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Report No.

The Origin of magnetic alloy core buckling in J-PARC 3 GeV RCS

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

We have been operating ten RF cavities loaded with magnetic alloy cores in J-PARC 3 GeV RCS since September 2007. During 3 years operation, we detected three times the impedance reductions of RF cavities resulting from the buckling of MA cores. To find out the origin of the MA core buckling, we evaluated the thermal stress inside the MA cores in operation and studied the relationship between the MA core buckling and core structure. We figured out that the MA core buckling was caused by the thermal stress that was enhanced due to the impregnation with low viscosity epoxy resin.



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Category:Instruments & Instrumentation



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