WEP118 　加速器技術／レーザー　 8月5日 小ホール 13:00 - 15:00

Progress towards table-top pre-bunched THz FEL and its application to soft X-ray generation via inverse Compton scattering

○Alexander Aryshev, Mikhail Shevelev, Konstantin Lekomtsev, Masafumi Fukuda, Yosuke Honda, Nobuhiro Terunuma, Junji Urakawa (KEK)

The motivation for developing a linac-based THz source at KEK LUCX is coming from the growing interest to THz radiation and a possibility to utilize it soft X-ray production via inverse Compton scattering. We have proposed two approaches to produce the intense radiation beams in the range of 0.1-5 THz based on Coherent Smith-Purcell Radiation and Coherent Undulator Radiation in “super-radiant” regime on a 8 MeV and 30 MeV electron beam at KEK LUCX accelerator respectively. First radiation type is generated when a charged particle moves in the vicinity of a periodical pattern or grating. When radiation wavelength is comparable to or longer than the bunch length it become coherent. Similar radiation enhancement is happening when micro-bunch period coincided with undulator period. To produce such a micro-bunch train of electrons a new Ti:Sa laser system for LUCX RF Gun has been developed and electron micro-train has been confirmed. In this report the status of the experiment, Ti:Sa laser system modification, CSPR and CUR basic properties and electron beam characterization will be presented. The maximum achievable THz power from both approaches will also be discussed