箍缩背光照相

 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。

X-ray backlighting using an X-pinch

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.