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Adiabatic evolution of phase space electron–hole in plasmas with super-thermal electrons

H Abbasi, H Hakimi Pajouh2008年Plasma Physics and Controlled FusionIF 2.2出版社

The possibility of the nonlinear decay of a localized perturbation into the ion-acoustic solitons is studied. This corresponds to the formation of several electrons–holes in the phase space. The plasma is assumed to contain a population of super-thermal electrons and therefore the κ distribution is used to model the high energy tail in the electron distribution function. The formalism is derived near the ion plasma frequency. In this range of frequency, the ion dynamics is considerable and the ion-acoustic solitons are the stationary solutions of the governing equations. It is shown that a slowly varying dynamics of the order of ion motions causes an initial Gaussian hole to be disintegrated into a number of electron–holes. The non-stationary process of the hole formation is adiabatic. The hole velocities, which are of the order of the ion-acoustic velocity, are slightly different. The set of ion-acoustic solitons forms neighboring (neighboring in phase space) holes. The influence of both trapped and super-thermal electrons on this process is studied.

日本語訳

局所的な摂動がイオン音響ソリトンへ非線形崩壊する可能性が研究される。これは位相空間における複数の電子ホールの形成に対応する。プラズマは超熱電子の集団を含むと仮定され、したがってκ分布が電子分布関数の高エネルギー尾部をモデル化するために用いられる。定式化はイオンプラズマ周波数の近傍で導出される。この周波数範囲では、イオンの動力学は重要であり、イオン音響ソリトンは支配方程式の定常解である。イオン運動のオーダーのゆっくり変化する動力学が、初期のガウス型ホールを複数の電子ホールに崩壊させることが示される。ホール形成の非定常過程は断熱的である。イオン音速のオーダーであるホール速度は、わずかに異なる。イオン音響ソリトンの集合は、隣接する(位相空間で隣接する)ホールを形成する。この過程に対する捕捉電子と超熱電子の両方の影響が研究される。

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