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Report No.

The Path to 1 MW; Beam loss control 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   ; Yamamoto, Masanobu   ; Yoshimoto, Masahiro  

The J-PARC 3-GeV RCS has 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. In the beam test in October 2015, we successfully minimized space-charge induced beam loss by optimizing the injection painting technique, as well as suppressed beam instability by controlling the tune and the chromaticity. In addition, in the recent beam test, the transverse painting area was successfully expanded by introducing both quadrupole correctors and anti-correlated painting scheme, by which a foil scattering part of beam loss during charge-exchange injection was further reduced. By such recent efforts, the 1-MW beam operation is now estimated to be established within a permissible beam loss level. In this talk, recent progresses of RCS beam commissioning are reported with particular emphasis on our approaches to beam loss issues.



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