脉冲功率装置汇流区由电子发射导致的电流损失机制  

Preliminary evaluation of current loss mechanism caused by electron emission at current convergence region on pulsed power facilities

作　　者：赵海龙[1,2] 董烨[3,4] 周海京[3] 邹文康[1] 王刚华[1] 王强[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900 [2]中国工程物理研究院研究生院,北京100088 [3]北京应用物理与计算数学研究所,北京100094 [4]西南交通大学物理科学与技术学院,成都610031

出　　处：《强激光与粒子束》2016年第1期78-82,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11205145;11305015;11475155)

摘　　要：面向大型脉冲功率装置聚龙一号（P T S 装置）,以电磁粒子模拟方法（PIC ） 为依托,围绕真空汇流区双层柱-孔盘旋（ DPHC ） 结构区域,研究电子发射对DPHC 结构在电流传输、汇聚过程中的影响.使用全三维大规模并行粒子模拟软件NEPTUNE3D ,简化并建立DPHC 结构的物理和几何模型,利用全电路数值模拟的方法获得PTS 装置真空轴向绝缘堆处开路和短路电压波形曲线作为输入条件,计算得到DPHC 结构中磁场强度分布.分别考虑是否存在电子发射过程,获得输出端电流损失随时间变化曲线,经过对比得到峰值时刻由阴极表面电子发射所导致的电流损失率为0 . 4 6 % -0. 4 8 % .In this paper,DPHC's function in PTS facility was preliminarily explored using NEPTUNE3 Dcode.A series of cold-chamber tests were calculated and analyzed,in which only the electron emission on cathode surface was considered without energy deposition and temperature rise.In order to calculate the acceleration,a simplified 3Dgeometry model was developed and used as an initial parameter.The full-circuit way about PTS facility was simulated in order to acquire voltage curves from vacuum insulator B under different loads,which were used as input driving signals in following PIC simulations.With the help of visualization tools,the distribution of the magnetic field and the clearer positions of magnetic nulls were both acquired and displayed in2 Dand 3Dschematics.Calculated results and data proved that DPHC behaved efficiently during current transforming and energy convergence.Preliminary research about the process of electron emission and transportation under high voltage curve were explored,and the current loss efficiencies were estimated to be around 0.46%~0.48% under different driving sources.The simulation results let us understand the DPHC functions in pulsed power systems better.

关 键 词：聚龙一号 柱-孔盘旋结构 电磁粒子模拟 磁场分布 

分 类 号：O536[理学—等离子体物理]