The presence of instabilities in a low density, low temperature plasma expanding through an axially symmetric magnetic nozzle is investigated in the context of non-classical electron cross field transport. Electrostatic probes are used to characterize the background plasma properties and instabilities. The measurements show a primarily azimuthally propagating mode with a broad, incoherent power spectrum that appears linear at low frequencies. It is demonstrated that the observed dispersion is consistent with the lower hybrid drift instability. The energy and linear growth rate of this wave are related through quasilinear theory to an effective electron collision frequency that is shown to be dominant over classical collisions.

中文翻译：

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低温磁膨胀等离子体中的波驱动非经典电子传输

在非经典电子交叉场传输的背景下，研究了通过轴对称磁性喷嘴膨胀的低密度、低温等离子体中存在的不稳定性。静电探针用于表征背景等离子体的特性和不稳定性。测量显示主要是方位角传播模式，具有宽广的非相干功率谱，在低频下呈线性。证明观察到的分散与较低的混合漂移不稳定性一致。该波的能量和线性增长率通过拟线性理论与有效电子碰撞频率相关，该频率显示出在经典碰撞中占主导地位。