Abstract
The Korea Atomic Energy Research Institute (KAERI) has used a microtron accelerator based on a thermionic cathode for operating a compact terahertz (THz) FEL, where the electrons are emitted and accelerated automatically during the radio-frequency (RF) macro-pulse over threshold power for their emission. Usually a thermionic cathode is embedded inside the microtron cavity for electron-beam emission, and at the same time acceleration is due to the input RF source. In this case, the accelerator scheme is simple, but just a fraction of the emitted electrons are accelerated, and the electron bunch length is uncontrollable due to the RF phase condition for acceleration. In this paper, a photocathode-based microtron which is able to produce high peak (∼100 A) and ultrashort (∼1 ps) electron bunch is studied to adapt it for an electron injector of a THz generator. Especially, we analyzed the electron beam dynamics along the accelerating trajectory with a 3D PIC-code to find the optimized RF phase and laser input time.
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21 October 2017
One affiliation of Sunjeong Park was omitted. It should be added as “Department of Physics, Kyungpook National University, Daegu 702-701, Korea”. Affiliation of Eun-San Kim had a typo. It should be corrected as “Department of Physics, Kyungpook National University, Daegu 702-701, Korea”.
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An erratum to this article is available at https://doi.org/10.3938/jkps.71.591.
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Park, S., Jeong, Y.U., Park, S.H. et al. Simulation on a photocathode-based microtron using a 3D PIC code. Journal of the Korean Physical Society 66, 358–363 (2015). https://doi.org/10.3938/jkps.66.358
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DOI: https://doi.org/10.3938/jkps.66.358