A Model of Peaked Density Profile and Inward Pinch in Tokamaks

Sanae Itoh

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3431-3434
Number of pages4
Journaljournal of the physical society of japan
Volume59
Issue number10
DOIs
Publication statusPublished - Jan 1 1990

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profiles
viscosity
causes
Prandtl number
ions
diffusion coefficient
damping
boundary conditions
shear
heating
electric fields
magnetic fields
electrons

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

A Model of Peaked Density Profile and Inward Pinch in Tokamaks. / Itoh, Sanae.

In: journal of the physical society of japan, Vol. 59, No. 10, 01.01.1990, p. 3431-3434.

Research output: Contribution to journalArticle

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