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Report No.

Status of mass production of the ACS cavity for the J-PARC linac energy upgrade

Ao, Hiroyuki; Asano, Hiroyuki; Ouchi, Nobuo ; Tsubota, Naoaki; Hasegawa, Kazuo; Hirano, Koichiro ; Morishita, Takatoshi ; Takata, Koji*; Naito, Fujio*; Yamazaki, Yoshishige

The mass production of the ACS (Annular-ring Coupled Structure) cavity started from March 2009 for the J-PARC linac energy upgrade from 181 MeV to 400 MeV. This upgrade project requires 18 ACS accelerating modules and two debunchers additionally within three years. The schedule is so tight that we have to optimize the fabrication process. Thus the test cells were fabricated for the all geometrical beta before the mass production to confirm the initial design and the frequency tuning procedure. This paper describes our approach for the mass production and the current status.



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