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Impact of safety factor and magnetic shear profiles on edge turbulence in circular limited geometry

Authors :
Nicolas Fedorczak
Eric Serre
Patrick Tamain
Philippe Ghendrih
C. Baudoin
Hugo Bufferand
N. Nace
Davide Galassi
Guido Ciraolo
Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2)
Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)
Institut de Recherche sur la Fusion par confinement Magnétique (IRFM)
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
CINECA. TGCC, A0010506912. GENCI IDRIS, x2016056912
ANR-11-IDEX-0001,Amidex,INITIATIVE D'EXCELLENCE AIX MARSEILLE UNIVERSITE(2011)
ANR-10-EQPX-0029,EQUIP@MESO,Equipement d'excellence de calcul intensif de Mesocentres coordonnés - Tremplin vers le calcul petaflopique et l'exascale(2010)
Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)
Source :
Contributions to Plasma Physics, Contributions to Plasma Physics, 2018, 58 (6-8), pp.497-504. ⟨10.1002/ctpp.201700174⟩, Contributions to Plasma Physics, Wiley-VCH Verlag, 2018, 58 (6-8), pp.497-504. ⟨10.1002/ctpp.201700174⟩
Publication Year :
2018
Publisher :
Wiley, 2018.

Abstract

International audience; 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.

Details

ISSN :
08631042 and 15213986
Volume :
58
Database :
OpenAIRE
Journal :
Contributions to Plasma Physics
Accession number :
edsair.doi.dedup.....e9ee384592a1f783d3dc3f32ceb79c30
Full Text :
https://doi.org/10.1002/ctpp.201700174