THP028 　光源加速器　 8月9日 大展示ホール 13:10 - 15:10

Investigation of coherent diffraction radiation in resonant conditions for developing of an intense monochromatic radiation source

○Alexander Aryshev, Sakae Araki (High Energy Accelerator Research Organization), Konstantin Artyumov (Tomsk Polytechnic University), Masafumi Fukuda (High Energy Accelerator Research Organization), Gennady Naumenko, Alexander Potylitsyn, Mikhail Shevelev, Leonid Sukhikh (Tomsk Polytechnic University), Nobuhiro Terunuma, Junji Urakawa (High Energy Accelerator Research Organization)

The motivation for developing intensive THz source at KEK LUCX is coming from the growing interest to THz radiation from various scientific communities worldwide. High gradient photo-cathode RF gun and few tens of femtosecond laser system are used to generate a pre-bunched electron beam of a few hundred femtoseconds. We are investigating the production of the intense radiation beams in the range of 0.1-5 THz based on Coherent Smith-Purcell Radiation, CSPR in a single bunch and micro-bunched regime of the 8 MeV electron beam at KEK LUCX accelerator. CSPR is generated when a charged particle moves in the vicinity of a periodical pattern or grating. The grating type and period can be chosen to make quasi-monochromatic CSPR spectrum. When radiation wavelength is comparable to or longer than the bunch length it becomes coherent and even more, it enters a “super-radiant” regime if micro-bunch spacing became comparable with radiation wavelength which is comparable to the grating period. In this reports the status of the experiment, CSPR basic properties, and electron beam characterization will be presented. The maximum achievable THz power from both approaches will also be discussed.