Compressional Alfven eigenmodes (CAE) driven by energetic ions have been observed in magnetic fusion experiments. In this paper, we show that the modes can also be driven by runaway electrons formed in post-disruption plasma, which may explain kinetic instabilities observed in DIII-D disruption experiments with massive gas injection. The mode-structure is calculated, as are the frequencies which are in agreement with experimental observations. Using a runaway electron distribution function obtained from a kinetic simulation, the mode growth rates are calculated and found to exceed the collisional damping rate when the runaway electron density exceeds a threshold value. The excitation of CAE poses a new possible approach to mitigate seed runaway electrons during the current quench and surpassing the avalanche.

中文翻译：

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由失控电子激发的压缩阿尔芬本征模式

在磁聚变实验中已经观察到由高能离子驱动的压缩阿尔芬本征模式 (CAE)。在本文中，我们表明这些模式也可以由在破裂后等离子体中形成的失控电子驱动，这可以解释在大量气体注入的 DIII-D 破裂实验中观察到的动力学不稳定性。计算模式结构，以及与实验观察一致的频率。使用从动力学模拟中获得的失控电子分布函数，计算模式增长率并发现当失控电子密度超过阈值时超过碰撞阻尼率。CAE 的激发提出了一种新的可能方法来减轻电流猝灭和超过雪崩期间的种子失控电子。