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Particles 2019, 2(1), 32-43; https://doi.org/10.3390/particles2010003

Investigation of Bunch Compressor and Compressed Electron Beam Characteristics by Coherent Transition Radiation

1
Plasma and Beam Physics Research Facility, Chiang Mai University, Chiang Mai 50200, Thailand
2
Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
*
Author to whom correspondence should be addressed.
Received: 31 October 2018 / Revised: 23 December 2018 / Accepted: 25 December 2018 / Published: 31 December 2018
(This article belongs to the Special Issue Superradiances from Ultra Short Electron Bunch Beam)
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Abstract

A magnetic chicane bunch compressor for a new compact accelerator-based terahertz (THz) radiation source at the Institute of Advanced Energy, Kyoto University, was completely installed in March 2016. The chicane is employed to compress an electron bunch with an energy of 4.6 MeV generated by a 1.6-cell photocathode radio frequency (RF)-gun. The compressed bunch is injected into a short planar undulator for THz generation by coherent undulator radiation (CUR). The characteristics of the bunch compressor and the compressed bunch were investigated by observing the coherent transition radiation (CTR). The CTR spectra, which were analyzed by using a Michelson interferometer, and the compressed bunch length were also estimated. The results were that the chicane could compress the electron bunch at a laser injection phase less than 45 degrees, and the maximum CTR intensity was observed at a laser injection phase around 24 degrees. The optimum value of the first momentum compaction factor was around −45 mm, which provided an estimated rms bunch length less than 1 ps. View Full-Text
Keywords: coherent transition radiation; magnetic bunch compressor; electron bunch length coherent transition radiation; magnetic bunch compressor; electron bunch length
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Suphakul, S.; Zen, H.; Kii, T.; Ohgaki, H. Investigation of Bunch Compressor and Compressed Electron Beam Characteristics by Coherent Transition Radiation. Particles 2019, 2, 32-43.

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