一维时空分辨诊断技术在Z-pinch实验中的应用

The Application of 1-D X-ray Imaging System in Wire-Array Z-pinch Implosions

在Angara-5-1装置上进行的丝阵Z-pinch实验中,红光塑料闪烁体薄膜将X光转换为可见光,通过光纤阵列、光纤传像束传输至可见光条纹像机(OSC),紧贴于像机屏幕的光纤锥将信号耦合至CCD进行记录,提供丝阵一维条纹像,观察丝阵负载Pinch区X射线辐射空间分布信息随时间的演化过程。实验中系统时间分辨4.3ns,空间分辨0.3mm。负载采用单层丝阵与双层丝阵。研究结果表明,X光辐射波形前沿上升时间越快,功率峰值越高;双层丝阵构形改善了内爆同步性;等离子体的内爆动能与电流成正比,电流愈大,等离子体的动能也愈大,X光辐射能量与电流成正比。

A time-resolved 1-D x-ray imaging system is developed to investigate the x-ray power distribu- tion with one-dimensional space and continuous time re.solution in wire-array Z-pinch experiments performed on Angara-5-1 facility. In these experiments various loads were used including nested-wire array and single array. The double-array implosion had a better axial implosion uniformity and synchronization than the single-array implosion, as well as the higher peak radiated x-ray power. It is shown that better synchronization and faster rise-time corresponds to higher x-ray radiation power, while better axial synchronization corresponds to faster rise-time. Furthermore, analysis indicates some relationship between a better implosion synchronization and a higher x-ray power. Higher x-ray radiation power and imploding kinetic energy obviously have something to do with higher load current.