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Estimation of secondary electron effect in the J-PARC Rapid cycling synchrotron after first study

J-PARC 3GeV RCS初期コミッショニングにおける二次電子の影響評価

山本 風海   ; 神谷 潤一郎   ; 荻原 徳男; 金正 倫計  ; 林 直樹  ; 佐伯 理生二; 佐藤 健一郎*; 外山 毅*

Yamamoto, Kazami; Kamiya, Junichiro; Ogiwara, Norio; Kinsho, Michikazu; Hayashi, Naoki; Saeki, Riuji; Sato, Kenichiro*; Toyama, Takeshi*

J-PARC計画3GeVシンクロトロンは、1MWの大強度ビームを25Hzという早い繰り返しで50GeVシンクロトロンと物質生命科学実験施設に供給することを目的に建設され、ビーム試験が行われている。このような大強度の加速器では、ビームによって誘起された二次電子がビームに影響を与えることが想定される。本研究では、加速器に使用している真空容器内壁からの二次電子放出量を測定し、実際のビームロスの状況から加速器内における二次電子の影響の評価を行う。

The Japan Proton Accelerator Research Complex (J-PARC) project is a joint project of Japan Atomic Energy Agency (JAEA) and High Energy Accelerator Research Organization (KEK). The accelerator complex of J-PARC consists of a 181 MeV Linac, a 3 GeV Rapid-Cycling Synchrotron (RCS) and a 50 GeV Main Ring (MR). The RCS ring is designed to support 1 MW of beam and to deliver a 3 GeV pulsed proton beam to the spallation neutron target and the MR at a repetition rate of 25 Hz. Since the RCS finally accelerates very high intensity beam, the secondary electron cloud may affect the accelerator performance. The electron cloud effect in RCS was evaluated by simulations, but the secondary electron emission yield (SEY) of the chamber surface and beam loss point, lost proton number were assumed. In this Study we measured the SEY from the samples which was dealt with similar process of an actual chamber surface. We estimate the practical influence of the secondary electron cloud during beam operation.

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パーセンタイル:11.8

分野:Chemistry, Physical

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