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Generation of Terahertz Waves Using Ultrashort Electron Beams from a Photocathode Radio‐Frequency Gun Linac
Author(s) -
KAN KOICHI,
YANG JINFENG,
OGATA ATSUSHI,
KONDOH TAKAFUMI,
GOHDO MASAO,
SHIBATA HIROMI,
YOSHIDA YOICHI
Publication year - 2016
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.11767
Subject(s) - photocathode , terahertz radiation , electron gun , physics , optics , linear particle accelerator , cherenkov radiation , femtosecond , electron , picosecond , electromagnetic radiation , optoelectronics , cathode ray , laser , beam (structure) , nuclear physics , detector
SUMMARY Ultrashort (picosecond or femtosecond) electron beams are useful for electromagnetic radiation production in the terahertz (THz) range because the inverse of a 1 ps bunch length corresponds to a frequency of 1 THz. The electron beams were generated by a photocathode radio‐frequency (RF) gun linac. Electron beams with an energy of about 4 MeV at the RF gun exit were accelerated to about 30 MeV in a linac. The accelerated electron beams were compressed by a magnetic bunch compressor, resulting in femtosecond pulse width. THz radiation of the order of 0.1 THz based on coherent Cherenkov radiation (CCR) using hollow dielectric tubes and Smith−Purcell radiation (SPR) using a metallic grating or metasurface are described.