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Rayleigh-Taylor instabilities of a magnetically accelerated plasma

T.S Green, G.B.F. Niblett1960年被引用 37Nuclear FusionIF 3出版社

High speed photography has been used to study the compression of a deuterium plasma by an axial magnetic field generated by a wide single-turn coil. In this experiment the inductance of the coil is small compared with that of the external condenser bank so that the plasma implodes at a constant acceleration of 5 × 1012 cms/sec2. Flutes which develop on the outer surface of the plasma are interpreted as magnetohydrodynamic Rayleigh-Taylor instabilities produced by the inward acceleration of the interface separating magnetic field and plasma. The observed growth rates are in agreement with simple theory. It is shown that the ratio of the diffusivities of magnetic field and momentum determines whether the plasma resistivity or its viscosity is the dominant mechanism for damping the short wavelength instabilities. At the temperature and densities of this experiment the resistivity is primarily responsible for the damping and the wavelength of "maximum instability" calculated on this basis agrees with the observed value.

日本語訳

高速写真撮影を用いて、広幅単ターンコイルによって生成された軸方向磁場による重水素プラズマの圧縮を研究した。この実験では、コイルのインダクタンスは外部コンデンサバンクのそれに比べて小さいため、プラズマは5 × 10¹² cm/s²の一定加速度で内破する。プラズマの外表面に発生するフルート状の擾乱は、磁場とプラズマの界面が内方向に加速されることによって生じる磁気流体力学的不安定性(レイリー・テイラー不安定性)として解釈される。観測された成長率は単純な理論と一致する。磁場の拡散率と運動量の拡散率の比によって、短波長の擾乱の減衰がプラズマの抵抗率によるものか粘性によるものかが決まることが示される。この実験の温度と密度においては、抵抗率が主な減衰機構であり、この仮定に基づいて計算された「最大不安定性」の波長は観測値と一致する。

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Rayleigh-Taylor instability
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