KEK has been constructing the Superconducting RF Test Facility (STF) with aiming at a center of the ILC-R&D in Asia from 2005. In this project, KEK targets manufacturing and operational experiences of the RF cavity and cryomodule toward the ILC, and two cryomodules have been developed. These cryomodules are 6 meter long and have 4 nine-cell cavities in each cryostat. The designs of the cryomodules are based on the TESLA Type-3 (TTF-3) at DESY, however, each cryostat has the different type of cavities, TESLA-like type and Low-Loss type. The tests of the cryomodules were performed in two steps. In the first test, measurements of the cryogenic performances of these cryomodules were the main objective. One nine-cell cavity was assembled in each cryomodule and cool-down of the two cryomodules was performed, individually. In the second test, the four TESLA-like cavities were assembled in the cryomodule as complete integration. Cool-down of the cryomodule to 2K was successfully completed, and thermal performances of the cryomodule and cooling capacity of the cryogenics system were studied in detail. In this paper, we will report the design of the cryomodules and the thermal performances at these cold tests.

Recent rapid developments of laser and semiconductor technologies have promoted new Terahertz (THz) radiation sources and measurement techniques. THz technology can be now found in various fields of application. On the other hand, accelerator-based radiation sources have been developed in order to create novel aspects of THz science. Prospect is discussed by showing possible THz sources.

The first stage building of a new accelerator facility of Center for Accelerator and Beam Applied Science has been built on Ito Campus of Kyushu University. The 150 MeV FFAG accelerator has been transported from KEK to Ito Campus as a main accelerator of the facility. Beam commissioning of the injector cyclotron has successfully been performed in October 2008.

On September 10th, the first beam was successfully circulated in the 26.7 km-long LHC ring. This historic event was performed in a very open environment. TV crews were in the CERN accelerator control room. More than one hundred million people around the world watched spots in the beam monitors. At KEK, we organized a press conference in the day before, with a high-quality video connection to CERN. In this report, we will describe how the events were organized.

At J-PARC, beam commissioning of Materials and Life Science Experimental Facility (MLF) has been started in May 2008. With only one shot of the proton beam, we succeeded to deliver the proton beam to the neutron production target because of the good preparation of the monitor and the magnet. We also succeeded, by the only one shot of the beam, to recognize that the observed performance of the neutron beam agreed well with the design. Furthermore, we successfully produced the muon beam, so that the fundamental mission of MLF as a secondary beam supplier was completed. In December 2008, MLF was opened for users to use the neutron and the muon beam.

An international collaboration on the CESR-TA (Cornell Electron Storage Ring—Test Accelerator) program, which is a program to investigate electron cloud instability (ECI) issues in the positron damping ring of the ILC (International Linear Collider), is currently underway at Cornell University. KEK is supporting the program through the development of an X-ray beam profile monitor system to measure the extremely small beam size, and through the development of clearing electrodes to mitigate the ECI.

ILC08 (International Linear Collider-ILC-Accelerator workshop) and LCWS (ILC physics and detector workshop) were held together at University of Illinois, Chicago. More than 300 researchers participated from all over the world. Here, we report on research and development of ILC accelerator.