Analyses of the corrosion for the magnetic alloy by the coolant in the accelerator

Sato, Tomonori; Yamamoto, Masahiro; Omori, Chihiro*; Nomura, Masahiro; Tsujikawa, Shigeo*; Ogawa, Hiroyuki*; Nakajima, Hiroshi*

no journal, , 

The RF cavities used in J-PARC are heated by the applied current, and they are cooled by the circulating water. The RF cavities were made by a magnetic alloy. The corrosion of the RF cavities was observed. The analyses of the corrosion was performed. As a result, the contribution of the copper ions to the corrosion of RF cavity was confirmed. And the 40 m/year of corrosion rate was estimated in copper ion free condition.