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电子束团长度是束流诊断中的重要参数,基于相干渡越辐射(Coherent Transition Radiation,CTR)的测量方法是一种简单易行的高时间分辨率测量方法。本文调研并分析了不同电子束团长度测量方法的优缺点,选择基于CTR方法作为主要研究方向,主要针对上海深紫外自由电子激光实验装置(Shanghai Deep Ultra-Violet Free Electron Laser,SDUV-FEL)和X射线自由电子激光试验装置(Shanghai X-ray Free Electron Laser,SXFEL)进行了实验方案设计和模拟分析。结果表明,通过合理的参数选择和方案优化,用该方法可对飞秒至皮秒范围内的束团长度进行测量,时间分辨率能到达飞秒量级,满足SDUV-FEL的实验需求和SXFEL的工程需求。
E-beam length is an important parameter in beam diagnosis. Coherent Transition Radiation (CTR) -based measurement is a simple and easy method to measure time resolution. In this paper, the advantages and disadvantages of different electron bunch length measurement methods are investigated and analyzed. Based on the CTR method as the main research direction, this paper mainly focuses on Shanghai Deep Ultraviolet Free Electron Laser (SDUV-FEL) and X-ray free electron laser test device (Shanghai X-ray Free Electron Laser, SXFEL) experimental design and simulation analysis. The results show that this method can measure the length of bunch in the femtosecond to picosecond range with reasonable parameter selection and scheme optimization, and the time resolution can reach femtosecond order to meet the experimental requirements of SDUV-FEL and SXFEL Engineering needs.