In the energy frontier, a global consensus for an e+e– Higgs factory as the next collider has been reaffirmed. While some options (e.g. the International Linear Collider) have mature designs, other options (such as FCC-ee, C3, HELEN and CLIC) require further R&D to understand if they are viable.

Patrick Janot at CERN and Alain Blondel, a particle physicist at the University of Geneva, used published details of five leading ‘Higgs factory’ designs to calculate the energy consumption per Higgs boson for each. As well as the FCC and China’s proposed Circular Electron Positron Collider (CEPC), they looked at three proposals for linear colliders: a long-planned International Linear Collider (ILC) in Japan, CERN’s own Compact Linear Collider (CLIC) and the Cool Copper Collider (C3), a compact US-based accelerator.

国際リニアコライダー(ILC)の誘致に取り組む超党派のリニアコライダー国際研究所建設推進議員連盟（会長・塩谷立衆院議員）は2日、永岡桂子文部科学相に対し、計画推進に向けて国際連携をさらに深めるよう要望した。

Dort entdeckten Forscher im Jahr 2012 das lang gesuchte Higgs-Teilchen. Auch an dem Zukunftsprojekt International Linear Collider ILC , einem Linearbeschleuniger, der unter anderem das Higgs-Teilchen näher untersuchen soll, arbeitet das DESY mit. Allerdings steht die endgültige Entscheidung, ob dieses Projekt verwirklicht wird, derzeit noch aus.

The most technically ready design is the International Linear Collider (ILC), which would start at 250 gigaelectronvolts and could be extended to one teraelectronvolt. The project has been in limbo for years, with Japan as host waiting for financial commitments from international partners, and potential partners — including the U.S. — waiting for Japan to proceed with the project.

This Higgs machine would be a linear collider around 20 kilometers in length. There’s an ongoing debate about which country might have the resources to host it

経団連と東北経済連合会（東経連）は18日、仙台市で経済懇談会を開き、科学技術分野の連携を強化する共同宣言をまとめた。——共同宣言では次世代放射光施設「ナノテラス」に加え、国際熱核融合実験炉（ITER）関連、福島イノベーション・コースト構想、次世代加速器「国際リニアコライダー（ILC）」の推進支援を掲げた。

国際リニアコライダーの日本誘致を推進する超党派のリニアコライダー国際研究所建設推進議員連盟（会長・塩谷立衆院議員）は13日、国会内で総会を開き、ILC国際推進チームの中田達也議長が講演した。文部科学省が２０２３年度予算の概算要求でILCに関連し前年度当初予算から倍増の9億7千万円を盛り込んだことについて、中田氏は「倍というのはインパクトが大きい」と期待感を示した。

But an outsider might wonder why another Higgs-factory proposal is being added to the particle-physics menu. A similar factory design—the International Linear Collider (ILC)—has been in the works for years, but that project is presently stalled, as the Japanese government has not yet confirmed its support for building the facility in Japan. Waiting in the wings are several other large particle-physics proposals, including CERN’s Future Circular Collider and China’s Circular Electron Positron Collider.

The most technically ready design is the International Linear Collider (ILC), which would start at 250 GeV and could be extended to 1 TeV. The project has been in limbo for years, with Japan as host waiting for financial commitments from international partners, and potential partners—including the US—waiting for Japan to proceed with the project

There are currently five proposals for a high-energy positron–electron collider, with the International Linear Collider (ILC) in Japan, the Cool Copper Collider (C3) in the US and the Compact Linear Collider at CERN all based on linear accelerators. The FCC and the China Electron Positron Collider (CEPC) in China, meanwhile, are circular colliders.

Międzynarodowa społeczność fizyków zastanawia się obecnie nad budową trzech akceleratorów liniowych – International Linear Collider (ILC) w Japonii, Cool Copper Collider (C3) w USA oraz Compact Linear Collider w CERN – i dwóch kołowych – FCC i China Electron Positron Collider (CEPC) w Chinach. Naukowcy podają argumenty za konkretnymi rozwiązaniami, a Janot i Blondel postulują, by “w przyszłych projektach z dziedziny fizyki wysokich energii uwzględniać nie tylko koszt i wydajność akceleratora, ale również jego ślad węglowy na każdy uzyskany wynik naukowy”, stwierdzają naukowcy.

The nearest-term possibility for such a Higgs factory is the International Linear Collider, which would be built in Japan. Though it is shovel-ready, the project has been delayed for years, and in February it was dealt another, possibly fatal blow when the Japanese government refused to allow it to go forward.

From 2005 to 2013 Barish was director of the Global Design Effort of the International Linear Collider (ILC), a proposed 31-kilometer- (19-mile-) long linear particle accelerator. The ILC is the highest priority future project for particle physics worldwide.

文部科学省は３０日、２０２３年度予算の概算要求を発表し、国際リニアコライダー（ＩＬＣ）の関連で２２年度当初予算から倍増の９億７千万円を盛り込んだ。先端加速器の性能向上に向け、海外研究機関との技術開発を着実に進める。

Meanwhile, some researchers hope that plans for a large international project, the International Linear Collider (ILC), spearheaded by physicists in Japan, might also go forward. Rather than moving in circles, the particles in the ILC (electrons and positrons) would be accelerated in a straight line along two 20km accelerators before being smashed together. “The ILC technology is now ready and proven,” says Suzie Sheehy, an accelerator physicist at the Universities of Oxford and Melbourne.

今月１０日の内閣改造で初入閣した秋葉賢也復興大臣が就任後初めて岩手県を訪れ、達増知事と震災からの復興について意見を交わしました。—-▽漁業や水産加工業の状況や、▽岩手県が取り組んでいるＩＬＣ＝国際リニアコライダーの誘致について意見が交わされたということです。