Three-dimensional simulation of long-wavelength free-electron lasers with helical wiggler and ion-channel guiding

doi:10.1088/1674-1056/22/7/074102

中国物理B ›› 2013, Vol. 22 ›› Issue (7): 74102-074102.doi: 10.1088/1674-1056/22/7/074102

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Three-dimensional simulation of long-wavelength free-electron lasers with helical wiggler and ion-channel guiding

F. Jafari Bahman, B. Maraghechi

Department of Physics, Amirkabir University of Technology, Tehran 15916-34311, Iran

收稿日期:2012-05-11 修回日期:2012-08-14 出版日期:2013-06-01 发布日期:2013-06-01

Three-dimensional simulation of long-wavelength free-electron lasers with helical wiggler and ion-channel guiding

F. Jafari Bahman, B. Maraghechi

Department of Physics, Amirkabir University of Technology, Tehran 15916-34311, Iran

Received:2012-05-11 Revised:2012-08-14 Online:2013-06-01 Published:2013-06-01
Contact: F. Jafari Bahman E-mail:jafary_bahman@yahoo.com

摘要/Abstract

摘要： A three-dimensional simulation of a steady-state amplifier model of a long-wavelength free-electron laser (FEL) with realizable helical wiggler and ion-channel guiding is presented. The set of coupled nonlinear differential equations for electron orbits and fields of TE₁₁ mode in a cylindrical waveguide are solved numerically by Runge-Kutta algorithm with averages calculated by the Gaussian quadrature technique. Self-fields and space-charge effects are neglected, and the electron beam is assumed to be cold and slippage is ignored. The parameters correspond to the Compton regime. Evolution of the radiation power and growth rate along the wiggler is studied. Ion-channel density is chosen to obtain optimum efficiency. Simulations are preformed for the FEL operating in the neighborhood of 35 GHz and 16.5 GHz for the electron beam energies of 250 keV and 400 keV, respectively. The result of the saturated efficiency was found to be in good agreement with the simple estimation based on the phase-trapping model.

关键词: free-electron laser, helical wiggler, ion-channel guiding

Abstract: A three-dimensional simulation of a steady-state amplifier model of a long-wavelength free-electron laser (FEL) with realizable helical wiggler and ion-channel guiding is presented. The set of coupled nonlinear differential equations for electron orbits and fields of TE₁₁ mode in a cylindrical waveguide are solved numerically by Runge-Kutta algorithm with averages calculated by the Gaussian quadrature technique. Self-fields and space-charge effects are neglected, and the electron beam is assumed to be cold and slippage is ignored. The parameters correspond to the Compton regime. Evolution of the radiation power and growth rate along the wiggler is studied. Ion-channel density is chosen to obtain optimum efficiency. Simulations are preformed for the FEL operating in the neighborhood of 35 GHz and 16.5 GHz for the electron beam energies of 250 keV and 400 keV, respectively. The result of the saturated efficiency was found to be in good agreement with the simple estimation based on the phase-trapping model.

Key words: free-electron laser, helical wiggler, ion-channel guiding

中图分类号: (Free-electron lasers)

41.60.Cr

42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation) 42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 02.60.Cb (Numerical simulation; solution of equations)

F. Jafari Bahman, B. Maraghechi. Three-dimensional simulation of long-wavelength free-electron lasers with helical wiggler and ion-channel guiding[J]. 中国物理B, 2013, 22(7): 74102-074102.

F. Jafari Bahman, B. Maraghechi. Three-dimensional simulation of long-wavelength free-electron lasers with helical wiggler and ion-channel guiding[J]. Chin. Phys. B, 2013, 22(7): 74102-074102.

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Three-dimensional simulation of long-wavelength free-electron lasers with helical wiggler and ion-channel guiding

Three-dimensional simulation of long-wavelength free-electron lasers with helical wiggler and ion-channel guiding

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