曙光一号自由电子激光器边带不稳定性研究

STUDIES ON SIDEBAND INSTABILITIES IN SHUGUANG-1 FEL

结合曙光一号自由电子激光器的实际条件,在WAGF EL程序的基础上考虑了光脉冲和电子脉冲因速度不同而引起的滑移,使处在有质动力势阱中的电子因同步振荡位相的不同而发生耦合,使激光强度的调制出现边带不稳定增长而导致光束质量变坏。程序的考察通过利弗莫尔实验室 GINGER程序的结果进行,以确保计算结果的可靠。在此基础上对曙光一号自由电子激光器的边带进行了计算。

According to the real conditions for SG-1 FEL, sideband instabilities are numerically simulated. Using WAGFEL code, the slippage due to different velocities between optical pluse and electron pulse is considered, which makes electrons trapped in ponderomotive well couple with each other at changeable phases in sychrotron oscillation, hence leading to the growing of sideband instabilities from intensity modulation of laser. This code is checked by comparison with the results of GINGER code of LLNL.