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Self-consistent description of L-H mode transition dynamics in tokamaks

I.A. Vojtsekhovich, A.Yu. Dnestrovskij, V.V. Parail1995年被引用 12Nuclear FusionIF 3出版社

A theoretical model of L-H transition in a tokamak, based on the self-consistent analysis of plasma transport and taking the suppression of anomalous transport by sheared poloidal plasma rotation and the establishment of a radial electric field due to non-ambipolar particle transport into account, is presented. The transition to an improved confinement regime for a plasma with or without suprathermal electron component is studied. A numerical simulation shows that this model adequately describes the main, experimentally observed features of L-H transition dynamics during electron cyclotron or lower hybrid heating. It is also shown that in certain conditions such a transition can be 'auto-oscillatory', which may be considered as an ELMs feature. The dependence of the localization region of the ELMs and their characteristics (frequency and magnitude) on the plasma parameters are investigated

日本語訳

トカマクにおけるL-H遷移の理論モデルを提示する。このモデルは、プラズマ輸送の自己無撞着解析に基づき、シアを有するポロイダル回転による異常輸送の抑制と、非両極性粒子輸送による径方向電場の形成を考慮する。超熱電子成分を有する場合と有しない場合のプラズマについて、閉じ込め改善モードへの遷移を研究する。数値シミュレーションにより、このモデルが電子サイクロトロン加熱または低域混成波加熱中のL-H遷移ダイナミクスの主な実験的観測特徴を適切に記述できることを示す。また、特定の条件下では、このような遷移が「自動振動的」になり得ることを示し、これはELMの特徴と見なすことができる。ELMの局在領域とその特性(周波数および振幅)のプラズマパラメータへの依存性を調査する。

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L-H transition
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