Reduction of Turbulent Transport with Zonal Flows Enhanced in Helical Systems

Journal Article · Fri May 16 04:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.100.195002· OSTI ID:21132422

Watanabe, T -H; Sugama, H ^[1]; Ferrando-Margalet, S ^[1]

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1. National Institute for Fusion Science Toki, Gifu, 509-5292 (Japan)

Gyrokinetic Vlasov simulations of the ion temperature gradient turbulence are performed in order to investigate effects of helical magnetic configurations on turbulent transport and zonal flows. The obtained results confirm the theoretical prediction that helical configurations optimized for reducing neoclassical ripple transport can simultaneously reduce the turbulent transport with enhancing zonal-flow generation. Stationary zonal-flow structures accompanied with transport reduction are clearly identified by the simulation for the neoclassically optimized helical geometry. The generation of the stationary zonal flow explains a physical mechanism for causing the confinement improvement observed in the inward-shifted plasma in the Large Helical Device [O. Motojima et al., Nucl. Fusion 43, 1674 (2003)].

• OSTI ID: 21132422
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 100; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
GEOMETRY
HELICAL CONFIGURATION
ION TEMPERATURE
LHD DEVICE
NEOCLASSICAL TRANSPORT THEORY
PLASMA
PLASMA CONFINEMENT
SIMULATION
TEMPERATURE GRADIENTS
TURBULENCE