丝阵Z箍缩可见光辐射区径向变化过程
Plasma convergence studies via visible radiation diagnostic in wire-array Z-pinch implosions
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摘要: 在“强光一号”上进行的Z箍缩实验中，利用1维可见光成像系统获取了丝阵内爆可见光辐射区径向变化过程图像。采用的负载包括单层钨丝阵、单层铝丝阵，驱动电流为1.3~1.5 MA，上升时间89~140 ns。实验结果表明:丝阵内爆产生轴向先驱等离子体柱，尺寸为0.3~0.5 mm；丝阵在内爆和内爆到芯及冷却飞散阶段，外围区域始终存在较弱的可见光辐射;获得的可见光条纹像提供了丝阵等离子体内爆可见光轨迹，内爆径向压缩比为2.84～7.84，丝阵内爆速度为4.60×106～1.73×107 cm/s。Abstract: A 1-D visible radiation diagnostic system is developed to investigate plasma convergence via visible radiation with one-dimensional space and continuous time resolution in wire-array Z-pinch experiments performed on Qiangguang-I facility. The loads used in the experiments include single tungsten array and single aluminum array. During the early stages of a wire array Z-pinch implosion, low density precursor plasma is formed and streams toward the axis by the virtue of the Lorentz force. Due to trailing mass around the array plasma, some visible radiation is observed during the run-in and run-out stagnation phase. Also, the implosion tracery can be derived from visible radiation streak images. When the drive current scales from 1.0 MA to 1.5 MA, the implosion compression ratio of the wire a
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Key words:
- z-pinch /
- wire-array /
- plasma /
- visible radiation
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