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Effects of Optical Guiding in a 1D Time-Dependent Free-Electron Laser
New Phys.: Sae Mulli 2017; 67: 1388~1392
Published online November 30, 2017;
© 2017 New Physics: Sae Mulli.

Soon-Kwon NAM*

Department of Physics, Kangwon National University, Chunchon 24341, Korea
Correspondence to:
Received July 17, 2017; Revised July 25, 2017; Accepted July 26, 2017.
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 effects of optical guiding in a free-electron laser oscillator. We have developed an extended one-dimensional time-dependent free-electron laser (1D time-dependent FEL) code to study the effects of optical guiding for a FEL with a wiggler length of 2 m and an electron beam energy of 50 MeV. The amplitude of the emitted radiation field for radiation wavelengths from 2.45 $\mu$m to 2.65 $\mu$m are calculated for times $t$ = 3.0 $\mu$s and 5 $\mu$s. The gain of the radiation for radiation wavelengths of 2.557 $\mu$m and 2.565 $\mu$m with detuning for various times and pulse shapes of the emitted field's amplitude for passes are studied using an extended 1D time-dependent FEL code with optical guiding. The gain of the radiation without optical guiding for wave-number shifts $dk/k$ = $-$0.5 and $dk/k$ = +0.5 are calculated for the radiation wavelength of 2.561 $\mu$m. The results are compared to those for the amplitude of the emitted field of the radiation with optical guiding for various times by using a 1D time-dependent FEL code that we developed.
PACS numbers: 41.60.Cr
Keywords: Free-electron laser, Time-dependent code, Optical guiding, Gain

March 2018, 68 (3)
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