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Scaling law for interchange transport in magnetically confined electron-positron plasmas with ion impurity 含离子杂质的磁约束电子-正电子等离子体中交换输运的标度律
Fundamental Plasma Physics
Pub Date : 2022-06-01 DOI: 10.1016/j.fpp.2022.09.001
M. Kühbauch, A. Kendl

Interchange instabilities are a critical issue for confinement and transport in (otherwise exceptionally stable) planned magnetically confined quasi-neutral electron-positron plasma experiments. An additional ion impurity concentration can signifcantly affect the instability. The dispersion relation for interchange modes in perturbed inhomogeneously magnetized electron-positron plasmas in the presence of impurity ions is derived from full-f isothermal gyrofluid equations. The model includes arbitrary ion concentration and Debye screening effects. The resulting interchange growth rate of localized density perturbations is related to the cross-field propagation velocity and associated transport, which is reduced by an additional ion concentration compared to pure electron-positron plasmas. A simplified scaling relation is obtained from the exact analysis and compared with previous pure electron-positron plasma limits and empirical scalings based on simulation data.

交换不稳定性是计划磁约束准中性电子-正电子等离子体实验中约束和输运(否则异常稳定)的关键问题。额外的离子杂质浓度会显著影响不稳定性。利用全等温陀螺流体方程，导出了杂质离子存在下扰动非均匀磁化电子-正电子等离子体中交换模的色散关系。该模型包括任意离子浓度和德拜筛选效应。局域密度扰动产生的交换增长率与跨场传播速度和相关输运有关，与纯电子-正电子等离子体相比，额外的离子浓度降低了交换增长率。通过精确分析得到了简化的标度关系，并与以往纯电子-正电子等离子体极限和基于模拟数据的经验标度进行了比较。
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引用次数: 0
Magnetic properties of twisted plasmons 扭曲等离子体的磁性
Fundamental Plasma Physics
Pub Date : 2022-05-01 DOI: 10.1016/j.fpp.2022.07.001
J.T. Mendonça

We consider the linear and nonlinear properties of twisted plasmons propagating in a magnetized plasma. Twisted plasmons are electron plasma waves with a finite amount of angular momentum. In contrast with plane plasma waves, which propagate along the static magnetic field direction with the same dispersion as in isotropic plasmas, the properties of twisted waves depend on the value of their angular momentum. A new dispersion relation is derived, using the fluid approximation. We also study nonlinear effects associated with twisted plasmons, and show that they introduce electromagnetic corrections. Of particular relevance is the excitation of a quasi-static magnetic field, which is associated with finite amplitude plasmon solutions.

研究了磁化等离子体中扭曲等离子体的线性和非线性特性。扭曲等离子体是具有有限角动量的电子等离子体波。与平面等离子体波不同，平面等离子体波沿静态磁场方向传播，色散与各向同性等离子体相同，扭曲波的性质取决于其角动量的值。利用流体近似导出了一种新的色散关系。我们还研究了与扭曲等离子体相关的非线性效应，并表明它们引入了电磁修正。特别相关的是准静态磁场的激发，它与有限振幅等离子体解有关。
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引用次数: 0
25th International Winter Meeting on Fundamental Physics 第25届国际基础物理冬季会议
Fundamental Plasma Physics
Pub Date : 1998-04-03 DOI: 10.1142/9789814528214
M. Aguilar-Benitez, Á. Morales, E. Fernández, F. Ynduráin
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引用次数: 0
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