Nakajyo, T.

Paper	Title	Page
MOOAC02	A Short-Pulse Hard X-ray Source with Compact Electron LINAC Via Laser-Compton Scattering for Medical and Industrial Radiography	121
	H. Toyokawa, H. Ikeura-Sekiguchi, M. K. Koike, R. Kuroda, H. Ogawa, N. Sei, M. Tanaka, K. Y. Yamada, M. Y. Yasumoto AIST, Tsukuba, Ibaraki T. Nakajyo, F. Sakai, T. Y. Yanagida SHI, Tokyo
	An intense, quasi-monochromatic hard X-ray beam has been generated via the laser-Compton scattering of a picosecond electron bunch with an intense femtosecond TW laser. A s-band linear accelerator of 40 MeV and Ti:Sa femtosecond TW laser were used to generate X-rays. We plan to increase the X-ray yield up to two-orders than the current one until FY2008. Our recent R&D for that purpose are generation of multi-pulse electron beam using a photo-cathode rf-gun, and multi-pulse laser cavity for Compton scattering. We briefly describe the specifications of the electron accelerator and the laser systems, together with the developments and modifications being undergone.
	Slides
TUPMN051	Development of Photocathode RF Gun and Laser System for Multi-collision Laser Compton Scattering	1037
	R. Kuroda, M. K. Koike, H. Ogawa, N. Sei, H. Toyokawa, K. Y. Yamada, M. Y. Yasumoto AIST, Tsukuba, Ibaraki T. Gowa, Y. Kamiya, A. Masuda, R. Moriyama, K. Sakaue, M. Washio RISE, Tokyo S. Kashiwagi ISIR, Osaka T. Nakajyo, F. Sakai, T. Y. Yanagida SHI, Tokyo
	A compact soft and hard X-ray source via laser Compton scattering is required for biological, medical and industrial science because it has many benefits about generated X-rays such as short pulse, quasi-monochromatic, energy tunability and good directivity. Our X-ray source is conventionally the single collision system between an electron pulse and a laser pulse. To increase X-ray yield, we have developed a multi-collision system with a multi-bunch electron beam and a laser optical cavity. The multi-bunch beam will be generated from a Cs-Te photocathode rf gun sytem using a multi-pulse UV laser. The laser optical cavity will be built like the regenerative amplification including a collision point between the electron pulse and the laser pulse to enhance the laser peak power per 1 collision on laser Compton scattering. In this conference, we will describe the results of preliminary experiments for the multi-collision system and future plans.