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Effect of an error field on the stability of the resistive wall mode

Phys. Plasmas 14, 022505 (2007); doi:10.1063/1.2446041

Published 20 February 2007

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Richard Fitzpatrick
Institute for Fusion Studies, Department of Physics, University of Texas at Austin, Austin, Texas 78712
A simple model of the resistive wall mode (RWM) in a rotating tokamak plasma subject to a static error field is constructed, and then used to investigate RWM stability in a DIII-D–like [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] plasma. An error field as small as 10 G (i.e., about 5×10−4 of the toroidal field) is found to significantly increase the critical plasma rotation frequency needed to stabilize the RWM. Such an error field also profoundly changes the nature of the RWM onset. At small error-field amplitudes, the RWM switches on gradually as the plasma rotation is gradually reduced. On the other hand, at large error-field amplitudes, there is a sudden collapse of the plasma rotation as the rotation frequency falls below some critical value. This collapse is associated with a very rapid switch-on of the RWM. ©2007 American Institute of Physics
History: Received 26 October 2006; accepted 10 January 2007; published 20 February 2007
Permalink: http://link.aip.org/link/?PHPAEN/14/022505/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.35.Py
    Plasma macroinstabilities (hydromagnetic) e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor instabilities, etc
  • 52.40.Hf
    Plasma–material interactions; boundary layer effects
  • 52.55.Fa
    Tokamaks
  • 52.55.Tn
    Ideal and resistive plasma MHD modes; kinetic modes
  • 52.30.Cv
    Plasma magnetohydrodynamics including electron magnetohydrodynamics
  • YEAR: 2007

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ISSN:
1070-664X (print)   1089-7674 (online)
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REFERENCES (29)
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