同轴电极结构下真空放电等离子体生成及传播特性(英文)  

Generation and propagation characteristics of vacuum discharge plasma with co-axial electrodes

作　　者：刘文正[1] 王浩[1] 

机构地区：[1]北京交通大学电气工程学院,北京100044

出　　处：《强激光与粒子束》2013年第8期2111-2116,共6页High Power Laser and Particle Beams

基　　金：Ministry of Education Returned Overseas Stuff to Start Research and Fund Projects(E07C30010);High Energy,High Density,High Valence Vacuum Discharge Plasma Research Projects(EJ06014)

摘　　要：采用放电电流为100～300 A、持续时间为13μs的单脉冲电源,设计了两种同轴电极结构作为放电阳极,分别为筒状电极、喷嘴状电极。利用MAXWELL 3D电场仿真软件对两种电极结构下的电场分布进行了仿真分析,并采用探针法对放电生成的等离子体的参数进行了测量,分析讨论了同轴电极结构对真空放电等离子体生成特性的影响。选取喷嘴状电极结构作为阳极,分别测量了采用铅、铝、铜三种材质的阴极时生成的等离子体的扩散速度及能量。实验与仿真结果表明:当阳极为喷嘴状电极时阴极尖端的电场强度较大,测得放电电流较大,击穿电压较低,等离子体密度也较大;采用铝材质阴极时生成的等离子体扩散速度最快,采用铅材质阴极时生成的等离子体的离子动能最大。Vacuum discharge plasma is generated using a single-pulse power supply with 13 us pulse width and 100～300 A discharging current. Two types of co-axial electrodes, namely the tubular electrode and the trumpet electrode, are employed as anodes. The electric field distribution with two electrodes is simulated by MAXWELL 3D simulation software. The parameters of vacuum discharge plasmas, such as electron density, e lectron temperature, space potential and ion kinetic energy, are measured by the Langmuir probe method to in vestigate the impact of co-axial electrode configurations on the plasma generation characteristics. Moreover, the effects of cathode materials on the ion velocity and kinetic energy are discussed, as lead, aluminum, and copper are used as the cathode material, respectively, with the trumpet electrode configuration. Experimental and sim ulation results show that the plasma generated with the trumpet electrode exhibits higher discharge current, greater plasma density, and lower breakdown voltage compared to the tubular one. The aluminum cathode can generate plasma with the highest diffusion velocity, while the lead cathode yields the maximum ion kinetic ener gy of plasma.

关 键 词：电极结构 真空放电 朗缪尔探针法 等离子体密度 离子动能 

分 类 号：TB8[一般工业技术—摄影技术] TB7