通过数值模拟, 结合解析计算分析, 研究了Echo-enabled谐波放大自由电子激光对装置参数和主要束流参数变化的独立敏感性, 给出了谐波聚束因子和饱和功率随参数变化的数值模拟结果; 对色散段由相干同步辐射效应引起的能散和发射度增长进行了估算和数值模拟。结果表明: 相干同步辐射效应引起的切片能散和切片发射度增长在5%以内, 对最后辐射影响不大。

The echo-enabled harmonic generation free electron laser(EEHG FEL) was proposed for producing short wavelength FEL radiation recently. The parameter sensitivity of EEHG FEL is studied through numerical simulation as the main method and analytical calculation. The simulation results are in excellent agreement with the analytical caculation results. The energy spread growth and emittance growth due to the coherent synchrotron radiation(CSR) in dispersing section are estimated and simulation is also done. The results show that the energy spread growth and emittance growth are small and can be ignored.