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电子束团纵向长度是束流诊断中的重要参数,电光频谱解码法(Electro-Optical Spectral Decoding,EOSD)是为数不多的可进行单发测量的高时间分辨率测量方法。本文基于上海深紫外自由电子激光装置(Shanghai Deep Ultraviolet Free Electron Laser,SDUV-FEL)设计了一套电光频谱解码法测量束团长度实验方案。通过采用针尖粗同步和可调的光栅展宽器可实现长度在1-10 ps内变化的束团无损测量。通过对电光调制过程及其后探测的仿真研究表明,选用0.5 mm厚的Zn Te晶体在距离束流中心3-5 mm处测量时,时间分辨率最高可达180 fs(Root Mean Square,RMS),信号展宽在3%以内,测量的电场形状无可观测畸变,满足SDUV-FEL的实验需求。
The longitudinal length of the electron bunch is an important parameter in beam diagnosis. Electro-Optical Spectral Decoding (EOSD) is one of the few high-resolution time-resolution measurement methods that can perform single-shot measurement. Based on Shanghai Deep Ultraviolet Free Electron Laser (SDUV-FEL), a set of experimental scheme for measuring bunching length by electro-optic spectrum decoding is designed. The non-destructive measurement of bunches varying in length from 1 to 10 ps can be achieved with coarse and adjustable tip stretcher. The simulation of electro-optic modulation process and subsequent detection shows that the time resolution of up to 180 fs (Root Mean Square, RMS) can be obtained when 0.5 mm thick ZnTe crystal is measured at a distance of 3-5 mm from the beam center. , The signal spread is within 3%, and the measured shape of the electric field has no observable distortion, meeting the experimental requirements of SDUV-FEL.