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Stability of the resistive wall mode in HBT-EP plasmas

Phys. Plasmas 13, 072512 (2006); doi:10.1063/1.2245542

Published 31 July 2006

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Richard Fitzpatrick
Institute for Fusion Studies, Department of Physics, University of Texas at Austin, Austin, Texas 78712

James Bialek
Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027
A relatively simple model of the resistive wall mode (RWM) is derived for a large aspect ratio, low beta, circular cross section, tokamak plasma, surrounded by a concentric, thin, uniform resistive wall. The model employs uniform toroidal plasma rotation, and includes the following realistic edge dissipation mechanisms: dissipation due to charge-exchange with cold neutrals, and dissipation due to neoclassical flow damping. The model is applied to the HBT-EP tokamak [T. Ivers, E. Eisner, A. Garofalo et al., Phys. Plasmas 3, 1926 (1996)], with the wall parameters determined by fitting to output from the VALEN code [J. Bialek, A. H. Boozer, M. E. Mauel, and G. A. Navratil, Phys. Plasmas 8, 2170 (2001)]. Dissipation due to charge-exchange with cold neutrals is found to be not quite large enough to account for the observed rotational stabilization of the RWM in HBT-EP plasmas. On the other hand, dissipation due to neoclassical flow damping is sufficiently large to explain the observations. ©2006 American Institute of Physics
History: Received 25 April 2006; accepted 10 July 2006; published 31 July 2006
Permalink: http://link.aip.org/link/?PHPAEN/13/072512/1
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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.-q
    Plasma dynamics and flow
  • 52.25.Fi
    Plasma transport properties
  • YEAR: 2006

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1070-664X (print)   1089-7674 (online)
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REFERENCES (30)
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