SASE自由电子激光起振问题及统计特性的数值模拟
Numerical stimulations of startup and statistical properties of SASE FEL
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摘要: 介绍一种自放大自发辐射自由电子激光（SASE FEL）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SASE FEL 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。Abstract: Mathematical model based on spontaneous emission and shotnoise of SASE FEL is introduced. A detailed study of startup and statistical properties of the radiation from a SASE FEL operating has been performed by means of the modified 1D timedependent FEL code. It is shown that the width of the radiation spectrum becomes at first narrow then broad. After several gain lengths the spectrum transforms into that of the high gain FEL amplifier. The statistical properties of the radiation have been proved that finitetime integrals of the instantaneous power follow a gamma distribution.
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