X箍缩背光照相  

X-ray backlighting using an X-pinch

作　　者：张然[1] 赵彤[1] 邹晓兵[1] 王新新[1] 赵勇超[1] 杜彦强[1] 王联辉[2] 

机构地区：[1]清华大学电机系,北京100084 [2]江西省人民医院,江西南昌330006

出　　处：《强激光与粒子束》2010年第4期931-935,共5页High Power Laser and Particle Beams

基　　金：全国优秀博士学位论文作者专项资金资助课题(200748);中国博士后科学基金项目(20090450355)

摘　　要：利用PPG-Ⅰ脉冲功率装置(500 kV,400 kA,100 ns)驱动X箍缩负载,得到了μm量级的亚纳秒脉冲X射线辐射点源。在阴阳极轴线和回流柱上同时安装X箍缩负载,前者可作为背光照相的X射线点源;后者可作为被拍照的目标X箍缩。获得了X箍缩发展过程不同时刻的时间序列图像,在背光照相的图像中可以清晰观察到X箍缩交叉点处等离子体的外爆、箍缩以及最终的崩溃阶段。将阴阳极轴线上的X箍缩负载用Z箍缩丝阵负载代替,实现了对丝阵负载Z箍缩放电起始阶段的X射线背光照相,观察到了最初的各单丝电爆炸、等离子体膨胀及融合过程,同时观察到了双丝Z箍缩发展过程中的等离子体不稳定性。实验结果有助于深入理解Z箍缩发展的物理过程,同时可为有效的模拟建模分析提供基本的实验数据。A pulsed power generator（PPG-Ⅰ） with a voltage of 500 kV in amplitude,a current of 400 kA in amplitude and 100 ns in pulse width was constructed.The development of X-pinches and the early stages of wire-array Z-pinches were investigated by X-ray backlighting using the X-pinch driven by PPG-Ⅰ as X-ray source.The plasma explosion and implosion near the cross point of the X-shaped wires can be clearly seen from a series of backlighting images taken at different time during X-pinch discharge.To study the early behavior of the plasma in wire-array Z-pinches,an X-pinch installed in the place of a current-return rod was used as the X-ray source to backlight a wire-array Z-pinch installed in the center between the anode and the cathode.The plasma formation,the inter-wire plasma merging,and the instabilities were also clearly observed,which can provide a better understanding of the physics of Z-pinches and the basic experimental data to validate simulation models.

关 键 词：X箍缩 X射线背光照相 丝阵Z箍缩 脉冲功率装置 

分 类 号：TL65[核科学技术—核技术及应用]