{"id":15394,"date":"2025-12-18T10:42:37","date_gmt":"2025-12-18T15:42:37","guid":{"rendered":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/?p=15394"},"modified":"2025-12-18T10:43:41","modified_gmt":"2025-12-18T15:43:41","slug":"future-collider-update","status":"publish","type":"post","link":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/?p=15394","title":{"rendered":"Future Collider Update"},"content":{"rendered":"<p>Various news about a possible future collider, all pointing to the CERN FCC-ee as the leading proposal.<\/p>\n<ul>\n<li>For up to date background technical information on proposed colliders, including cost estimates, see <a href=\"https:\/\/arxiv.org\/abs\/2511.20417\">here<\/a>.<\/li>\n<li>The Chinese CEPC plan is now on hold, as <a href=\"https:\/\/cerncourier.com\/a\/cepc-matures-but-approval-is-on-hold\/\">a decision was reached to not include it in China&#8217;s plans for the next five years (2026-30)<\/a>.<\/li>\n<li>As part of the European Strategy for Particle Physics update process, recommendations drafted earlier this month have now been released (see <a href=\"https:\/\/home.cern\/news\/press-release\/cern\/european-strategy-particle-physics-reaches-important-milestone\">here<\/a> and <a href=\"https:\/\/cds.cern.ch\/record\/2950671\">here<\/a>).  As expected, the main recommendation is to pursue the FCC-ee project, which will cost an estimated \\$18 billion dollars or so.  The fall-back recommendation in case this is too expensive is rather odd.  People were expecting such a fall-back to be some sort of linear collider, which would cost half as much.  Instead the fall-back recommendation was for essentially the same FCC-ee project, saving just 15% with various cuts to its capabilities.  There&#8217;s a reaction to this from the linear collider people <a href=\"https:\/\/newsline.linearcollider.org\/2025\/12\/18\/first-reflections-on-the-recommendations-of-the-european-strategy-group\/\">here<\/a>.<\/li>\n<li>CERN today <a href=\"https:\/\/home.cern\/news\/press-release\/cern\/private-donors-pledge-860-million-euros-cerns-future-circular-collider\">announced<\/a> that private donors have pledged \\$1 billion towards the FCC-ee project.<\/li>\n<\/ul>\n<p>CERN will not make a final decision on this until 2028.  I&#8217;ve always been skeptical that there is a viable financial path to funding a \\$15 &#8211; \\$20 billion new collider.  Perhaps in our new world order where everything is controlled by trillionaire tech bros, the financing won&#8217;t be a problem.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Various news about a possible future collider, all pointing to the CERN FCC-ee as the leading proposal. For up to date background technical information on proposed colliders, including cost estimates, see here. The Chinese CEPC plan is now on hold, &hellip; <a href=\"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/?p=15394\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[9],"tags":[],"class_list":["post-15394","post","type-post","status-publish","format-standard","hentry","category-experimental-hep-news"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/15394","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=15394"}],"version-history":[{"count":6,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/15394\/revisions"}],"predecessor-version":[{"id":15400,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/15394\/revisions\/15400"}],"wp:attachment":[{"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=15394"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15394"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.math.columbia.edu\/~woit\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15394"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}