Effect of Neoclassical Toroidal Viscosity on Error-Field Penetration Thresholds in Tokamak Plasmas

Journal Article · Fri Aug 10 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.065001· OSTI ID:20957940

Cole, A J; Hegna, C C; Callen, J D ^[1]

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1. University of Wisconsin, Madison, Wisconsin 53706-1609 (United States)

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.

• OSTI ID: 20957940
• Journal Information: Physical Review Letters, Vol. 99, Issue 6; Other Information: DOI: 10.1103/PhysRevLett.99.065001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ERRORS
IONS
NEOCLASSICAL TRANSPORT THEORY
PLASMA
TOKAMAK DEVICES
TORQUE
VISCOSITY