储存环相干谐波自由电子激光器新光学速调管工作状态分析

 合肥国家同步辐射实验室（NSRL）正在开展储存环相干谐波自由电子激光研究，为了在较高电子束能量下进行实验、且具有较高的相干辐射强度，光学速调管从原来的对称结构改造为非对称结构。分析了相干谐波实验中各参数之间的关系，及对相干谐波辐射的影响，并给出了两种工作状态下的最佳工作参数。

Working condition of reconstructed optical klystron of CHG-SRFEL

The symmetrical optical klystron (OK) of NSRL for coherent harmonic generation storage-ring free-electron laser (CHG-SRFEL) has been reconstructed to asymmetric structure in order to increase the resonant energy of electron beam and generate more powerful coherent harmonic radiation. Each period of the independently adjusted modulator has been extended from 72 mm to 92 mm, and the number of the periods has changed from 12 to 10. This paper analyzes the relations of the parameters of reconstructed optical klystron, including the resonant energy of electron beam versus the gap of modulator, special parameter of dispersive section versus the gap of dispersive section, and the gap of radiator versus the gap of modulator. It also discusses the factors that influence coherent harmonic radiation and provides the parameters of two working models in the end.