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Advanced uses of a current transformer and a mult-wire profile monitor for online monitoring of the stripper foil degradation in the 3-GeV RCS of J-PARC

J-PARC 3GeV RCSにおける荷電変換膜劣化の常時監視に向けた電流モニタとマルチワイヤープロファイルモニタの先進的な使用法

Saha, P. K.   ; 原田 寛之  ; 畠山 衆一郎; 林 直樹  ; 發知 英明  ; 金正 倫計  ; 岡部 晃大  ; 佐伯 理生二; 山本 風海   ; 山崎 良雄 ; 吉本 政弘  

Saha, P. K.; Harada, Hiroyuki; Hatakeyama, Shuichiro; Hayashi, Naoki; Hotchi, Hideaki; Kinsho, Michikazu; Okabe, Kota; Saeki, Riuji; Yamamoto, Kazami; Yamazaki, Yoshio; Yoshimoto, Masahiro

We have established an advanced and sophisticated uses of a current transformer and a multi-wire profile monitor for accurate measuring as well as online monitoring of the waste beam so as to know the stripper foil degradation during user operation of the J-PARC 3-GeV RCS. A sudden foil breaking is not only decreases accelerator availability but also raises maintenance issues. A proper monitoring system of the foil is thus important in order to avoid any such issues by replacing the foil with a new one in the scheduled maintenance day. A single foil was used for a continuous last 7 months operation of the RCS with an extracted beam power of 300 kW (18 kW injected beam). There were a total of 8$$times$$10E23 hit particles but there was no any degradation of the foil so far. Surprisingly an increase of the foil thickness of about 10% was observed.

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