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Condition of MA cut cores in the RF cavities of J-PARC main ring after several years of operation

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

J-PARC 3 GeV Rapid Cycling Synchrotron (RCS) and 50 GeV Synchrotron (MR) employ the Magnetic Alloy (MA) loaded RF cavities. We observed the impedance reductions of MR RF cavities. Opening the RF cavities, we found that the impedance reductions were caused by the corrosion on the core cutting surfaces. The copper ions in the cooling water from hollow conductors of main magnets might accelerate the corrosion process.

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