%AKimin Kim, Jong-Kyu Park and Allen H. Boozer
%B
%D2013%IPhysical Review Letters (Novembe r2012); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
%K70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Tokamaks, Numerical Verification
%MOSTI ID: 1074353
%PMedium: ED
%TNumerical Verification of Bounce Harmonic Resonances in Neoclassical Toroidal Viscosity for Tokamaks
%Uhttp://www.osti.gov/scitech//servlets/purl/1074353/
%XThis Letter presents the rst numerical veri cation for the bounce-harmonic (BH) resonance phenomena of the neoclassical transport in a tokamak perturbed by non-axisymmetric magnetic elds. The BH resonances were predicted by analytic theories of neoclassical toroidal viscosity (NTV), as the parallel and perpendicular drift motions can be resonant and result in a great enhancement of the radial momentum transport. A new drift-kinetic f guiding-center particle code, POCA, clearly veri ed that the perpendicular drift motions can reduce the transport by phase-mixing, but in the BH resonances the motions can form closed orbits and particles radially drift out fast. The POCA calculations on resulting NTV torque are largely consistent with analytic calculations, and show that the BH resonances can easily dominate the NTV torque when a plasma rotates in the perturbed tokamak and therefore is a critical physics for predicting the rotation and stability in ITER.
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%0Technical Report
%@PPPL-4867
United States10.2172/1074353Thu Apr 25 07:20:54 EDT 2013PPPLEnglish