Electrothermal instability mitigation by using thick dielectric coatings on magnetically imploded conductors.
Electrothermal instability mitigation by using thick dielectric coatings on magnetically imploded conductors.
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DOI：
10.1103/physrevlett.112.135002
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发表时间：
2014-04
影响因子：
8.6
通讯作者：
K. Peterson;T. Awe;E. Yu;D. Sinars;E. Field;M. Cuneo;M. Herrmann;M. Savage;D. Schroen;
中科院分区：
文献类型：
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作者：
K. Peterson;T. Awe;E. Yu;D. Sinars;E. Field;M. Cuneo;M. Herrmann;M. Savage;D. Schroen;
最近在桑迪亚的Z设施上的实验证实了模拟预测，即当厚电介质涂层用于减轻密度扰动时，固体金属棒中的不稳定性增长会大大减少。这些结果提供了进一步的证据，作为目标制造的结果的固有的表面粗糙度是不是主要的种子的磁瑞利-泰勒不稳定性的增长，在衬里仔细加工的光滑表面，而是形成早期的电流脉冲焦耳加热熔化和蒸发的衬里表面的不稳定性。这些结果表明，一个新的技术，大大减少了整体磁瑞利-泰勒不稳定性增长的磁驱动内爆，如圆柱形动态材料实验和惯性约束聚变概念。
Recent experiments on Sandia's Z facility have confirmed simulation predictions of dramatically reduced instability growth in solid metallic rods when thick dielectric coatings are used to mitigate density perturbations arising from an electrothermal instability. These results provide further evidence that the inherent surface roughness as a result of target fabrication is not the dominant seed for the growth of magneto-Rayleigh-Taylor instabilities in liners with carefully machined smooth surfaces, but rather electrothermal instabilities that form early in the electrical current pulse as Joule heating melts and vaporizes the liner surface. These results suggest a new technique for substantially reducing the integral magneto-Rayleigh-Taylor instability growth in magnetically driven implosions, such as cylindrical dynamic material experiments and inertial confinement fusion concepts.