Aryshev, Alexander

Fukuda, Masafumi

Honda, Yosuke

Shevelev, Mihail Viktorovich

Terunuma, Nobuhiro

Urakawa, Junji

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XI International Symposium RREPS-15, 6-11 September 2015, Saint Petersburg, Russia 141PROGRESS TOWARDS COMPACT PRE-BUNCHEDFEL REALIZATIONAlexander Aryshev1, Masafumi Fukuda, Mikhail Shevelev,Yosuke Honda, Nobuhiro Terunuma, Junji UrakawaHigh Energy Accelerator Research Organization (KEK), Tsukuba, JapanThe motivation for developing linac-based THz source is coming fromthe growing interest to THz radiation. High gradient photo-cathode RFgun and few tens of femtosecond laser system are used to generate a pre-bunched electron beam. We have proposed two approaches to producethe intense radiation beams in the range of 0.1-5 THz based on CoherentSmith-Purcell Radiation (CSPR) and Coherent Undulator Radiation (CUR)in “super-radiant” regime on 8 MeV and 30 MeV electron beam at KEKLUCX accelerator, respectively. CSPR is generated when a charged particlemoves in the vicinity of a periodical pattern or grating. The grating typeand period can be chosen to make quasi-monochromatic CSPR spectrum.When radiation wavelength is comparable to or longer than the bunchlength it becomes coherent and even more it enters a “super-radiant” regimeif micro-bunch spacing became comparable with radiation wavelength andcomparable to the grating period. Similar radiation enhancement can beobtained when micro-bunch period coincided with undulator period. In thisreport the status of experiment, comb electron beam generation, CSPR andCUR achievable characteristics will be discussed.This work is supported by Photon and Quantum Basic ResearchCoordinated Development Program from the Ministry of Education, Culture,Sports, Science and Technology, Japan and JSPS KAKENHI grant number23226020.1 Corresponding author: alar@post.kek.jp

Progress Towards Compact Pre-bunched FEL Realization

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