STATUS OF THE 9-CELL SUPERCONDUCTING CAVITY R&D FOR ILC

Hitachi is developing 9-cell superconducting cavities for ILC project in collaboration with KEK. In 2010, Hitachi’s first 9-cell cavity without HOM couplers was completed successfully. Surface treatments and performance test of the cavity were carried out at KEK and its accelerating gradient reached 35.2MV/m. We have undertaken our next 9-cell cavity with HOM couplers since January 2011. This paper outlines the fabrication flow and test result of our first cavity, and describes a current status of next cavity briefly.