301: l\u2019hydroge\u0300ne, dont la fusion \u2013 ou plus exactement, celle des noyaux de ses isotopes deute\u0301rium et tritium \u2013 produit de l\u2019he\u0301lium&#8230; et de l\u2019e\u0301nergie.<\/p>\n<p><b>De l\u2019e\u0301nergie libe\u0301re\u0301e pendant quelques milliardie\u0300mes de seconde<\/b><\/p>\n<p>Ce pre\u0301requis indispensable a enfin e\u0301te\u0301 satisfait en de\u0301cembre 2022, puis en juillet 2023. Dans un laboratoire du De\u0301partement ame\u0301ricain de l\u2019e\u0301nergie (DOE), du combustible enferme\u0301 dans une petite capsule a fusionne\u0301 et libe\u0301re\u0301 au moins 1,5 fois plus d\u2019e\u0301nergie que celle-ci n\u2019en avait rec\u0327u, le tout pendant quelques milliardie\u0300mes de seconde. C\u2019est plus efficace que le ratio de 0,7 \u2013 mais sur une dure\u0301e de cinq secondes \u2013 obtenu avec le JET en Grande-Bretagne en 2021.<\/p>\n<p><b>Une route encore longue<\/b><\/p>\n<p>Cette machine a\u0300 confinement magne\u0301tique enferme la matie\u0300re e\u0301chauffe\u0301e a\u0300 plus de 100 millions de degre\u0301s gra\u0302ce a\u0300 des aimants surpuissants. De son co\u0302te\u0301, le DOE utilise le confinement inertiel: 192 faisceaux laser tre\u0300s intenses bombardent simultane\u0301ment le combustible. Si l\u2019exploit ame\u0301ricain est indiscutable, la route sera longue avant de concre\u0301tiser cette approche, puisqu\u2019il a fallu 300 me\u0301gajoules (83 kWh) pour alimenter les lasers et produire in fine 3 MJ (0,83 kWh). Pour fournir de l\u2019e\u0301lectricite\u0301 ainsi, il faudra donc e\u0302tre&#8230; 500 fois plus efficace, et conduire dix fusions par seconde !<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/sao-tome-e-principe\">S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. Fusionner la matie\u0300re de sorte qu\u2019elle libe\u0300re plus d\u2019e\u0301nergie qu\u2019on ne lui en a apporte\u0301. C\u2019est la premie\u0300re condition pour exploiter une source d\u2019e\u0301nergie quasi ine\u0301puisable a\u0300 l\u2019e\u0301chelle de l\u2019humanite\u0301: l\u2019hydroge\u0300ne, dont la fusion \u2013 ou plus exactement, celle des noyaux de ses isotopes deute\u0301rium et tritium \u2013 produit [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":11578,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-11579","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>La fusion nucl\u00e9aire n\u2019est plus une utopie - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"Fusionner la matie\u0300re de sorte qu\u2019elle libe\u0300re plus d\u2019e\u0301nergie qu\u2019on ne lui en a apporte\u0301. 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