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Optimization of the Beam Parameters in a Time-Dependent Free-Electron Laser
New Phys.: Sae Mulli 2018; 68: 1162~1166
Published online October 31, 2018;
© 2018 New Physics: Sae Mulli.

Soon-Kwon NAM*, Tae Hoon KIM

Department of Physics, Kangwon National University, Chuncheon 24341, Korea
Correspondence to:
Received July 2, 2018; Revised July 16, 2018; Accepted July 16, 2018.
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 developed an extended 3D time-dependent free-electron laser (3D time-dependent FEL) code to optimize the beam parameters in a free-electron laser oscillator. We optimized the beam parameters and the evolution of the temporal pulse in a 3-dimensional time-dependent free-electron laser oscillator by using the extended 3D time-dependent FEL code that we developed. The evolution of the temporal pulse was investigated for wiggler lengths of 0.5 m, 1.0 m, 1.5 m and 2.0 m, beam energies of 30 $\sim$ 50 MeV, beam currents of 30 $\sim$ 50 A and radiation wavelengths of 2.48 $\sim$ 2.65 $\mu$m. The gains or various radiation pulses were analyzed at various times from -1.0 $\mu$s to 1.0 $\mu$s for electron beams with energy spreads from 0.01 to 1.4%. In particular, the gain of the radiation pulse was optimized at -0.6 $\mu$s by using our newly developed extended 3D time-dependent FEL code.
PACS numbers: 41.60.Cr
Keywords: Optimization of beam parameters, 3D time-dependent code, Gain

January 2019, 69 (1)
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