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Saturation and cross-field coupling of beat wave driven 3-D plasma waves

G Miano, U De Angelis, R Bingham1989年Plasma Physics and Controlled FusionIF 2.2出版社

Using 3-D weakly relativistic fluid equations, the dynamics for the plasma beat wave generated by two circularly polarized electromagnetic waves with Gaussian profiles are obtained. Unlike for the linear theory the authors find that there is a strong cross-field coupling between the longitudinal and radial electric field components of the beat wave resulting in a nonlinear phase change and energy transfer between these two components. The resulting beat wave structure is controlled more by this cross-field coupling than by the other nonlinear terms such as the nonlinear coupling to the laser beams with the result that the accelerating region of the plasma beat wave is much more resistive than previously calculated.

日本語訳

3次元弱相対論的流体方程式を用いて、ガウス型プロファイルを持つ2つの円偏光電磁波によって生成されるプラズマビート波のダイナミクスを得た。線形理論とは異なり、著者らは、ビート波の縦方向電場成分と半径方向電場成分の間に強い交差場結合が存在し、その結果、これら2つの成分間で非線形位相変化とエネルギー移動が生じることを見出した。結果として得られるビート波構造は、レーザービームとの非線形結合などの他の非線形項よりも、この交差場結合によってより強く支配され、その結果、プラズマビート波の加速領域は、以前に計算されたものよりもはるかに抵抗性が高くなる。

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