超高速碰撞LY12铝靶产生膨胀等离子体云的电导率测量  

Conductivity measurement of an expanding plasma cloud generated by hypervelocity impact LY12 aluminum target

作　　者：唐恩凌[1,2] 张庆明[2] 张健[1] 

机构地区：[1]沈阳理工大学装备工程学院,沈阳110168 [2]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《强激光与粒子束》2009年第2期297-300,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10772028);沈阳市人才资源开发专项基金项目(20081400103009)

摘　　要：为了研究超高速碰撞过程中产生的膨胀等离子体云的电导率,设计了适用于瞬态等离子体电导率测量的扫描电探针系统。通过二级轻气炮加载LY12球形铝弹丸,运用设计的扫描电探针系统分别进行了相同入射角度和不同碰撞速度条件下超高速碰撞产生等离子体电导率的实验测量。通过对探针等效电路的分析,获得了在整个物理过程中给定探针位置处产生膨胀等离子体云的电导率随时间的变化关系。实验结果表明:在碰撞角度(与靶板平面的夹角)相同、传感器布局相同的条件下,碰撞速度越大,产生膨胀等离子体云的电导率相对越大。To study conductivity of an expanding plasma cloud generated during hypervelocity impact, a scanning electrical probe diagnostic system suitable for transient plasma conductivity measurement is designed. Spherical projectile of LY12 aluminum is loaded by two-stage light-gas gun, the scanning electrical probe diagnostic system was used to measure plasma conductivity, which was generated by hypervelocity impact at different impact velocities or the same angles. The relationship between the plasma conductivity generated during the whole physical process at the positions of probes and the time was obtained by analyzing the equivalent circuit. Experimental results show that the conductivity depends on impact velocity and at the same impact angle and the sensor layout, the expanding plasma cloud conductivity increases with the impact velocity increasing.

关 键 词：等离子体 超高速碰撞 LY12铝 电导率 

分 类 号：O531[理学—等离子体物理]