Experimental results of the shift bump magnet in the J-PARC 3-GeV RCS

J-PARC 3-GeV RCSの使用するバンプ電磁石の実験研究結果

高柳 智弘   ; 植野 智晶; 入江 吉郎; 金正 倫計  ; 竹田 修; 山崎 良成; 吉本 政弘  ; 神谷 潤一郎   ; 渡辺 真朗  ; 倉持 勝也

Takayanagi, Tomohiro; Ueno, Tomoaki; Irie, Yoshiro; Kinsho, Michikazu; Takeda, Osamu; Yamazaki, Yoshishige; Yoshimoto, Masahiro; Kamiya, Junichiro; Watanabe, Masao; Kuramochi, Masaya

シフトバンプ電磁石は入射軌道を生成する電磁石である。入射ビームを短い時間(500マイクロ秒)で精度よくコントロールするために、広い有効磁場領域を必要とする。電磁石の構造は、3次元磁場解析ソフトと構造解析ソフトを用いて設計を行った。電磁石の積分磁場をロングサーチコイルで測定し、また、各部の発熱温度を24時間運転を行い測定した。測定の結果は、計算の結果と良い一致を示した。

The shift bump magnet produces a fixed main bump orbit to merge the injection beam into the circulating beam. In order to control the injection beam for the short injection time (500 microseconds) with sufficient accuracy, the shift bump magnet needs a wide uniform magnetic field and the high speed exciting pattern of the high current. The magnetic field design and the structural analysis of the shift bump magnet have been performed using the three-dimensional electromagnetic analysis code and the mechanical analysis code, respectively. The magnetic field distributions were measured with a long search coil, thus giving a BL product over the magnet gap area. The temperature distributions at the various points of the magnet were measured by the thermocouples over 24 hours till they saturated. General trend of these measurements agrees well with calculations.