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Title: Resistive X-point modes in tokamak boundary plasmas

Abstract

It is shown that the boundary (edge and scrape-off-layer) plasma in a typical low (L) mode diverted tokamak discharge is unstable to a new class of modes called resistive X-point (RX) modes. The RX mode is a type of resistive ballooning mode that exploits a synergism between resistivity and the magnetic geometry of the X-point region. The RX modes are shown to give robust instabilities at moderate mode numbers, and therefore are expected to be the dominant contributors to turbulent diffusion in the boundary plasma of a diverted tokamak. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [2];  [2]
  1. Lodestar Research Corporation, 2400 Central Avenue, Boulder, Colorado 80301 (United States)
  2. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
20216537
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; TOKAMAK DEVICES; BOUNDARY LAYERS; BALLOONING INSTABILITY; MAGNETIC CONFINEMENT; TURBULENCE; CHARGED-PARTICLE TRANSPORT; THEORETICAL DATA

Citation Formats

Myra, J. R., D'Ippolito, D. A., Xu, X. Q., and Cohen, R. H. Resistive X-point modes in tokamak boundary plasmas. United States: N. p., 2000. Web. doi:10.1063/1.874125.
Myra, J. R., D'Ippolito, D. A., Xu, X. Q., & Cohen, R. H. Resistive X-point modes in tokamak boundary plasmas. United States. doi:10.1063/1.874125.
Myra, J. R., D'Ippolito, D. A., Xu, X. Q., and Cohen, R. H. Thu . "Resistive X-point modes in tokamak boundary plasmas". United States. doi:10.1063/1.874125.
@article{osti_20216537,
title = {Resistive X-point modes in tokamak boundary plasmas},
author = {Myra, J. R. and D'Ippolito, D. A. and Xu, X. Q. and Cohen, R. H.},
abstractNote = {It is shown that the boundary (edge and scrape-off-layer) plasma in a typical low (L) mode diverted tokamak discharge is unstable to a new class of modes called resistive X-point (RX) modes. The RX mode is a type of resistive ballooning mode that exploits a synergism between resistivity and the magnetic geometry of the X-point region. The RX modes are shown to give robust instabilities at moderate mode numbers, and therefore are expected to be the dominant contributors to turbulent diffusion in the boundary plasma of a diverted tokamak. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.874125},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 6,
volume = 7,
place = {United States},
year = {2000},
month = {6}
}