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Progress and status of the J-PARC 3 GeV RCS

J-PARC 3GeVシンクロトロンの性能向上と現状

金正 倫計

Kinsho, Michikazu

J-PARC 3GeVシンクロトロン(RCS)は、先の東日本大震災の際機器が大きく移動した。これが原因で400kW以上のビームパワーでは、ビームロスが大きくなることが分かったため、機器の再アライメントを実施した。また、J-PARCでは1MW達成に向けて、リニアックのエネルギーを181MeVから400MeVに増強した。これに伴い、RCSでも400MeVのビームを受け入れ、3GeVまでの加速、取り出しに成功した。本条件で300kWのユーザー運転を実施している。大強度試験も併せて実施し、短時間ではあるが、560kW相当のビームを0.3%以下のロスでの運転に成功した。

Big issue for the J-PARC rapid cycling synchrotron (RCS) was displacement of main magnets caused by last big earthquake because this made beam loss more than 400 kW beam power. Since realignment of main magnets and other components was essential to realize higher beam power and stable operation, this work has been done during maintenance period in 2013. To achieve the nominal performance 1MW beam power at the RCS and 0.75 MW at the MR, beam energy of linac was increased from 181 MeV to 400 MeV with a new accelerating structure ACS (Annular-ring Coupled Structure) linac from this January. It was successful 400 MeV beam injection and 3 GeV beam extraction at the RCS, and user operation has been performed with beam power of 300 kW. An equivalent beam power of 560 kW with a beam loss of only 0.3% could be achieved during short time for high intensity beam study.

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