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Report No.
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Online monitoring of the H0 dump beam current during user operation of J-PARC RCS

Hatakeyama, Shuichiro; Saha, P. K.   ; Yoshimoto, Masahiro  ; Yamamoto, Kazami   ; Hayashi, Naoki  ; Sato, Kenichiro*

In J-PARC (Japan Proton Accelerator Research Complex), the negative hydrogen ions (H$$^{-}$$) accelerated by LINAC are converted to protons (H$$^{+}$$) by the Charge Stripping Foil before injecting into RCS (Rapid Cycling Synchrotron). About 99.7% of H$$^{-}$$ are stripped it's two electrons by the 1st foil. The rest of H0 and H$$^{-}$$ are converted to H$$^{+}$$ by 2nd and 3rd foils and abandoned into H0 dump. Monitoring of the fraction of beam current into the H0 dump gives useful information for the stable beam supply during accelerator user's operation. This report describes the method of online monitoring to estimate the beam current of the H0 dump line.

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