A relatively simple model of the resistive wall mode (RWM) is derived for a large aspect ratio, low , 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.
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July 2006
Research Article|
July 31 2006
Stability of the resistive wall mode in HBT-EP plasmas
Richard Fitzpatrick;
Richard Fitzpatrick
Institute for Fusion Studies, Department of Physics,
University of Texas at Austin
, Austin, Texas 78712
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James Bialek
James Bialek
Department of Applied Physics and Applied Mathematics,
Columbia University
, New York, New York 10027
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Phys. Plasmas 13, 072512 (2006)
Article history
Received:
April 25 2006
Accepted:
July 10 2006
Citation
Richard Fitzpatrick, James Bialek; Stability of the resistive wall mode in HBT-EP plasmas. Phys. Plasmas 1 July 2006; 13 (7): 072512. https://doi.org/10.1063/1.2245542
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