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Impact of trapped waves radiation losses on the saturation of low threshold two-UH-plasmon parametric decay instability

A Y Popov, A A Nagovitsin, E Z Gusakov2022年Plasma Physics and Controlled FusionIF 2.2出版社

The dispersion equation for metastable states in a finite tower of eigenmodes of trapped upper hybrid (UH) waves arising from a non-monotonic density profile is derived and then solved both analytically and numerically. The influence of the UH eigenmode damping due to the radiation losses on the saturation level of the two-UH-plasmon low-threshold parametric decay instability is analyzed. Transitions from the odd-step number secondary decay saturation cascade to the even one and vice versa at the radiation loss variation are investigated and shown to initiate a substantial change of the anomalous absorption.

日本語訳

非単調な密度プロファイルから生じる捕捉された上部ハイブリッド(UH)波の固有モードの有限な塔におけるメタ安定状態のための分散方程式を導出し、その後、解析的および数値的に解く。放射損失によるUH固有モードの減衰が、2つのUHプラズモン低閾値パラメトリック崩壊不安定性の飽和レベルに及ぼす影響を解析する。放射損失の変動における奇数ステップ数の二次崩壊飽和カスケードから偶数ステップ数への遷移、およびその逆の遷移を調査し、異常吸収の実質的な変化を引き起こすことを示す。

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Ion lossParametric decayDecay instability
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