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Experimental studies of structural bifurcation in stellarator plasmas

Akihide Fujisawa2003年Plasma Physics and Controlled FusionIF 2.2出版社

This review presents experimental studies on improved confinement (IC) modes observed mainly in stellarator plasmas. The IC modes result from structural bifurcation, often accompanied with discrete and sudden changes in electromagnetic and thermodynamic structures. The phenomenology of the bifurcated states occurring in various stellarator configurations is described with the fundamental experimental observations associated with the mechanisms of bifurcation and confinement improvements. Particular emphasis is placed on the physics of radial electric field, which is a key quantity that leads toroidal plasmas to structural bifurcation. Neoclassical (-driven) transport barriers commonly observed in stellarators are highlighted.

日本語訳

本レビューでは、主にステラレータプラズマにおいて観測される改善閉じ込め(IC)モードに関する実験的研究を提示する。ICモードは構造分岐に起因し、電磁的・熱力学的構造の離散的かつ急激な変化を伴うことが多い。様々なステラレータ配位において発生する分岐状態の現象論を、分岐および閉じ込め改善のメカニズムに関連する基礎的な実験観測とともに記述する。特に、トーラスプラズマを構造分岐に導く主要な物理量である径方向電場の物理に重点を置く。ステラレータにおいて一般的に観測される新古典輸送駆動の輸送障壁に焦点を当てる。

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