Premium
Impact of safety factor and magnetic shear profiles on edge turbulence in circular limited geometry
Author(s) -
Nace N.,
Tamain P.,
Baudoin C.,
Bufferand H.,
Ciraolo G.,
Fedorczak N.,
Galassi D.,
Ghendrih Ph.,
Serre E.
Publication year - 2018
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201700174
Subject(s) - turbulence , limiter , physics , magnetic field , shear (geology) , geometry , mechanics , plasma , enhanced data rates for gsm evolution , safety factor , classical mechanics , materials science , mathematics , telecommunications , quantum mechanics , composite material , computer science , nuclear physics
The impact of magnetic configuration on edge turbulence properties in circular limiter geometry is investigated using TOKAM3X, a three‐dimensional (3D), first‐principle, fluid code for edge plasma. The theoretical spatial tilting of magnetic shear on turbulence fluctuations is recovered. Magnetic shear is found to generate or enhance poloidal high/low field sides (HFS/LFS) and up/down asymmetries. A simulation mimicking the impact of an X‐point on circular limiter geometry leads to the formation of two transport barriers that are stable in time, thus leading to the improvement of core particle confinement and to reduction of radial turbulent transport. The magnetic shear, which also strongly enhances the E × B shear, is responsible for the barrier formation.