Nonlinear Simulation Of Raman Free-Electron Lasers With Axial Guide Fields

H. P. Freund

doi:10.1117/12.947121

16 February 1984 Nonlinear Simulation Of Raman Free-Electron Lasers With Axial Guide Fields

H. P. Freund

Proceedings Volume 0453, Free-Electron Generators of Coherent Radiation; (1984) https://doi.org/10.1117/12.947121
Event: Free-Electron Generators of Coherent Radiation, 1983, Orcas Island, United States

Abstract

The nonlinear evolution of Raman free-electron lasers in the presence of an axial guide-field is investigated numerically in an amplifier configuration. The nonlinear currents which mediate the interaction are computed by means of an average over particle phases, and the inclusion of fluctuating space-charge fields in the formulation permits the investigation of both the stimulated Raman and Compton scattering regimes. Initial conditions are chosen to describe the injection of a monoenergetic beam into the interaction region composed of a uniform axial guide field and a helical wiggler field which increases adiabatically to a constant level. After an initial transient phase, the results show a region of exponential growth of the radiation field which is in excellent agreement with linear theory. Saturation occurs by means of particle trapping. The efficiency of the interaction has been studied for a wide range of axial guide fields, and substantial enhancements have been found relative to the zero-guide-field limit.

Citation Download Citation

H. P. Freund "Nonlinear Simulation Of Raman Free-Electron Lasers With Axial Guide Fields", Proc. SPIE 0453, Free-Electron Generators of Coherent Radiation, (16 February 1984); https://doi.org/10.1117/12.947121

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