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Dynamic transport study of heat and momentum transport in a plasma with improved ion confinement in the Large Helical Device

H Lee, K Ida, M Osakabe, M Yokoyama, C Suzuki, K Nagaoka, R Seki, M Yoshinuma, N Tamura, LHD Experiment Group2013年Plasma Physics and Controlled FusionIF 2.2出版社

Dynamic transport study taking account of the slowing-down effect on the neutral beam injection heating is applied to a high ion temperature plasma with an ion internal transport barrier (ITB) obtained by carbon pellet injection, which records the highest ion temperature of around ∼7 keV in the Large Helical Device. The transient increase in ion heating is clarified during the density decay phase just after the carbon pellet injection by considering the slowing-down effect. The dynamic transport analysis also includes the change in heat flux due to the change in kinetic energy inside the plasma with the time scale of the global energy confinement time, which is required to investigate the heat and momentum transport during the transient phase more exactly. The characteristics of the ion heat and momentum transport improvement during the ion ITB formation phase are clarified by the dynamic transport study.

日本語訳

中性粒子ビーム入射加熱における減速効果を考慮した動的輸送研究を、炭素ペレット入射によって得られたイオン内部輸送障壁(ITB)を有する高イオン温度プラズマに適用した。このプラズマは、大型ヘリカル装置において約7 keVの最高イオン温度を記録したものである。減速効果を考慮することにより、炭素ペレット入射直後の密度減衰期におけるイオン加熱の過渡的増大が明らかにされた。この動的輸送解析には、過渡期における熱・運動量輸送をより正確に調査するために必要となる、大域的エネルギー閉じ込め時間の時間スケールでのプラズマ内部の運動エネルギー変化に伴う熱流束の変化も含まれている。動的輸送研究により、イオンITB形成期におけるイオン熱・運動量輸送の改善特性が明らかにされた。

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lhd高精度(タイトル一致)

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Helical deviceMomentum transport
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