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J-PARC beam commissioning progress

J-PARCビームコミッショニングの進捗状況

發知 英明  ; J-PARC Beam Commissioning Team

Hotchi, Hideaki; J-PARC Beam Commissioning Team

J-PARCは、3基の加速器群(400-MeVリナック: linac、3-GeVシンクロトロン: RCS、50-GeVシンクロトロン: MR)と3つの実験施設(物質生命科学実験施設;MLF,ハドロン実験ホール;HD,ニュートリノビームライン;NU)からなる大強度陽子加速器施設であり、1MW級の出力ビームパワーの実現を目指している。現状のユーザー運転時の出力ビームパワーは、210kW(RCS), 145kW(MR)であり、さらなる出力パワー増強のための各種ビーム試験が、各ランごとに実施されている。本会議では、RCSでのペイント入射法を用いたビーム損失低減など、最近のJ-PARC加速器のビームコミッショニングの進展状況や今後のビーム増強の見通し等を報告する。

The J-PARC is a multi-purpose proton accelerator facility amiming at MW-class output beam power, consisting of a 400 MeV H$$^{-}$$ linac, a 3-GeV RCS, a 50-GeV MR (Main Ring) and three experimental facilities, the MLF (materials and life science experimental facility), the HD (hadron experimental hall) and the NU (neutrino beam line). The J-PARC beam commissioning started in November 2006 from the linac to the downstream facilities. The current output beam power from the RCS to the MLF users is 210 kW, and the MR delivers 145 kW beam to the NU by fast extraction and a few kW beam to the HD by slow extraction. In this talk, we present a current status of the J-PARC beam commissioning, in which a recent progress in the course of the RCS beam power ramp-up scenario will be described in more detail. This talk will focus on the issues (including beam dynamics), challenges, solutions, and lessons learned during the commissioning and user operation of J-PARC and future plans.

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