基于磁场测量的激光尾场电子束加速过程及其脉宽的诊断方案研究

项目名称： 基于磁场测量的激光尾场电子束加速过程及其脉宽的诊断方案研究

项目编号： No.11505263

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 李文涛

作者单位： 中国科学院上海光学精密机械研究所

项目金额： 23万元

中文摘要： 尽管目前激光尾场电子加速器的研发和应用都取得了很大的进展，但是人们对其电子束的具体加速过程和电子束脉宽仍然缺乏直观的探测手段，往往只能通过数值模拟软件来进行分析推测。基于法拉第旋光效应的电子束磁场测量有望同时解决电子束加速过程探测和电子束脉宽诊断这两个问题，从而加深人们对激光尾场电子加速器的研究深度。申请人在研究生和工作期间一直从事激光尾场电子加速器的研究工作，并长期负责相关的诊断单元。以第一作者的身份在Applied Physics Letters和Physics of Plasmas等国际专业期刊上发表相关论文4篇，并获得了两项与电子束诊断相关的发明专利。申请人在国际上首次实现了单发双点的电子束磁场测量，在此基础上，申请人计划从提高信噪比、增加单次测量点、探测电子束的传播过程和测量飞秒电子束脉宽这四个方面着手，完善电子束磁场诊断方案，实现对电子束加速及传播过程和电子束脉宽的高效测量。

中文关键词： 激光尾场加速器；磁场测量；飞秒电子束脉宽测量

英文摘要： Great improvements have been achieved in the field of Laser Wakefield Electron Acceleration (LWFA). In this progress, the LWFA research is greatly relied on the simulation software due to the lack of the diagnosis of the acceleration process and beam duration. The Faraday-rotation measurement of magnetic field is expected to solve these two problems, which may provide great assistance in the LWFA research. The applicant has been engaged in the LWFA research during the graduate and work, and has been in charge of the diagnosis unit for more than two years. As the first author, the applicant has published four articles in the international journals such as Applied Physics Letters and Physics of Plasmas, and has two authorized patents of the electron beam diagnosis. The applicant has measured the magnetic fields of two points in single shoot for the first time. Based on this study, the applicant is planning to improve the Faraday-rotation measurement in aspects of improving the single to noise ratio, increasing the detecting points, measuring the beam propagation and the beam duration.

英文关键词： laser wakefield electron acceleration;measurement of magnetic field;the diagnosis of the beam duration