Origin and Evolution of Spontaneous Rotation in Plasma under Different Magnetic Field Geometries in Tokamak QUEST

QUEST Team

研究成果: Contribution to journalArticle査読

4 被引用数 (Scopus)

抄録

Spontaneous toroidal rotation of the plasma is observed in the spherical tokamak QUEST with the help of electron cyclotron resonance (ECR) heating and without the use of any externally injected momentum. Several vertical magnetic field ( Bz) configurations with varying mirror ratio (M) (a measure of field curvature) are applied and evolution of rotation is studied with the help of Doppler spectroscopy of bulk and impurity ions. Significant toroidal rotation (Vφ-6km/s) is initiated in the open magnetic field configuration during the initial plasma breakdown phase, which is later sustained ( Vφ- 20km/s) in a closed magnetic field configuration in steady state. Rotational velocity is primarily along the cocurrent direction and is found to be proportional to the Bz strength and the resulting plasma current. High M and Bz are demonstrated to be the two specific external controls by which rotation can be initiated in the plasma. The rotation in open field lines is found to be initiated at the ECR layer in the slablike plasma, which is evolved to produce a sustained rotation in the natural divertor inboard poloidal field null equilibrium in QUEST.

本文言語英語
論文番号7416222
ページ(範囲)441-447
ページ数7
ジャーナルIEEE Transactions on Plasma Science
44
4
DOI
出版ステータス出版済み - 4 2016

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学
  • 凝縮系物理学

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