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Title: Radial discontinuities in tokamak magnetohydrodynamic equilibria with poloidal flow

Abstract

It is shown that transonic poloidal flow leads to ideal magnetohydrodynamic tokamak equilibria with radial discontinuities in the density, pressure, and flow velocity profiles. Transonic profiles are defined as having flow velocities ranging from subsonic to supersonic with respect to the poloidal sound speed (c{sub s}B{sub p}/B). The jump of the equilibrium quantities occurs approximately at the sonic surface and its magnitude is of order {epsilon}{sup 1/2} ({epsilon} is the inverse aspect ratio). Because of the large velocity shear at the sonic surface, transonic profiles may improve energy confinement as suggested by current understanding of tokamak plasma turbulence suppression. (c) 2000 American Institute of Physics.

Authors:
 [1];  [2]
  1. Laboratory for Laser Energetics, and Departments of Mechanical Engineering, and Physics and Astronomy, University of Rochester, Rochester, New York 14623 (United States)
  2. Department of Nuclear Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
20216541
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 7; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MAGNETOHYDRODYNAMICS; TOKAMAK DEVICES; PLASMA CONFINEMENT; PLASMA DENSITY; TURBULENCE; TURBULENT FLOW; SUPERSONIC FLOW; THEORETICAL DATA

Citation Formats

Betti, R., and Freidberg, J. P. Radial discontinuities in tokamak magnetohydrodynamic equilibria with poloidal flow. United States: N. p., 2000. Web. doi:10.1063/1.874083.
Betti, R., & Freidberg, J. P. Radial discontinuities in tokamak magnetohydrodynamic equilibria with poloidal flow. United States. doi:10.1063/1.874083.
Betti, R., and Freidberg, J. P. Thu . "Radial discontinuities in tokamak magnetohydrodynamic equilibria with poloidal flow". United States. doi:10.1063/1.874083.
@article{osti_20216541,
title = {Radial discontinuities in tokamak magnetohydrodynamic equilibria with poloidal flow},
author = {Betti, R. and Freidberg, J. P.},
abstractNote = {It is shown that transonic poloidal flow leads to ideal magnetohydrodynamic tokamak equilibria with radial discontinuities in the density, pressure, and flow velocity profiles. Transonic profiles are defined as having flow velocities ranging from subsonic to supersonic with respect to the poloidal sound speed (c{sub s}B{sub p}/B). The jump of the equilibrium quantities occurs approximately at the sonic surface and its magnitude is of order {epsilon}{sup 1/2} ({epsilon} is the inverse aspect ratio). Because of the large velocity shear at the sonic surface, transonic profiles may improve energy confinement as suggested by current understanding of tokamak plasma turbulence suppression. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.874083},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 6,
volume = 7,
place = {United States},
year = {2000},
month = {6}
}