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 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.
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February 2007
Research Article|
February 20 2007
Effect of an error field on the stability of the resistive wall mode
Richard Fitzpatrick
Richard Fitzpatrick
Institute for Fusion Studies, Department of Physics,
University of Texas at Austin
, Austin, Texas 78712
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Phys. Plasmas 14, 022505 (2007)
Article history
Received:
October 26 2006
Accepted:
January 10 2007
Citation
Richard Fitzpatrick; Effect of an error field on the stability of the resistive wall mode. Phys. Plasmas 1 February 2007; 14 (2): 022505. https://doi.org/10.1063/1.2446041
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