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Parametric decay instability near the upper hybrid resonance in magnetically confined fusion plasmas

机译:磁局限融合等离子体上部混合共振附近的参数衰减不稳定

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In this paper we investigate parametric decay of an electromagnetic pump wave into two electrostatic daughter waves, particularly an X-mode pump wave decaying into a warm upper hybrid wave (a limit of an electron Bernstein wave) and a warm lower hybrid wave. We describe the general theory of the above parametric decay instability (PDI), unifying earlier treatments, and show that it may occur in underdense and weakly overdense plasmas. The PDI theory is used to explain anomalous sidebands observed in collective Thomson scattering (CTS) spectra at the ASDEX Upgrade tokamak. The theory may also account for similar observations during CTS experiments in stellarators, as well as in some 1st harmonic electron cyclotron resonance and O-X-B heating experiments.
机译:在本文中,我们将电磁泵波的参数衰减调查到两个静电子波,特别是X模式泵波衰减到暖的上部混合波(电子伯恩斯坦波的极限)和暖的下杂交波。 我们描述了上述参数衰减不稳定(PDI)的一般理论,统一了早期的处理,并表明它可能发生在不发阵和弱常见的等离子体中。 PDI理论用于解释在Asdex升级托卡卡克的集体汤姆森散射(CTS)光谱中观察到的异常边带。 该理论还可能考虑在颗粒剂中CTS实验期间的类似观察结果,以及在一些第一个谐波电子回旋共振和O-X-B加热实验中。

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