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ICRH power absorption measurements from analysis of RF sinusoidal low-frequency modulation experiments in TEXTOR

D Lebeau, R Koch, A M Messiaen, P E Vandenplas1995年Plasma Physics and Controlled FusionIF 2.2出版社

Modulation of the ICRH power amplitude has been performed sinusoidally in TEXTOR over a wide modulation frequency range in an (H)-D plasma. From an analysis of reproducible discharges in which the ICRH is modulated at a relatively high modulation frequency Omega /2 pi (50-300 Hz), we observe that only a fraction (about 50%) of the ICRH power is transferred to the plasma with a good energy confinement time. We also show that the analysis of a single modulated discharge already provides part of the information. The analysis is supported by a careful investigation of the non-stationary energy response obtained from the diamagnetic look and from the equilibrium measurement. The eigenfunction expansion of the transport equation for global energy in which each successive mode has a particular absorption coefficient and a decreasing confinement time indicates that about 50% of the ICRH power is coupled to the fundamental mode with the best confinement time. The remainder of the power goes to other modes with decreasing confinement times. Such a time-dependent analysis allows us therefore to distinguish between the fraction of the power absorbed by the core of the plasma (good confinement) and the fraction absorbed by the edge (bad confinement). The conclusions of this modulation analysis are qualitatively similar for high-field side (HFS) antennae with predominantly direct electron heating and for low-field side (LFS) antennae with predominantly minority-ion heating. In the second scenario, a detailed analysis has been provided to account for the anisotropic contribution to the energy of the minority ions.

日本語訳

ICRHパワー振幅の変調は、(H)-Dプラズマにおいて広い変調周波数範囲にわたってTEXTORで正弦波状に実施された。比較的高い変調周波数Ω/2π(50-300 Hz)でICRHが変調された再現性のある放電の解析から、ICRHパワーのごく一部(約50%)のみが良好なエネルギー閉じ込め時間でプラズマに伝達されることが観測された。また、単一の変調放電の解析がすでに情報の一部を提供することも示す。この解析は、ダイアマグネティック測定および平衡測定から得られた非定常エネルギー応答の注意深い調査によって裏付けられている。各モードが特定の吸収係数と減少する閉じ込め時間を有する大域エネルギーの輸送方程式の固有関数展開は、ICRHパワーの約50%が最良の閉じ込め時間を持つ基本モードに結合されることを示している。残りのパワーは、閉じ込め時間が減少する他のモードに分配される。このような時間依存解析により、プラズマコアに吸収されるパワーの割合(良好な閉じ込め)とエッジに吸収されるパワーの割合(不良な閉じ込め)を区別することが可能となる。この変調解析の結論は、主に直接電子加熱を行う高磁場側(HFS)アンテナと、主に少数イオン加熱を行う低磁場側(LFS)アンテナの両方について定性的に同様である。第二のシナリオでは、少数イオンのエネルギーへの異方性寄与を説明するための詳細な解析が提供されている。

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Ion cyclotron heatingTEXTOR
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