A MODEL OF PEAKED DENSITY PROFILE AND INWARD PINCH IN TOKAMAKS

被引：25

作者：

ITOH, SI

机构：

[1] National Institute for Fusion Science

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1990年 / 59卷 / 10期

关键词：

D O I：

10.1143/JPSJ.59.3431

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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. © 1990, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

引用

页码：3431 / 3434

页数：4

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