强激光与粒子束2011，Vol.23Issue(11)：2974-2978,5.DOI:10.3788/HPLPB20112311.2974
强流电子束源阴极等离子体的粒子模拟
Particle-in-cell simulation on plasma near the cathode of high current electron beam source
摘要
Abstract
This paper presented the particle-in-cell simulations on the expansion process of the plasma with a density about 1014 cm-3 near the cathode surface. The plasma expanding with velocity about 1 cm/μs was observed. The expansion process was analyzed based on the observations of the particle distributions, the particle velocity and the axial electric field at different time. The influences of the plasma temperature and plasma formation rate on the plasma expansion process were discussed. It is shown that the appearance of ions strengthens the electric field on the cathode surface, leading to the increase of electron beam density. The electron field at the plasma front decreases with the increase of beam density, thus the movement of ions towards anode can be realized. The plasma expansion velocity increases while the plasma temperature grows up. However, the relationship of thermal velocity can not apply. Smaller plasma formation rate leads to lower plasma expansion.关键词
强流电子束二极管/爆炸电子发射/阴极等离子体/等离子体膨胀速度/粒子模拟Key words
electron beam diode/ explosion electron emission/ cathode plasma/ plasma expansion velocity/ particle-in-cell simulation分类
数理科学引用本文复制引用
徐启福,刘列..强流电子束源阴极等离子体的粒子模拟[J].强激光与粒子束,2011,23(11):2974-2978,5.基金项目
国家自然科学基金项目(10975186) （10975186）
