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Space charge simulation and matching at low energy section of J-PARC LINAC

J-PARC線形加速器の低エネルギー部分の空間電荷シミュレーションとマッチング

Artikova, S.; 近藤 恭弘; 森下 卓俊

Artikova, S.; Kondo, Yasuhiro; Morishita, Takatoshi

An intensity upgrade of J-PARC included the installation of a new IS and a RFQ which to be used at first stage of acceleration. The linac is divided into 2 sections on the basis of operating frequencies and 3 sections on the basis of family of RF cavities to be used for the acceleration of 50 mA H$$^{-}$$ beam from 50 keV to 400 MeV. Low energy part of linac consists of an IS, a 2-solenoid beam transport and RFQ. The transition from one section to another can limit the acceptance of the linac if these are not matched properly in both longitudinal and transverse plane. We have calculated the acceptance of the RFQ at zero current, then a particle tracking technique is employed to study the space charge effects in LEBT of the J-PARC linac after the intensity upgrade in order to match the beam to the RFQ. Also, RFQ tank level and intervene voltage calibration factor is determined by comparing the simulation results of the beam transmission with the test measurement of tank level vs. transmission.

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