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Report No.
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Beam test of a new RFQ for the J-PARC linac

Kondo, Yasuhiro ; Morishita, Takatoshi ; Yamazaki, Saishun; Hori, Toshihiko; Sawabe, Yuki; Takagi, Akira*

We performed a beam test of a new 324-MHz 3-MeV H$$^{-}$$ RFQ (RFQ III) for the beam-current upgrade of the J-PARC linac. RFQ III is the first RFQ developed to meet the requirement of the J-PARC linac. The peak beam current is 50 mA, pulse length is 500 micro-sec, and the repetition is 25 Hz. Prior to the installation to the accelerator tunnel in summer of 2014, we constructed a test stand for off line testing of the new ion source and RFQ. Basic performances of RFQ III such as transmission and emittances were measured. In this paper, the beam test results are presented.

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