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Lower hybrid ion heating in the presence of drift wave turbulence

G Derra, J Kaiser, H Schluter1988年Plasma Physics and Controlled FusionIF 2.2出版社

Lower hybrid wave heating has been investigated in a low-density stellarator plasma (Bo=0.288 T, ne=1017 m-3, kTeo=4.2 eV, kTio=2.0 eV) in the presence of strong drift wave turbulence. Time-resolved and local measurements of ion temperature were achieved by a small electrostatic ion energy analyzer. Radial profiles of heating rate and energy confinement time were measured. From a simple local ion energy balance equation, the radial profile of power gained by the ions from the LH-wave field is computed. The result is compared to the predictions of various possible heating mechanisms. Classical collisional damping of the LH-wave by far (2-3 orders of magnitude) underestimates the observed ion heating. Landau damping, stochastic heating, parametric effects and d.c.-fields are found to underestimate the experimental values by at least one order of magnitude as well.

日本語訳

低混成波加熱が、強いドリフト波乱流の存在下にある低密度ステラレータープラズマ(Bo=0.288 T、ne=10^17 m^-3、kTeo=4.2 eV、kTio=2.0 eV)において調査された。イオン温度の時間分解・空間分解測定は、小型静電イオンエネルギーアナライザーによって達成された。加熱率とエネルギー閉じ込め時間の動径プロファイルが測定された。単純な局所イオンエネルギー収支式から、LH波の場からイオンが獲得するパワーの動径プロファイルが計算された。その結果は、様々な可能な加熱機構の予測と比較された。LH波の古典的衝突減衰は、観測されたイオン加熱を大幅に(2〜3桁)過小評価する。ランダウ減衰、確率加熱、パラメトリック効果、および直流電場も、実験値を少なくとも1桁過小評価することが見出された。

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Lower hybridDrift wavesIon heatingDrift wave turbulence
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