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Collective scattering of electromagnetic waves in the presence of suprathermal electrons

M Lontano, U Tartari1989年Plasma Physics and Controlled FusionIF 2.2出版社

The density fluctuation spectrum, resulting from a collective (k lambda De<1) scattering process of electromagnetic waves in a plasma characterized by the presence of suprathermal electrons, has been computed in the high-frequency interval, omega approximately= omega pe, omega ce. It turns out that the amplitude of the resonant line, around the upper hybrid frequency, is amplified with respect to the thermal case, for those electrostatic oscillations propagating almost perpendicularly to the magnetic field. Moreover, the enhancement factor is given by the ratio between the average suprathermal energy and the plasma temperature, independently of the relative number of the energetic electrons. This peculiarity allows one to obtain useful information about the local spatial distribution of the energy of the suprathermal electrons and, if combined with ECE measurements, on their density distribution.

日本語訳

密度ゆらぎスペクトルは、超熱電子の存在を特徴とするプラズマ中の電磁波の集団的散乱過程(k λ_De < 1)によって計算された。高周波数領域(ω ≈ ω_pe, ω_ce)において、上部混成周波数付近の共鳴線の振幅は、熱的場合と比較して増幅されることが明らかになった。これは、磁場にほぼ垂直に伝播する静電振動について顕著である。さらに、増幅係数は、超熱電子の平均エネルギーとプラズマ温度の比によって与えられ、高エネルギー電子の相対数には依存しない。この特異性により、超熱電子のエネルギーの局所空間分布に関する有用な情報を得ることが可能となり、ECE測定と組み合わせることで、その密度分布に関する情報も得ることができる。

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