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Impedance measurements of RF cavities in J-PARC synchrotrons

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

J-PARC 3 GeV RCS and 50 GeV MR employ the Magnetic Alloy (MA) loaded RF cavities. We observed the impedance reductions of the RF cavities in RCS three times during 3 years of operation. We figured out that the impedance reductions were resulting from the MA core buckling. We also observed the impedance reductions of MR RF cavities during 1.5 years of operation. Opening the RF cavities, we found that the impedance reductions were caused by the corrosion on the MA core cutting surface. The copper ions and colloids in the cooling water might accelerate the corrosion process.

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