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An approximate analytic expression for neoclassical toroidal plasma viscosity in tokamaks
Nuclear Fusion, 2010An approximate analytic expression for neoclassical toroidal plasma viscosity in tokamaks that have error fields or magnetohydrodynamic activities is presented. The expression smoothly joins transport fluxes or plasma viscosity in all the known collisionality regimes derived from the solution of the bounce averaged drift kinetic equation and should be ...
K.C. Shaing, S.A. Sabbagh, M.S. Chu
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Parallel viscosity‐driven neoclassical fluxes in the banana regime in nonsymmetric toroidal plasmas
Physics of Fluids, 1986Analytic expressions for the parallel viscosity-driven neoclassical fluxes in the banana regime in arbitrary nonsymmetric toroidal plasmas are derived without considering boundary layer effects. They can be evaluated numerically if the Fourier decomposition of the strength of the magnetic field ‖B‖ is known.
K C Shaing, J S Tolliver, S P Hirshman
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Intrinsic plasma rotation determined by neoclassical toroidal plasma viscosity in tokamaks
Nuclear Fusion, 2013 Intrinsic toroidal plasma rotation due to the neoclassical toroidal plasma viscosity (NTV) effect induced by a three-dimensional helical magnetic field ripple in tokamaks is investigated in this paper. The intrinsic rotation is determined self-consistently by searching for the roots of the ambipolarity constraint, after evaluation of the particle ...
Y. Sun +6 more
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Physics of Plasmas, 2015
Theory for neoclassical toroidal plasma viscosity in the low collisionality regime is extended to the vicinity of the magnetic axis in tokamaks with broken symmetry. The toroidal viscosity is induced by particles drifting off the perturbed magnetic surface under the influence of the symmetry breaking magnetic field. In the region away from the magnetic
JaeChun Seol, K C Shaing, A Y Aydemir
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Theory for neoclassical toroidal plasma viscosity in the low collisionality regime is extended to the vicinity of the magnetic axis in tokamaks with broken symmetry. The toroidal viscosity is induced by particles drifting off the perturbed magnetic surface under the influence of the symmetry breaking magnetic field. In the region away from the magnetic
JaeChun Seol, K C Shaing, A Y Aydemir
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How to calculate the neoclassical viscosity, diffusion, and current coefficients in general toroidal plasmas [PDF]
Physics of Plasmas, 2002 A novel method to obtain the full neoclassical transport matrix for general toroidal plasmas by using the solution of the linearized drift kinetic equation with the pitch-angle-scattering collision operator is shown.
H Sugama
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Neoclassical Viscosities in NCSX and QPS with Few Toroidal Periods and Low Aspect Ratios [PDF]
Plasma and Fusion Research, 2008 Previously reported benchmarking examples of the analytical formulae of neoclassical viscosities were presented implicitly assuming applications in a future integrated simulation system of the Large Helical Device (LHD).
Donald A. Spong
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Verification of neoclassical toroidal viscosity induced by energetic particles
Physics of Plasmas, 2022The thermal particles contributed neoclassical toroidal viscosity (NTV) have been successfully developed and explored by many impressive works such as the study by Shaing et al. [Phys. Plasmas 10, 1443 (2003)] and Zhu et al. [Phys. Rev. Lett. 96, 225002 (2006)].
Z. R. Wang +7 more
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Calculation of neoclassical toroidal viscosity in tokamaks with broken toroidal symmetry
Plasma Physics and Controlled Fusion, 2011A new numerical simulation to evaluate neoclassical toroidal viscosity (NTV) in tokamak configurations with a small perturbation field is developed using the ?f Monte Carlo method. The numerical scheme solves the guiding-centre distribution function in non-axisymmetric plasmas according to the drift-kinetic equation, and evaluates the NTV directly from
Shinsuke Satake +3 more
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Theory for neoclassical toroidal plasma viscosity in tokamaks
Plasma Physics and Controlled Fusion, 2012Error fields and magnetohydrodynamic modes break toroidal symmetry in tokamaks. The broken symmetry enhances the toroidal plasma viscosity, which results in a steady-state toroidal plasma flow. A theory for neoclassical toroidal plasma viscosity in the low-collisionality regimes is developed.
K C Shaing +5 more
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Neoclassical toroidal viscosity torque prediction via deep learning
Nuclear Fusion, 2021Abstract GPECnet is a densely connected neural network that has been trained on GPEC data, to predict the plasma stability, neoclassical toroidal viscosity (NTV) torque, and optimized 3D coil current distributions for desired NTV torque profiles.
M.D. Clement, N.C. Logan, M.D. Boyer
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