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Report No.
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Thermal deformation of magnetic alloy cores for J-PARC RCS RF cavities

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

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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