TUP072 　光源加速器　 8月9日 コンベンションホール 13:10 - 15:10

Tuneable quasi-monochromatic coherent THz radiation source development

○Alexander Aryshev, Yosuke Honda (High Energy Accelerator Research Org.), Konstantin Lekomtsev (John Adams Institute at Royal Holloway, University of London), Gennadiy Naumenko, Alexander Potylitsyn (Tomsk Polytechnic University), Mikhail Shevelev (High Energy Accelerator Research Org.), Leonid Sukhih (Tomsk Polytechnic University), Nobuhiro Terunuma, Junji Urakawa (High Energy Accelerator Research Org.)

The motivation for developing an intensive THz source at KEK LUCX is coming from the growing interest to THz radiation from various scientific communities worldwide including chemistry, biology, genetics and many more. High gradient photo-cathode RF gun and few tens of femto-second laser system is used to generate a pre-bunched electron beam of a few hundred femto-seconds. We have started to investigate the production of the intense radiation beams in the range of 0.1-5 THz based on Coherent Smith-Purcell Radiation (CSPR) in “super-radiant” regime on a 8 MeV and 30 MeV electron beam at KEK LUCX accelerator respectively. 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 become 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 report the status of the experiment, CSPR basic properties and electron beam characterization will be presented.