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Thermal deformation of magnetic alloy cores for J-PARC RCS RF cavities

J-PARC用3GeVシンクロトロン用高周波加速空胴用金属磁性体コアの熱変形

島田 太平 ; 山本 昌亘   ; 野村 昌弘  ; Schnase, A.; 田村 文彦   ; 原 圭吾*; 長谷川 豪志*; 大森 千広*; 戸田 信*; 吉井 正人*; 鈴木 寛光

Shimada, Taihei; Yamamoto, Masanobu; Nomura, Masahiro; Schnase, A.; Tamura, Fumihiko; Hara, Keigo*; Hasegawa, Katsushi*; Omori, Chihiro*; Toda, Makoto*; Yoshii, Masahito*; Suzuki, Hiromitsu

J-PARC 3GeVシンクロトロン 高周波加速空胴用金属磁性体には、運転によって座屈や変形が生じている。その原因を探るべく、大気中において高周波加熱を行い、コアの製造方法と熱変形の関係を調査した。その結果を報告する。

Several magnetic alloy cores of the RF cavities, which are installed in the 3 GeV rapid cycling synchrotron (RCS) of J-PARC have shown buckling after about two years operation. To find the reason, why the local deformation happened, we made a test setup. There we heat up MA cores in air by 500 kHz RF and measure the thermal deformation in order to collect information about the buckling process. The results obtained by comparing the expansion of cores made by different production methods are reported.

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