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Progress on the electro-thermo-mechanical instability and its role as seed on plasma instabilities

E Kaselouris, A Skoulakis, V Dimitriou, I Fitilis, J Chatzakis, M Bakarezos, N A Papadogiannis, M Tatarakis2022年Plasma Physics and Controlled FusionIF 2.2出版社

It was recently demonstrated that a newly explored instability, which was named electro-thermo-mechanical (ETM) instability, was developed in the solid elastic phase in the case of an electrically exploded conductor in the skin effect mode. Here, we present new advances in the exploration of the role of the ETM instability as seed of the magneto-hydro-dynamic instabilities that are later observed in the plasma phase. Our study, through analytical calculations, simulations and experiments, demonstrates the whole evolution dynamics of the instability amplitude, from the solid to the plasma phase, including the phase transitions. It is validated that the sustained axial wavelength modes in the plasma phase lie in the range of values of those of the ETM instability developed in the solid phase. The results are of significant importance for understanding the role of the ETM instability as seeding for the later observed instabilities in the plasma phase.

日本語訳

電気爆発導体の表皮効果モードにおける固体弾性相で発現する、新たに探求された電気-熱-機械的(ETM)不安定性が、最近の研究で実証された。本稿では、後にプラズマ相で観測される磁気流体力学的不安定性の種としてのETM不安定性の役割に関する探求の新たな進展を提示する。我々の研究は、解析的計算、シミュレーション、および実験を通じて、固体相からプラズマ相への遷移を含む不安定性振幅の全進化過程を実証する。プラズマ相における持続的な軸方向波長が、固体相で発現したETM不安定性の波長値の範囲内にあることが検証された。これらの結果は、後にプラズマ相で観測される不安定性の種としてのETM不安定性の役割を理解する上で極めて重要である。

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