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Abstract
The toroidal torque driven by external nonresonant magnetic perturbations (neoclassical toroidal viscosity) is an important momentum source affecting the toroidal plasma rotation in tokamaks. The wellknown forceflux relation directly links this torque to the nonambipolar neoclassical particle fluxes arising due to the violation of the toroidal symmetry of the magnetic field. Here, a quasilinear approach for the numerical computation of these fluxes is described, which reduces the dimension of a standard neoclassical transport problem by one without model simplifications of the linearized drift kinetic equation. The only limiting condition is that the nonaxisymmetric perturbation field is small enough such that the effect of the perturbation field on particle motion within the flux surface is negligible. Therefore, in addition to most of the transport regimes described by the banana (bounce averaged) kinetic equation also such regimes as, e.g., rippleplateau and resonant diffusion regimes are naturally included in this approach. Based on this approach, a quasilinear version of the code NEO2 [W. Kernbichler et al., Plasma Fusion Res. 3, S1061 (2008).] has been developed and benchmarked against a few analytical and numerical models. Results from NEO2 stay in good agreement with results from these models in their pertinent range of validity.
Original language  English 

Article number  092506 
Journal  Physics of Plasmas 
Volume  21 
DOIs  
Publication status  Published  2014 
Fields of Expertise
 Information, Communication & Computing
Treatment code (Nähere Zuordnung)
 Theoretical
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 1 Finished

EU  Transport Heating in Toroidal Device  Transport and Heating in Toroidal Devices (ÖAWEURATOM)
Allmaier, K., Heyn, M., Nyemov, V., Seiwald, B., Kernbichler, W., Leitold, G., Kasilov, S. & Ivanov, I. B.
1/01/96 → 31/12/20
Project: Research project