Effect of Transverse Radiation Defocusing in Post-Saturation Regime of High-Gain X-Ray Free-Electron Laser release_n6l77klyqffrdfohf2hq7ydxlq

by Cheng-Ying Tsai, Juhao Wu, Chuan Yang, Moohyun Yoon, Guanqun Zhou, Todd Satogata, Volker RW Schaa

Published by JACoW Publishing, Geneva, Switzerland.

2018   Volume IPAC2018, Canada

Abstract

When untapered high-gain free electron laser (FEL) reaches saturation, the exponential growth ceases and the radiation power starts to oscillate about an equilibrium. For a high-gain tapered FEL, although the power is enhanced after the first saturation, it is known that there is a so-called second saturation point where the FEL power growth stops. In addition to the sideband instability, lack of transverse radiation focusing in the post-saturation regime can be another major reason leading to occurrence of the second saturation. In this paper we study the transverse diffraction effect and its impact on tapered FEL in the post-saturation regime. The study is carried out analytically together with three-dimensional numerical simulation. The numerical parameters are taken from LCLS-like electron beam and undulator system.
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Date   2018-05-30
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