相干谐波辐射实验的测量和控制系统

Measurement and control system of coherent harmonic generation experiment

电子束和种子激光一同通过光学速调管时 ,产生相干谐波辐射 ,这是获得短波长相干光的一种很有希望的途径。为产生相干辐射 ,光学速调管波荡器磁极间隙、种子激光波长和电子能量三者必须满足共振条件 ,电子束团和种子激光脉冲在时间上必须严格同步。为使某次相干谐波辐射达到极大值 ,光学速调管色散段磁极间隙必须调节。介绍了相干谐波辐射的测量、种子激光与电子束的同步和光学速调管磁极间隙调节系统。

Electrons, passing through an optical klystron (OK) with seedlaser, emit coherent harmonic radiation. This procedure is called coherent harmonic generation. It is promising to get coherent radiation in sort wavelength range by this mothod. For a coherent harmonic generation experiment the electron energy, the OK undulator gap and the wavelength of the seed laser must meet the requirement of resonance bondition. The seedlaser must be synchronized with the electron beam. The gap of OK dispersive section must be adjusted to optimize the harmonic output. This paper describes the measurement of coherent harmonic emission, the synchronization of seed laser with electron beam, and the gap control of the optical klystron.