Systematic calibration of beam position monitor at J-PARC LINAC

Sato, Susumu  ; Tomisawa, Tetsuo ; Hiroki, Fumio ; Lee, S.*; Igarashi, Zenei*; Ikegami, Masanori*; Ueno, Akira  ; Kondo, Yasuhiro   ; Hasegawa, Kazuo; Toyama, Takeshi*; Kishiro, Junichi; Kamikubota, Norihiko*; Takagi, Makoto*; Tanaka, Mikio*; Akikawa, Hisashi; Sakaki, Hironao; Yoshikawa, Hiroshi

As a joint project of KEK and JAERI, a MW class of high intensity proton accelerator (J-PARC), consisting of Linac, 3 GeV-RCS, 50 GeV-MR, is under construction. For this accelerator, it is required to minimize the beam loss (typically, lower than0.11 W/m at the linac). To achieve the requirement, beam trajectory needs to be controlled with accuracy of some 100 m. The first stage of the acceleration (up to 181 MeV during the first stage of construction) is done by linac. The beam position monitor (BPM) in the linac utilizes 4 stripline pickups (50 ohm) on the beam transportation chamber. In this paper, systematic calibration of the BPM is described.