ECR等离子体微波耦合的简化模型

M. Cavenago
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引用次数: 1

摘要

磁化等离子体与微波的强烈相互作用,当它们的角频率$\omega$在电子回旋共振(ECR)附近,即$\Omega=e\vert \mathrm{B}^{s}\vert /m_{e}$,与$\mathrm{B}^{s}$的静态磁通密度。在假设碰撞率$v$和等离子体密度为给定的情况下,用完整的波动方程研究了波长和等离子体室半径相当的$\mathrm{B}^{s}\cong 0.5$至1t小离子源的情况。波最初以TE模式从波导(TE11为圆波导)发射,与圆柱形等离子体室的轴$z$和$\mathrm{B}^{s}$对齐,部分转换为$E_{z}$波;讨论了使用方位角对称只考虑$m=1$分量。有时观察到大反射是等离子体角频率$\omega_{p}(z)$和$\omega$之比的函数,可能是由于模型简化($x$和$y$中的密度常数)。扩展到离轴波导(可能是矩形或同轴)被提到。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Simplified Model of Microwave Coupling in ECR Plasmas
A magnetized plasma strongly interacts with microwaves, when their angular frequency $\omega$ is around the electron cyclotron resonance (ECR) one, that is $\Omega=e\vert \mathrm{B}^{s}\vert /m_{e}$, with $\mathrm{B}^{s}$ the static flux density. The case of small ion sources with $\mathrm{B}^{s}\cong 0.5$ to 1 T, where wavelength and plasma chamber radius are comparable, is studied with full wave equations, assuming a collision rate $v$ and a plasma of given density. Wave initially launched in the TE mode from a waveguide (TE11 for a circular waveguide), aligned with the axis $z$ of a cylindrical plasma chamber and of $\mathrm{B}^{s}$, are partially converted to $E_{z}$ waves; use of azimuthal symmetry to consider only the $m=1$ component is discussed. Large reflections are sometimes observed as a function of ratio of plasma angular frequency $\omega_{p}(z)$ and $\omega$, possibly due to model simplification (density constant in $x$ and $y$). Extension to off-axis waveguides (perhaps rectangular or coaxial) is mentioned.
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