A Model of Peaked Density Profile and Inward Pinch in Tokamaks

Sanae I. Itoh

研究成果: Contribution to journalArticle査読

22 被引用数 (Scopus)

抄録

A model theory of inward pinch and peaked density profile of ohmic discharges in the tokamak is presented. Ion anomalous viscosity in the presence of sheared rotation causes the drift across the magnetic field. Radial electric field, Er, can cause an inward pinch of electrons as well. The ratio of viscosities and the diffusion coefficient, the Prandtl number, determines the structures of Er and the density profile n(r) in a stationary state. In viscous plasmas, peaked profiles of both density and rotation velocity are expected. Reduction of edge neutrals changes the boundary condition and can induce further density peaking. Change of dEr/dr propagates into the center, causing ion viscous heating associated with the damping of velocity shear.

本文言語英語
ページ(範囲)3431-3434
ページ数4
ジャーナルjournal of the physical society of japan
59
10
DOI
出版ステータス出版済み - 1 1 1990

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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