Penetration and screening of perpendicularly launched electromagnetic waves through bounded supercritical plasma confined in multicusp magnetic field
Penetration and screening of perpendicularly launched electromagnetic waves through bounded supercritical plasma confined in multicusp magnetic field
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垂直发射电磁波穿过多尖磁场约束的有界超临界等离子体的穿透和屏蔽
DOI：
10.1063/1.3551696
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发表时间：
2011
影响因子：
2.2
通讯作者：
S. Bhattacharjee
中科院分区：
文献类型：
--
作者：
I. Dey;S. Bhattacharjee
通过实验和数值模拟，研究了受约束在最小B多点场中的有界超临界(ωp>；ω，ωp和ω分别为电子等离子体和波频)等离子体对k⊥Bo模式中的波的穿透和屏蔽问题。径向等离子体的标尺长度(|Ne/(∂Ne/∂r)|)和静磁场(Bo)的不均匀性(|Bo/(∂Bo/∂r)|)远小于自由空间(λo)和导波波长(λg)。与平面波色散理论和Clemow-Mullaly-Allis(CMA)图的预测相反，对于约束等离子体，有限传播通过中心等离子体区域，其中αp2=ωp2/ω2≥1和βc2=ωCe 2/ω2⪡1(∼10−4)，其中ωCe是电子回旋频率。平面波模型所预测的波屏蔽由于来自导电边界的反射波的相位混合和叠加而不再有效，从而导致电磁驻波模式的形成。那个.。
The question of electromagnetic wave penetration and screening by a bounded supercritical (ωp>ω with ωp and ω being the electron-plasma and wave frequencies, respectively) plasma confined in a minimum B multicusp field, for waves launched in the k⊥Bo mode, is addressed through experiments and numerical simulations. The scale length of radial plasma nonuniformity (|ne/(∂ne/∂r)|) and magnetostatic field (Bo) inhomogeneity (|Bo/(∂Bo/∂r)|) are much smaller than the free space (λo) and guided wavelengths (λg). Contrary to predictions of plane wave dispersion theory and the Clemow–Mullaly–Allis (CMA) diagram, for a bounded plasma a finite propagation occurs through the central plasma regions where αp2=ωp2/ω2≥1 and βc2=ωce2/ω2⪡1(∼10−4), with ωce being the electron cyclotron frequency. Wave screening, as predicted by the plane wave model, does not remain valid due to phase mixing and superposition of reflected waves from the conducting boundary, leading to the formation of electromagnetic standing wave modes. The...