束流产生的部分磁化等离子体中的三维螺旋旋转等离子体结构
Three-dimensional Helical-rotating Plasma Structures in Beam-generated Partially Magnetized Plasmas
AI总结：
本研究通过三维粒子模拟/蒙特卡罗碰撞模拟，发现束流产生的部分磁化等离子体在低压下存在两种不稳定性机制，分别形成2D螺旋臂结构和3D螺旋旋转结构，并提出了临界阈值压力与旋转频率的解析公式及实验验证。
摘要：
利用三维粒子模拟/蒙特卡罗碰撞模拟，研究了束流产生的部分磁化等离子体中出现的方位角结构。在低压下识别出两种不同的不稳定性机制。当气压足够高时，实现准中性，由于低杂不稳定性发展形成2D螺旋臂结构，导致跨场输运增强。在更低气压下，未实现准中性，由于电子二极管不稳定性发展形成3D螺旋旋转等离子体结构。提出了这些机制之间的临界阈值压力和螺旋结构旋转频率的解析公式。提供了初步实验验证。
英文摘要：
Azimuthal structures emerging in beam-generated partially magnetized plasmas are investigated using three-dimensional particle-in-cell/Monte Carlo collision simulations. Two distinct instability regimes are identified at low pressures. When the gas pressure is sufficiently high, quasi-neutrality is attained and 2D spiral-arm structures form as a result of the development of a lower-hybrid instability, resulting in enhanced cross-field transport. At lower pressures, quasi-neutrality is not achieved and a 3D helical-rotating plasma structure forms due to development of the diocotron instability. Analytical formulas are proposed for the critical threshold pressure between these regimes and for the rotation frequency of the helical structures. Preliminary experimental verification is provided.
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