Neoclassical Toroidal Viscosity in Perturbed Equilibria with General Tokamak Geometry
Authors: Nikolas C. Logan, et. al.
Abstract:
This paper presents a calculation of neoclassical toroidal viscous (NTV) torque independent
of large-aspect-ratio expansions across kinetic regimes. The Perturbed
Equilibrium Nonambipolar Transport (PENT) code was developed for this purpose,
and is compared to previous combined regime models as well as regime specific limits
and a drift kinetic δf guiding center code. It is shown that retaining general expressions,
without circular large-aspect-ratio or other orbit approximations, can be
important at experimentally relevant aspect ratio and shaping. The superbanana
plateau, a kinetic resonance effect recently recognized for its relevance to ITER, is
recovered by the PENT calculations and shown to require highly accurate treatment
of geometric effects.
__________________________________________________
Submitted to:
Physics of Plasmas (October 2013)
__________________________________________________
Download PPPL-4957 (pdf 275 KB 17 pp)
__________________________________________________