用于测量光发射电子束横向动量和发射度的紧凑装置的系统分析。
Systematic analysis of a compact setup to measure the photoemitted electron beam transverse momentum and emittance.
作者信息
Yu Lei, Wan Weishi, Tang Wen-Xin, Feng Jun
机构信息
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaShanghaiTech University, Shanghai 201210, ChinaInstitute for Quantum Science and Engineering, South University of Science and Technology, Shenzhen 518055, Guangdong, ChinaDepartment of Materials Science and Engineering, South University of Science and Technology, Shenzhen 518055, Guangdong, China.
ShanghaiTech University, Shanghai 201210, China.
出版信息
Rev Sci Instrum. 2021 Jan 1;92(1):013302. doi: 10.1063/5.0013122.
A compact setup with a planar-cathode and grid-anode plus free field drift distance configuration (momentatron) has provided a new way to measure the transverse momentum and, hence, the emittance of the electron beam from a photocathode. This method has been used for analysis of the transverse momentum and emittance of the photoemitted electron beam from the photocathode in a stepwise manner during the fabrication process. The errors caused by the lensing effect from opening holes of the grid anode and misalignments caused by tilting and curving have been systematically analyzed. An analytical method has been developed, and a full three-dimensional electrostatic field particle tracing simulation has been performed to validate this measurement technique. The results show that a momentatron can provide an accurate measurement of transverse momentum and emittance of the photoemitted electrons. The reasonable experimental errors that may be encountered will only have a modest (few %) effect on the emittance measurement.
一种采用平面阴极、栅极阳极以及自由场漂移距离配置（矩聚焦管）的紧凑装置，为测量横向动量以及由此测量光阴极电子束的发射度提供了一种新方法。该方法已被用于在制造过程中逐步分析来自光阴极的光发射电子束的横向动量和发射度。系统地分析了由栅极阳极开孔的透镜效应以及倾斜和弯曲导致的未对准所引起的误差。已开发出一种解析方法，并进行了完整的三维静电场粒子追踪模拟，以验证这种测量技术。结果表明，矩聚焦管能够准确测量光发射电子的横向动量和发射度。可能遇到的合理实验误差对发射度测量的影响仅为适度的（几个百分点）。
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