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Asymmetric electron cyclotron emission from non-thermal plasmas subject to a generalized Kirchhoff's law

M Bornatici, U Ruffina1996年Plasma Physics and Controlled FusionIF 2.2出版社

The electron cyclotron emission (ECE) spectra characteristic of a non-thermal plasma comprising a current-carrying superthermal electron tail, for which a generalized Kirchhoff's law holds true, are evaluated for both the extraordinary (X) and ordinary (O) mode, for perpendicular as well as oblique propagation on the outboard side of the plasma; both higher order finite-Larmor-radius effects and harmonic overlap are accounted for. Besides a spectrally narrow non-thermal feature occurring at frequencies downshifted to both first (in X and O-modes) and second (X-mode only) harmonic cyclotron frequencies outside the plasma, the non-thermal ECE contributes a spectrally broad enhancement to the thermal emission, a salient characteristic of the non-thermal ECE being the asymmetry with espect to the parallel refractive index. The relevance of the upshifted second harmonic ECE of the X-mode is discussed along with the concomitant downshifted third harmonic emission for both optically thick and optically thin plasmas.

日本語訳

非熱的プラズマに特徴的な電子サイクロトロン放射(ECE)スペクトルであって、一般化されたキルヒホッフの法則が成り立つ電流を担う超熱電子テールを含むものについて、異常(X)モードおよび常(O)モードの両方に対して、プラズマ外側での垂直伝播および斜め伝播の両方の場合で評価を行った。高次の有限ラーマー半径効果と高調波の重なりの両方が考慮されている。プラズマ外部において第一高調波(XモードおよびOモードの両方)および第二高調波(Xモードのみ)のサイクロトロン周波数に下方シフトした周波数で生じるスペクトル的に狭い非熱的特徴に加えて、非熱的ECEは熱放射に対するスペクトル的に広い増強に寄与しており、非熱的ECEの顕著な特徴は平行屈折率に関する非対称性である。Xモードの上方シフトした第二高調波ECEの関連性について、光学的に厚いプラズマと光学的に薄いプラズマの両方における concomitant な下方シフトした第三高調波放射とともに議論する。

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Electron cyclotron emission
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