物理学报Issue(24)：245203-0-245203-7,8.DOI:10.7498/aps.64.245203
强流电子束入射角二维分布测量方法∗
A metho d of measuring the incidence angle of intense electron b eam
摘要
Abstract
In recent years, a great many of effect data obtained from the high current pulsed electron beam play an impor-tant role in the studying of X-ray thermal-mechanical effects. Energy deposition profile is the criterion to measure the equivalence of thermal-mechanical effects between high-current electron beam and X-rays. To adjust the energy deposi-tion profiles to improve the equivalence of the simulations of X-ray and thermal-mechanical effect, the intense electron beam energy deposition profile measurement should be studied. Two-dimensional distribution measurement which is an important part of the energy deposition profile is to obtain a two-dimension (r, θ) incidence angle distribution. A new method of measuring the incidence angle based on small Faraday cup array covered with aluminum films, called modified multi-layer stacking, is presented in this paper. With the help of the filtered Faraday cups, the transmission fraction of the electron beam confined at a specific position and time is stored. Two-dimension incidence angle distribution on the anode target that changes over the working time is obtained with these transmission fractions by computer calculation. The result indicates that the two-dimension incidence angle distribution has a close relationship with the pinch of the beam. The electrons tend to move vertically to the equipotential line when the diode is under Child-Langmuir flow, then they hit the target in a small angle range (<40◦). When the beam starts to pinch, as a consequence of the E × B drift, the trajectory of the electrons becomes a slanted helix with pitch changing. The incidence angle then increases to about 60◦ from small angle.关键词
强流电子束/入射角/测量方法/法拉第筒阵列Key words
intense electron beam/incidence angle/measurement method/Faraday cup array引用本文复制引用
胡杨,杨海亮,孙剑锋,孙江,张鹏飞..强流电子束入射角二维分布测量方法∗[J].物理学报,2015,(24):245203-0-245203-7,8.基金项目
国家自然科学基金(批准号:11305128,11505142)和西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室(批准号:SKLIPR1503)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant Nos.11305128,11505142) and State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi’an, China (Grant No. SKLIPR1503) （批准号:11305128,11505142）
