激光诱导真空电弧阴极光斑内的等离子体参数:实验和理论研究

Proceedings of 17th International Symposium on Discharges and Electrical Insulation in Vacuum Pub Date : 1996-07-21 DOI:10.1109/DEIV.1996.545978

N. Vogel, V. Skvortsov

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引用次数: 27

摘要

采用高空间分辨率(0.5 /spl mu/m)和高时间分辨率(100 ps)的激光吸收摄影技术研究了真空中激光诱导击穿阴极光斑的形成。在阴极-阳极距离为25 ~ 250 /spl mu/m的铜电极之间开始放电。放电时间750毫纳几毫秒，电流低于10 A。皮秒瞬间吸收摄影得到了阴极点点火阶段的时空密度分布。在直径小于5/spl mu/m的窄等离子体碎片中，绝对电子密度值>5/spl倍/10/sup 26/ m/sup -3/。在计算机模拟分析中获得的主要的新物理对象——“射孤子”——在膨胀的阴极光斑等离子体的移动边界上产生的非固定等离子体发射中心，对激光诱导击穿中的电流转移给出了满意的解释。

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Plasma parameters within the cathode spot of laser-induced vacuum arcs: experimental and theoretical investigations

The cathode spot formation in laser-induced breakdown in a vacuum was investigated by laser absorption photography with high spatial (0.5 /spl mu/m) and temporal (100 ps) resolution. The discharge was initiated between Cu-electrodes with cathode-anode distance of 25-250 /spl mu/m. The discharge duration was 750 ns and some milliseconds, the current below 10 A. Picosecond momentary absorption photography yielded spatial-temporal density distributions in the ignition phase of the cathode spot. An absolute electron density value >5/spl times/10/sup 26/ m/sup -3/ in narrow plasma fragments with diameter smaller than 5 /spl mu/m was estimated. Principal new physical objects-"shooting solitons"-nonstationary plasma emissive centers, generated at the moving boundary of the expanding cathode spot plasma, obtained during the analysis of computer simulations give a satisfactory explanation of the current transfer in laser-induced breakdown.

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Proceedings of 17th International Symposium on Discharges and Electrical Insulation in Vacuum

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