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介绍一种自放大自发辐射自由电子激光(SASEFEL)的自发辐射和电子束噪声的数学描述,运用修正的一维非定态程序,对SASEFEL起振问题及光场统计特性进行了数值模拟,分析了自发辐射谱的发展过程及一定频带宽度内光场随机特性的统计规律,数值模拟结果与理论结果符合较好。
A mathematical description of spontaneous emission and electron beam noise of self-amplified spontaneous emission free-electron laser (SASEFEL) is introduced. The modified one-dimensional unsteady procedure is used to simulate the onset of SASEFEL and the statistical properties of the light field. The development of spontaneous emission spectra and the statistical laws of the random characteristics of the light field in a certain bandwidth are consistent with each other. The numerical simulation results are in good agreement with the theoretical results.