Streamer-induced transport in the presence of trapped ion modes in tokamak plasmas

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3474955· OSTI ID:21432275

Ghizzo, A; Del Sarto, D ^[1]; Garbet, X; Sarazin, Y ^[2]

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1. IJL UMR 7163, Nancy-Universites EPCS, BP 239, F-54506 Vandoeuvre les Nancy (France)
2. IRFM, CEA Cadarache, 13108 St. Paul-Les-Durance (France)

Global gyrokinetic Vlasov simulations for trapped ion modes are performed by solving a Vlasov equation averaged over the cyclotron and bounce motions of trapped ions. The distribution function, for trapped ions, is then calculated in a two-dimensional phase space, parametrized by the longitudinal action (energy) and the magnetic moment in presence of magnetic shear. The physical mechanism of the saturation processes between streamerlike structures and zonal flows in relation to the suppression of turbulent transport is discussed. The magnetic shear is identified to play a key role in the dominant streamer-induced transport regime, which exhibits a Bohm-like scaling. The interaction of streamerlike structures with plasma turbulence is shown to produce the inverse cascade that condenses onto long-wavelength trapped ion structures, on the basis on wave triad interactions.

• OSTI ID: 21432275
• Journal Information: Physics of Plasmas, Vol. 17, Issue 9; Other Information: DOI: 10.1063/1.3474955; (c) 2010 American Institute of Physics; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOLTZMANN-VLASOV EQUATION
DISTRIBUTION FUNCTIONS
IONS
MAGNETIC MOMENTS
PHASE SPACE
PLASMA
PLASMA SIMULATION
SHEAR
TOKAMAK DEVICES
TURBULENCE
TWO-DIMENSIONAL CALCULATIONS
CHARGED PARTICLES
CLOSED PLASMA DEVICES
DIFFERENTIAL EQUATIONS
EQUATIONS
FUNCTIONS
MATHEMATICAL SPACE
PARTIAL DIFFERENTIAL EQUATIONS
SIMULATION
SPACE
THERMONUCLEAR DEVICES