Improvement of the longitudinal phase space tomography at the J-PARC synchrotrons

Okita, Hidefumi  ; Tamura, Fumihiko   ; Yamamoto, Masanobu   ; Nomura, Masahiro  ; Shimada, Taihei ; Saha, P. K.   ; Yoshii, Masahito*; Omori, Chihiro*; Sugiyama, Yasuyuki*; Hasegawa, Katsushi*; Hara, Keigo*; Albright, S.*; Kelliher, D. J.*

Longitudinal phase space tomography is an effective measurement tool for acquiring the longitudinal phase space distribution. For the J-PARC synchrotrons, tomography, which can take into account the beam dynamics such as longitudinal space charge effect and nonlinearity, is desired, as the beam power increases. In this study, for the J-PARC synchrotron, the CERN's tomography, which employs the hybrid algorithm that can consider the beam dynamics for reconstruction, is introduced and benchmarked. The benchmark results show that the CERN's tomography has the ability to measure the longitudinal phase space distribution accurately, in the high-power beam operation at the J-PARC synchrotrons.