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Report No.

Recent progress of 1-MW beam tuning in the J-PARC 3-GeV RCS

Hotchi, Hideaki  ; Harada, Hiroyuki  ; Kato, Shinichi; Kinsho, Michikazu  ; Okabe, Kota  ; Saha, P. K.   ; Shobuda, Yoshihiro   ; Tamura, Fumihiko   ; Tani, Norio  ; Watanabe, Yasuhiro  ; Yamamoto, Kazami   ; Yoshimoto, Masahiro  

The J-PARC 3-GeV RCS achieved a 1-MW beam acceleration in January 2015. Since then, a large fraction of our effort has been focused on reducing and managing beam losses. Major part of beam loss, such as space-charge induced beam loss, was well minimized by introducing injection painting. Uncontrolled beam loss arising from large-angle foil scattering during charge-exchange injection was also reduced drastically by the expansion of the transverse painting area, which was achieved by introducing quadrupole correctors and anti-correlated painting. By such recent efforts, the 1-MW beam operation is now estimated to be established within a permissible beam loss level. This paper presents the recent progress of 1-MW beam tuning, especially focusing on our approaches to beam loss issues.



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