螺旋磁镜中的离子声学本征模
Ion-acoustic eigenmodes in a helical magnetic mirror
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中文总结 AI 辅助
该研究针对螺旋磁镜，探讨等离子体旋转与磁场波纹耦合产生的离子声学本征模，推导其线性近似方程，指出该模可引发异常离子散射以抑制稀薄等离子体流动。
中文摘要 AI 辅助
等离子体旋转与磁场的波纹效应会导致不同方位角波数的声波耦合，在螺旋磁镜中形成具有离散频谱和零纵向群速度的本征模。这类本征模可被等离子体旋转及与捕获离子的共振相互作用激发失稳。本文推导了线性近似下描述这些波的方程，并讨论了数值求解结果，该本征模可能引发异常离子散射，而这正是有效抑制稀薄等离子体通过螺旋磁镜流动所需的机制。
英文摘要
Plasma rotation together with corrugation of magnetic field can result in coupling acoustic waves with different azimuthal wavenumbers and formation of eigenmodes with discrete frequency spectrum and zero longitudinal group velocity in a helical magnetic mirror. Such eigenmodes can be destabilized by plasma rotation as well as resonant interaction with trapped ions. Equations describing these waves in the linear approximation are derived and results of numerical solving the equations are discussed. Probably these eigenmodes may drive anomalous ions scattering which is needed for effective suppressing flow of rarefied plasma through a helical mirror.
