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首页> 外文会议>International symposium on System synthesis >Plasma formation and seeding of Rayleigh-Taylor instabilities inwire array z-pinches
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Plasma formation and seeding of Rayleigh-Taylor instabilities inwire array z-pinches

机译：等离子体中瑞利-泰勒不稳定性的等离子体形成和接种线阵列Z形夹

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Summary form only given, as follows. X-ray radiography with hightemporal (~1 ns) and spatial (~20 μm) resolution was used to studyimplosion dynamics of while array Z-pinch in experiments on the 1.4 MA,240 ns MAGPIE facility. Comparison of laser probing and X-rayradiography data shows that the plasma formed from the wires has aheterogeneous structure, with a low density corona surrounding the densewire cores. Non-uniform sweeping of the coronal plasma by the globalJ×B force from the wires towards the array axis produces both massperturbations in the wire cores and a precursor column on the axis. Thespatial scale of these perturbations, which act as seeding for theglobal m=0 mode of the Rayleigh-Taylor instability, is determined by thesize of wire cores (0.25 mm for Al and 0.1 mm for W). A qualitativechange in the implosion dynamics (transition to D-like implosiontrajectory) was observed in Al arrays when the ratio of inter-wire gapto the wire core size decreased to ~3. This probably explains theexistence of “critical” inter-wire gap, below which asignificant rise in X-ray power was observed in experiments at SandiaNational Lab. Experimental data on “nested” wire arrayimplosions will be presented, which show significant sharpening of theX-ray pulse in different dynamic modes of the interaction between thetwo arrays
机译：仅给出摘要表格，如下。 X射线照相高 使用时间（〜1 ns）和空间（〜20μm）分辨率进行研究 在1.4 MA上进行的实验中，虽然同时进行阵列Z捏的内爆动力学， 240 ns MAGPIE设施。激光探测与X射线的比较 射线照相数据显示，由导线形成的等离子体具有 异质结构，致密物周围有低密度电晕 线芯。全球对冠状血浆的不均匀扫描 来自导线的J×B力朝向阵列轴会产生两个质量 线芯和轴上的前驱体柱中的微扰。这 这些扰动的空间尺度，为 瑞利-泰勒不稳定性的整体m = 0模由 线芯的尺寸（铝为0.25毫米，钨为0.1毫米）。定性的 内爆动力学的变化（转变为D型内爆） 线间间隙的比率在铝阵列中观察到） 线芯尺寸减小到〜3。这可能解释了 存在“关键”线间间隙，低于该间隙 在桑迪亚的实验中观察到X射线功率显着上升 国家实验室“嵌套”线阵列的实验数据 将显示内爆，这表明 X射线脉冲在不同动态模式之间的相互作用 两个数组

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