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Self-consistent propagation of an electromagnetic wave and power absorption at the electron gyroresonance in a plasma immersed in a non-uniform magnetic field

M. Brambilla1969年被引用 7Nuclear FusionIF 3出版社

The self-consistent equation for the propagation of a right-hand polarized electromagnetic wave in a cold plasma immersed in a non-uniform magnetic field is solved exactly under the assumption that the parallel electron velocity v|| is constant. This equation , which properly takes into account the dissipative component of the induced current, leads to expressions for the reflection, transmission and absorption coefficients which reduce to those obtained by Stix and Budden in the limit v|| = 0. The reflection coefficient is found to vanish identically, while the absorption is almost complete if the density is sufficiently high.An approximate solution is then obtained for the case where the non-linear effects in the resonance zone (axial acceleration, relativistic change of mass) cannot be neglected. It is found that these effects can give rise to substantial wave reflection. Thus at high h.f. power the electromagnetic energy is effectively coupled to the plasma only if the density is high enough to reduce the intensity of the electric field in the resonance region to a level such that the linear theory applies.

日本語訳

非一様磁場中に浸された冷たいプラズマ中の右回り偏波電磁波の伝播に対する自己無撞着方程式は、平行電子速度 v|| が一定であるという仮定の下で厳密に解かれる。誘起電流の散逸成分を適切に考慮したこの方程式は、反射係数、透過係数、吸収係数に対する式を与え、それらは v|| = 0 の極限で Stix と Budden によって得られた式に帰着する。反射係数は恒等的に消えることがわかる一方、密度が十分に高い場合には吸収はほぼ完全である。次に、共鳴領域における非線形効果(軸方向加速、相対論的質量変化)を無視できない場合に対する近似解が得られる。これらの効果はかなりの反射を引き起こし得ることがわかる。したがって、高周波大電力時には、電磁エネルギーがプラズマに効果的に結合されるのは、密度が十分に高く、共鳴領域の電場強度を線形理論が適用できるレベルまで低下させる場合に限られる。

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