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Title: Impact of relative phase shift on inward turbulent spreading

The relative cross-phase between density, temperature, and potential perturbations plays a major role in turbulent spreading and transport. Nonlinear Landau-Fluid simulations show that the electron wave-particle resonances provide a relatively strong parallel damping effect on the electron temperature perturbation and can induce a relative cross-phase shift of smaller than π∕2 angle between E × B velocity and the electron temperature perturbation for large electron temperature gradient, which yields a large spreading for electron. The relative phase for ions is about π∕2 and has no turbulent spreading effect on it. The inward turbulent spreading stops at the position where the radial turbulent correlation length is shorter than the magnetic surface spacing. The temperature pedestal height determines the energy loss due to the turbulent spreading.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [2]
  1. Fusion Simulation Center, School of Physics, Peking University, Beijing (China)
  2. (United States)
  3. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  4. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei (China)
Publication Date:
OSTI Identifier:
22407976
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 1; Other Information: (c) 2015 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; DISTURBANCES; ELECTRIC FIELDS; ELECTRON TEMPERATURE; ENERGY LOSSES; FLUID FLOW; IONS; MAGNETIC FIELDS; MAGNETIC SURFACES; NONLINEAR PROBLEMS; PHASE SHIFT; RESONANCE; SIMULATION; TEMPERATURE GRADIENTS; TURBULENCE