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Study for RF chopper cavities at J-PARC linac

Hirano, Koichiro  ; Ito, Takashi  ; Chishiro, Etsuji; Kubota, Chikashi*; Nammo, Kesao*; Kobayashi, Tetsuya*; Naito, Fujio*

Two RF-deflecting cavities as the chopper have been used in the MEBT between a 324 MHz RFQ and a 50-MeV DTL of the J-PARC Linac. A fast rise/fall time of the pulse is a fundamental requirement to minimize any beam losses due to insufficient deflection to some beam bunches during the transient time. We have studied the RF chopper cavity to speed up the transient time. This paper describes the design of the new RF chopper by using HFSS code.

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