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Title: Turbulent electron transport in edge pedestal by electron temperature gradient turbulence

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.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3]
  1. WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)
  2. (India)
  3. (United States)
Publication Date:
OSTI Identifier:
22218426
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 11; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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