Present status of S-band compact linac facility at AIST

A laser Compton scattering (LCS) X-ray, a coherent THz radiation and a short-pulse bremsstrahlung gamma-ray sources have been developed on the basis of an S-band compact linac at AIST. All of system is built in one research room about 10 meters square. The electron beam can be accelerated up to about 42 MeV using the rf source of a 20 MW klystron. The LCS X-ray source using a TW Ti:Sa laser can generate a hard X-ray pulse which has variable energy of 10 keV - 40 keV with narrow bandwidth by changing electron energy and collision angle for medical and biological applications. The coherent THz radiation source using ultra-short electron beam has been also developed instead of a conventional laser based THz source for various imaging and spectroscopy applications. The THz pulse has peak power of more than 1 kW in frequency range between 0.1-2 THz. The short-pulse bremsstrahlung gamma-ray source using a short-pulse electron beam with a W-target can generate a short-pulse gamma-ray with less than 1 ps pulse width. The gamma-ray has been applied to the photon-induced positron annihilation lifetime spectroscopy (Pi-PALS) for the defect analysis of metal materials. In this conference, we will report present status of AIST S-band compact linac and its applications. (author)