Density measurements in exploding wire-initiated plasmas using tungsten wires
Density measurements in exploding wire-initiated plasmas using tungsten wires
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DOI：
10.1063/1.873695
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发表时间：
1999-10
影响因子：
2.2
通讯作者：
S. Pikuz;T. Shelkovenko;A. R. Mingaleev;D. Hammer;H. Neves
中科院分区：
文献类型：
--
作者：
S. Pikuz;T. Shelkovenko;A. R. Mingaleev;D. Hammer;H. Neves
在30-70 ns内，对7.5-40 μm钨丝（每线电流15-120 kA）爆炸产生的日冕等离子体进行了校准密度测量。使用来自Mo线X箍缩背光灯的2.5-10 keV光子的爆炸线等离子体的X射线照片能够测量W的面密度，范围从2×1017/cm 2（相当于0.03 μm的固体密度W）到约1019/cm 2。在缓慢膨胀（<1 mm/μ s）的剩余线芯周围，快速膨胀（几mm/μ s）的日冕等离子体的面密度高达约2×1018/cm 2。用100 kA测试的单根7.5 μm导线在冠状等离子体中的初始导线材料高达90%。日冕等离子体W数密度估计高达几倍1018/cm 3，而核心W密度低至几倍1020/cm 3进行了观察。使用四（八）根7.5 μm导线的线性阵列，每根导线承载30 kA（15 kA），在电流开始后46-48 ns，高达35%（25%）的初始钨丝材料在导线周围和导线之间的等离子体中。
Calibrated density measurements have been obtained of the coronal plasmas around exploding 7.5–40 μm W wires carrying 15–120 kA per wire for 30–70 ns. X-ray radiographs of the exploding wire plasmas using 2.5–10 keV photons from a Mo wire X-pinch backlighter enabled measurements of areal densities of W ranging from 2×1017/cm2, equivalent to 0.03 μm of solid density W, to about 1019/cm2. The rapidly expanding (few mm/μs) coronal plasmas surrounding the slowly expanding (<1 mm/μs) residual wire cores have areal densities up to about 2×1018/cm2. Single 7.5 μm wires tested with 100 kA had as much as 90% of the initial wire material in the coronal plasma. Coronal plasma W number densities were estimated to be up to a few times 1018/cm3, while core W densities as low as a few times 1020/cm3 were observed. With linear arrays of four (eight) 7.5 μm wires carrying 30 kA (15 kA)/wire, up to 35% (25%) of the initial W wire material was in the plasma around and between the wires at 46–48 ns after the current started....