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Radiation Intensity in a Free-electron Laser with Three-section Wiggler
New Phys.: Sae Mulli 2019; 69: 964~968
Published online September 30, 2019;
© 2019 New Physics: Sae Mulli.

Soon-Kwon NAM*, TaeHoon KIM

Department of Physics, Kangwon National University, Chuncheon 24341, Korea
Correspondence to:
Received July 8, 2019; Revised August 7, 2019; Accepted August 7, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We have analyzed the radiation intensity in a free-electron laser with a three-section wiggler. We have developed a time-dependent free-electron laser (time-dependent FEL) multi-particle tracking code for a free-electron laser oscillator with a total wiggler length of 3~m. The wiggler consist of the first wiggler with a length of 0.4 m, the second wiggler with a length of 0.6 m, the third wiggler with a length of 1.0 m and a drift space length of 0.5 m. The radiation intensity for the time range from -10 $\mu$m to 10 $\mu$m and for various detuning parameters was found to be optimized at a detuning parameter of 0.48%. The radiation intensity for the wavelength range from 2.484 $\mu$m to 2.612 $\mu$m and for various times was also found to be optimized at a detuning parameter at 0.48\% and $t$ = 2.0 $\mu$m by using the extended time-dependent FEL code that we had developed.
PACS numbers: 41.60.Cr
Keywords: Three-section wiggler, Time-dependent code, Optimization of beam parameters

September 2019, 69 (9)
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