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https://doi.org/10.3938/NPSM.69.951
Effects of Betatron-Synchrotron Oscillations in a Free-Electron Laser
New Phys.: Sae Mulli 2019; 69: 951~956
Published online September 30, 2019;  https://doi.org/10.3938/NPSM.69.951
© 2019 New Physics: Sae Mulli.

Soon-Kwon NAM*, Yun Seong PARK

Department of Physics, Kangwon National University, Chunchon 24341, Korea
Correspondence to: snam@kangwon.ac.kr
Received July 8, 2019; Revised August 14, 2019; Accepted August 15, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
We have analyzed the characteristics of betatron-synchrotron oscillations in a free-electron laser oscillator. We have developed a three-dimensional time-dependent free-electron laser (3D time-dependent FEL) code including the effects of betatron-synchrotron oscillations in a free-electron laser oscillator with a wiggler period of 0.02~m, a wiggler length of 2~m, an electron beam energy of 13.4~MeV and an electron beam current of 75~A. The total power of the radiation with and without betatron-synchrotron oscillations for a normalized emittance of 10 mm$\cdot$mrad was investigated by using the time-dependent FEL code, as were the propagations of the beam in the $x$ and the $y$ directions with betatron-synchrotron oscillation for a normalized emittance of 10 mm$\cdot$mrad. The results were compared to those without betatron-synchrotron oscillations the particle distributions with betatron-synchrotron oscillations for a radiation wavelength of 38 $\mu$m and a normalized emittance of 10mm $\cdot$mrad were also calculated by using the 3D time-dependent FEL code that we had developed, and the results were compared to those without betatron-synchrotron oscillations.
PACS numbers: 41.60.Cr
Keywords: Total power, Betatron-synchrotron oscillations, Propagation of the beam


September 2019, 69 (9)
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