|WEOM05 電子加速器 8月2日 小講堂（１F） 10:10 - 10:30|
|Progress status of STF accelerator development for ILC|
|○Hitoshi Hayano (High Energy Accelerator Research Organization (KEK))|
The superconducting RF test facility (STF) in KEK is the facility for developing superconducting Linac technologies of the International Linear Collider (ILC). The STF accelerator is a test accelerator composed of a normal conducting photocathode RF gun, superconducting cavities and cryomodules. In 2016, the selected 8 cavities in the 12m-cryomodule and the 6m-cryomodule were combined by the waveguide system, and tested the accelerating gradient with 2K cold state. The achieved 30.5MV/m average gradient for total 8 cavities was obtained. In parallel, the MARX modulator for the multi-beam-klystron was also developed and tested, and is under improvement of pulse voltage flatness with 5MW klystron connection. In the framework of US-Japan collaboration, cost-down studies on superconducting cavities and superconductor materials aiming for more high gradient, are started mainly between KEK and FNAL. These recent new studies of the STF accelerator will be summarized and discussed in this paper.