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arXiv 2106.03293physics.plasm-ph
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磁场中热传导抑制对烧蚀瑞利-泰勒不稳定性增长的增强

Enhancement of ablative Rayleigh-Taylor instability growth by thermal conduction suppression in a magnetic field

Kazuki Matsuo, Takayoshi Sano, Hideo Nagatomo, Toshihiro Somekawa, King Fai Farley Law, Hiroki Morita, Yasunobu Arikawa, Shinsuke Fujioka

摘要:

研究了在磁场中烧蚀瑞利-泰勒不稳定性增长的基本物理机制。实验发现,在外加磁场中,不稳定的调制增长更快。这一结果是由磁流体动力学模拟的基础上的电子热输运的Braginskii模型。外部磁场减少了电子热传导通过磁场线,因为在现场的热电子的拉莫尔半径是远远短于温度标度长度。热传导抑制导致空间不均匀的压力和减少的热烧蚀稳定性,这反过来又增加了烧蚀瑞利-泰勒不稳定性的增长。

英文摘要:

Ablative Rayleigh-Taylor instability growth was investigated to elucidate the fundamental physics of thermal conduction suppression in a magnetic field. Experiments found that unstable modulation growth is faster in an external magnetic field. This result was reproduced by a magnetohydrodynamic simulation based on a Braginskii model of electron thermal transport. An external magnetic field reduces the electron thermal conduction across the magnetic field lines because the Larmor radius of the thermal electrons in the field is much shorter than the temperature scale length. Thermal conduction suppression leads to spatially nonuniform pressure and reduced thermal ablative stabilization, which in turn increases the growth of ablative Rayleigh-Taylor instability.

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