Effect of neoclassical toroidal viscosity on error-field penetration thresholds in tokamak plasmas |
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Authors: | Cole A J Hegna C C Callen J D |
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Institution: | University of Wisconsin, Madison, Wisconsin 53706-1609, USA. |
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Abstract: | A model for field-error penetration is developed that includes nonresonant as well as the usual resonant field-error effects. The nonresonant components cause a neoclassical toroidal viscous torque that keeps the plasma rotating at a rate comparable to the ion diamagnetic frequency. The new theory is used to examine resonant error-field penetration threshold scaling in Ohmic tokamak plasmas. Compared to previous theoretical results, we find the plasma is less susceptible to error-field penetration and locking, by a factor that depends on the nonresonant error-field amplitude. |
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