100MeV电子直线加速器的物理设计

Physical design of 100 MeV electron linac

能量为100 MeV左右的高性能电子直线加速器是第三代同步辐射光源注入器和自由电子激光注入器的重要组成部分,采用热阴极栅控电子枪、聚束系统和4根SLAC型加速管作为加速器主体结构,一套45 MW的速调管调制器系统和波导系统作为微波功率源系统。设计中,使用了国际通用的模拟软件对加速器的动力学特性进行了数值模拟和参数优化,电子束能量达到100 MeV以上,能散小于1%,归一化发射度小于30 mm.mrad。

The main part of the 100 MeV electron linac consists of a thermionic electron gun, a bunching system and 4 SLAG type accelerating tubes. The bunching system and the accelerating tubes are fed by a 45 MW S-band microwave power source. The beam dynamics of the linac is studied and optimized using several beam dynamics simulation programs. After optimization, the beam energy, energy spread and the normalized emittance is designed to be greater than 100 MeV, less than 1 % and 30 mm. mrad, respectively.