Preliminary experiments on a compact X-pinch device
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摘要: 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。Abstract: Based on a compact (2 m1 m1.5 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 m, 8 m, 10 m and 13 m Wu wires, 13 m and 25 m 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.
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Key words:
- x-pinch /
- z-pinch /
- pulsed x-ray source /
- x-ray backlighting /
- phase-contrast imaging
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