Progress of STF accelerator development for ILC

The STF (Superconducting RF Test Facility) accelerator is a test linear accelerator using superconducting cavities (SC cavities) and cryomodules of ILC (the International Linear Collider) design. The injector of the STF accelerator consists of the L-band photocathode RF-gun (normal-conducting cavity), two superconducting 9-cell cavities for pre-acceleration of electron beam to 40 MeV. The 12m-cryomodule (8 SC cavities and 1 SC quadrupole magnet with beam position monitor and 6m-cryomodule (4 SC cavities) are followed after the injector. They will be powered by 10 MW multi-beam klystron and the distribution wave-guide system. The accelerator field and phase in the SC cavities are controlled precisely by the fast digital feedback at low-power level. The recent developments of the STF accelerator such as cryomodules performance test results, high power components development, are discussed and summarized in this paper. (author)