2013/09/30 by István Pusztai, Matt Landreman, A. Mollén +4 · 6 citations
Physics and Astronomy · #Computational physics #Computer science #Impurity #Ionosphere and magnetosphere dynamics #Laser-Plasma Interactions and Diagnostics #Magnetic confinement fusion research #Mechanics #Nuclear physics #Physics #Plasma #Quantum mechanics #Radio frequency #Telecommunications #Tokamak #Turbulence #physics.plasm-ph
paper · pdf · doi:10.1002/ctpp.201410012
published in Contributions to Plasma Physics 54(4-6), 534-542 (Wiley) · Paper for 14th International Workshop on Plasma Edge Theory in Fusion Devices, revised version, submitted
arxiv created 2013/11/20 · openalex publication_date 2014/06/01 · arxiv updated 2015/10/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract Poloidal asymmetries in the impurity density can be generated by radio frequency heating in the core and by neoclassical effects in the edge of tokamak plasmas. In a pedestal case study, using global neoclassical simulations we find that finite orbit width effects can generate significant poloidal variation in the electrostatic potential, which varies on a small radial scale. Gyrokinetic modeling shows that these poloidal asymmetries can be strong enough to significantly modify turbulent impurity peaking. In the pedestal the E × B drift in the radial electric field can give a larger contribution to the poloidal motion of impurities than that of their parallel streaming. Under such circumstances we find that up‐down asymmetries can also affect impurity peaking. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)