The electro-thermal stability of tantalum relative to aluminum and titanium in cylindrical liner ablation experiments at 550 kA
The electro-thermal stability of tantalum relative to aluminum and titanium in cylindrical liner ablation experiments at 550 kA
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DOI：
10.1063/1.5012891
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发表时间：
2018-03
影响因子：
2.2
通讯作者：
A. Steiner;P. Campbell;D. Yager-Elorriaga;K. Cochrane;T. Mattsson;N. Jordan;R. Mcbride;Y. Lau;R. Gilgenbach
中科院分区：
文献类型：
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作者：
A. Steiner;P. Campbell;D. Yager-Elorriaga;K. Cochrane;T. Mattsson;N. Jordan;R. Mcbride;Y. Lau;R. Gilgenbach
本文介绍了在密歇根加速器上进行的550 kA线性烧蚀实验的结果。进行这些实验来评估一个假设，即磁流体动力学不稳定性（ETI）是负责播种的磁流体动力学不稳定性和ETI的累积增长主要取决于材料的特定比率的临界温度熔化温度。该比率在难熔金属中较低（例如，钽）比在非难熔金属（例如，铝或钛）。本文提出的实验观察表明，等离子体真空界面是非常稳定的钽衬烧蚀。当与铝和钛实验的观察结果对比时，这种稳定性特别明显。这些结果对脉冲功率驱动等离子体物理中依赖于线性内爆稳定性的各种方案具有重要意义。例子包括磁化线性惯性聚变（MagLIF）程序。
Presented are the results from the liner ablation experiments conducted at 550 kA on the Michigan Accelerator for Inductive Z-Pinch Experiments. These experiments were performed to evaluate a hypothesis that the electrothermal instability (ETI) is responsible for the seeding of magnetohydrodynamic instabilities and that the cumulative growth of ETI is primarily dependent on the material-specific ratio of critical temperature to melting temperature. This ratio is lower in refractory metals (e.g., tantalum) than in non-refractory metals (e.g., aluminum or titanium). The experimental observations presented herein reveal that the plasma-vacuum interface is remarkably stable in tantalum liner ablations. This stability is particularly evident when contrasted with the observations from aluminum and titanium experiments. These results are important to various programs in pulsed-power-driven plasma physics that depend on liner implosion stability. Examples include the magnetized liner inertial fusion (MagLIF) prog...