{delta}f Monte Carlo calculation of neoclassical transport in perturbed tokamaks

Journal Article · Wed Aug 15 00:00:00 EDT 2012 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4740511· OSTI ID:22086031

Kim, Kimin; Park, Jong-Kyu; Kramer, Gerrit J ^[1]; Boozer, Allen H ^[2]

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1. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
2. Columbia University, New York, New York 10027 (United States)

Non-axisymmetric magnetic perturbations can fundamentally change neoclassical transport in tokamaks by distorting particle orbits on deformed or broken flux surfaces. This so-called non-ambipolar transport is highly complex, and eventually a numerical simulation is required to achieve its precise description and understanding. A new {delta}f particle orbit code (POCA) has been developed for this purpose using a modified pitch-angle collision operator preserving momentum conservation. POCA was successfully benchmarked for neoclassical transport and momentum conservation in the axisymmetric configuration. Non-ambipolar particle flux is calculated in the non-axisymmetric case, and the results show a clear resonant nature of non-ambipolar transport and magnetic braking. Neoclassical toroidal viscosity (NTV) torque is calculated using anisotropic pressures and magnetic field spectrum, and compared with the combined and 1/{nu} NTV theory. Calculations indicate a clear {delta}B{sup 2} scaling of NTV, and good agreement with the theory on NTV torque profiles and amplitudes depending on collisionality.

• OSTI ID: 22086031
• Journal Information: Physics of Plasmas, Vol. 19, Issue 8; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
AXIAL SYMMETRY
BENCHMARKS
COMPUTERIZED SIMULATION
DISTURBANCES
INCLINATION
MAGNETIC FIELDS
MAGNETIC SURFACES
MONTE CARLO METHOD
NEOCLASSICAL TRANSPORT THEORY
ORBITS
PARTICLES
SCALING
TOKAMAK DEVICES
TOROIDAL CONFIGURATION
TORQUE
VISCOSITY