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Reduction of outgassing for suppressing electrical breakdown in the kicker magnet of J-PARC RCS

J-PARC RCSキッカー電磁石のアウトガス低減による放電抑制

神谷 潤一郎   ; 金正 倫計  ; 荻原 徳男; 倉持 勝也; 植野 智晶; 高柳 智弘   ; 竹田 修; 渡辺 真朗  ; 山崎 良雄 ; 吉本 政弘  

Kamiya, Junichiro; Kinsho, Michikazu; Ogiwara, Norio; Kuramochi, Masaya; Ueno, Tomoaki; Takayanagi, Tomohiro; Takeda, Osamu; Watanabe, Masao; Yamazaki, Yoshio; Yoshimoto, Masahiro

J-PARC RCSにおける3GeVビーム取出し用キッカー電磁石は数10kVもの高電圧がかかるパルス電磁石である。そのため電磁石全体が真空中に設置される。その際にいかにして放電を防ぐかが、安定して長期的に電磁石を運転するうえで重要となる。本論文では、放電を防ぐために施されたキッカー電磁石の構造の改善、及び部材段階からの徹底したアウトガス低減による放電抑制の結果について報告する。

Kicker magnets in Rapid Cycling Synchrotron (RCS) of Japan Proton Accelerator Research Complex (J-PARC) are now under construction. The kicker magnets are short pulse magnets with high charging voltage of 60 kV or more which is installing in vacuum chambers. The kicker magnet mainly consists of aluminum alloy as electric plates and ferrite as magnetic cores. The outgas reduction from those components is very important to prevent not only electrical discharge but also interaction between the proton beam and residual gas in the vacuum. We thoroughly reduced the outgas from the components. Surface of the aluminum alloy was finished by pit-free electropolishing. Aluminum and ferrites were baked in vacuum before construction of the magnet. They were baked each other until water, which was the main component of outgas, was reduced. We will discuss the effects of above processes on the discharge in the vacuum.

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