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Parametric instabilities and turbulent heating of a plasma in the field of a fast magneto-acoustic wave

A.B. Kitsenko, V.I. Panchenko, K.N. Stepanov, V.F. Tarasenko1973年被引用 28Nuclear FusionIF 3出版社

The authors consider the parametric instability of a homogeneous plasma in a magnetic field 0 and in an alternating electric field 0 perpendicular to it. The electric field frequency ω0 is of the same order as the lower hybrid frequency ωLH, while the amplitude of the relative velocity of the electrons and ions u ∼ cE0/B0 is significantly less than the thermal velocity of the electrons. The authors consider the excitation of longitudinal hydrodynamic oscillations in a cold plasma and of ion sound and electron sound in a strongly non-isothermal plasma. The characteristic values of the maximum growth rate of these oscillations is of the order of ωLH.The results are presented of experiments on turbulent plasma heating by a fast magneto-acoustic wave excited by an alternating radial electric field (f0 = ωO/2π = 150 MHz, plasma density n0 = 1012 − 1013 cm−3, B0 ≤ 5 kG). Under conditions where ω0 ∼ ωLH there is rapid heating of the electrons and ions to 200 – 400 eV. The observed heating may be attributable to the excitation of a parametric instability.

日本語訳

著者らは、磁場0およびそれに垂直な交流電場0の中での均質プラズマのパラメトリック不安定性を考察する。電場の周波数ω0は、下限混成周波数ωLHと同程度であり、電子とイオンの相対速度の振幅u ∼ cE0/B0は、電子の熱速度よりも有意に小さい。著者らは、冷たいプラズマにおける縦振動の励起と、強く非等温なプラズマにおけるイオン音波および電子音波の励起を考察する。これらの振動の最大成長率の特性値は、ωLHのオーダーである。交流径方向電場(f0 = ωO/2π = 150 MHz、プラズマ密度n0 = 10^12 − 10^13 cm^−3、B0 ≤ 5 kG)によって励起された高速磁気音波による乱流プラズマ加熱の実験結果が示されている。ω0 ∼ ωLHの条件下では、電子とイオンが200〜400 eVまで急速に加熱される。観測された加熱は、パラメトリック不安定性の励起に起因する可能性がある。

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Fusion Advanced Studies TorusParametric instabilities
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