Turbulent electron transport in edge pedestal by electron temperature gradient turbulence

Journal Article · Fri Nov 15 00:00:00 EST 2013 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4829673· OSTI ID:22218426

Singh, R. ^[1]; Jhang, Hogun ^[1]; Diamond, P. H. ^[1]

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1. WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)

We present a model for turbulent electron thermal transport at the edge pedestal in high (H)-mode plasmas based on electron temperature gradient (ETG) turbulence. A quasi-linear analysis of electrostatic toroidal ETG modes shows that both turbulent electron thermal diffusivity and hyper-resistivity exhibits the Ohkawa scaling in which the radial correlation length of turbulence becomes the order of electron skin depth. Combination of the Ohkawa scales and the plasma current dependence results in a novel confinement scaling inside the pedestal region. It is also shown that ETG turbulence induces a thermoelectric pinch, which may accelerate the density pedestal formation.

• OSTI ID: 22218426
• Journal Information: Physics of Plasmas, Vol. 20, Issue 11; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOUNDARY LAYERS
CORRELATIONS
ELECTRIC CURRENTS
ELECTRON TEMPERATURE
ELECTRONS
H-MODE PLASMA CONFINEMENT
ION TEMPERATURE
PINCH EFFECT
PLASMA
PLASMA DENSITY
TEMPERATURE GRADIENTS
THERMAL DIFFUSIVITY
THERMONUCLEAR REACTORS
TURBULENCE