Electron cyclotron drift instability and anomalous transport: two-fluid moment theory and modeling
Electron cyclotron drift instability and anomalous transport: two-fluid moment theory and modeling
复制标题
电子回旋漂移不稳定性和反常输运：双流体矩理论和建模
DOI：
10.1088/1361-6595/ac90e7
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发表时间：
2022
影响因子：
3.8
通讯作者：
Srinivasan, Bhuvana
中科院分区：
文献类型：
--
作者：
Wang, Liang;Hakim, Ammar;Juno, James;Srinivasan, Bhuvana
在垂直于磁场的强电场存在下，相对于未磁化离子的电子交叉场（ex - B）流动会由于离子声学模式和电子回旋谐波的共振而引起所谓的电子回旋漂移不稳定性（ECDI）。例如，这种情况发生在太空中的无碰撞激波坡道，以及像霍尔推进器这样的ex - B放电装置中。ECDI的一个突出特点是它能够以大大超过经典碰撞理论预测的速度诱导平行于背景E场的电子流。这种异常输运是重要的，因为它在空间冲击下的粒子热化中起作用，并导致等离子体流向exb器件的壁，导致不利的侵蚀和性能下降等。ECDI和异常转运的发展通常被认为需要完全动力学处理。然而，在这项工作中，我们证明了这种不稳定性的简化变体，更重要的是，相关的异常输运，可以在没有任何可调碰撞参数的无碰撞双流体框架中自洽地处理。通过平等地对待电子和离子，由于种间速度剪切的自由能允许平行于背景E场的异常电子流的增长。我们将首先提出二流体五力矩和十力矩模型中不稳定性的线性分析，并将它们与全动力学理论进行比较。在低温下，双流体模型预测的增长模式与动力学结果吻合较好。同时，通过包含更多
In the presence of a strong electric field perpendicular to the magnetic field, the electron cross-field (E× B) flow relative to the unmagnetized ions can cause the so-called electron cyclotron drift instability (ECDI) due to resonances of the ion acoustic mode and the electron cyclotron harmonics. This occurs in, for example, collisionless shock ramps in space, and in E× B discharge devices such as Hall thrusters. A prominent feature of ECDI is its capability to induce an electron flow parallel to the background E field at a speed greatly exceeding predictions by classical collision theory. Such anomalous transport is important due to its role in particle thermalization at space shocks, and in causing plasma flows towards the walls of E× B devices, leading to unfavorable erosion and performance degradation, etc. The development of ECDI and anomalous transport is often considered requiring a fully kinetic treatment. In this work, however, we demonstrate that a reduced variant of this instability, and more importantly, the associated anomalous transport, can be treated self-consistently in a collisionless two-fluid framework without any adjustable collision parameter. By treating both electron and ion species on an equal footing, the free energy due to the inter-species velocity shear allows the growth of an anomalous electron flow parallel to the background E field. We will first present linear analyses of the instability in the two-fluid five-and ten-moment models, and compare them against the fully-kinetic theory. At low temperatures, the two-fluid models predict the fastest-growing mode in good agreement with the kinetic result. Also, by including more
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