小型X箍缩的初步实验研究

基于一台紧凑型脉冲电流发生器，对小型X箍缩进行了初步的实验研究。当改变X箍缩双细丝的直径和材料时，流过负载的总电流几乎不变，这表明双细丝阻抗远小于负载的总阻抗。使用这些细丝，X箍缩均能辐射X射线，但随着细丝质量的增大，X射线辐射时刻相对于电流起始时刻的延迟逐渐增大,X射线脉冲通常为亚纳秒脉宽的单峰或几乎重叠的双峰。对于小质量的细丝负载，若驱动电流足够大，时常观察到时间间隔较长的两个X射线脉冲，并被确认为二次箍缩所致。

Preliminary experiments on a compact X-pinch device

Based on a compact (2 m×1 m×1.5 m) pulsed current generator (~100 kA, 60 ns), a table-top X-pinch device was constructed and tested. The load current was almost unchanged for X-pinches made using different wires (5 μm, 8 μm, 10 μm and 13 μm Wu wires, 13 μm and 25 μm Mo wires), which means that the impedance of the wires is much lower than the total impedance of the load section. When the above mentioned wires were used as two-wire load, X-ray pulses from X-pinch were always observed. As the mass of the two-wire load increases, the time delay of the X-ray emission relative to the beginning of the load current increases. The X-ray pulse consists of single peak or two overlapping peaks of subnanosecond pulsewidth. Two X-ray pulses with a time interval on the order of 10 ns were often observed for a small mass load when the load current was high enough. The appearance of the second X-ray pulse is attributed to the second pinch of the plasma.