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Development of RF chopper system at J-PARC Linac, 2

Hirano, Koichiro ; Kondo, Yasuhiro ; Kawane, Yusuke; Shinozaki, Shinichi ; Miura, Akihiko ; Morishita, Takatoshi ; Sawabe, Yuki; Sugimura, Takashi*; Naito, Fujio*; Fang, Z.*; Fukui, Yuji*; Futatsukawa, Kenta*; Maruta, Tomofumi*; Miyao, Tomoaki*

Two RF-deflecting cavities as a chopper and a beam scraper have been used in the MEBT1 between a 324 MHz RFQ and a 50-MeV DTL of the J-PARC Linac. We replaced with a newly fabricated RF chopper to decrease beam loss for the operation with 50 mA. We installed two new scrapers to absorb the higher power of the deflected beam by the RF chopper. This paper describes the RF chopper system and beam irradiation test results of the scraper.

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