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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 x 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] ; ORCiD logo [2] ;  [1] ;  [3]
  1. Peking Univ., Beijing (China). School of Physics, Fusion Simulation Center and State Key Lab. of Nuclear Physics; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
Publication Date:
Report Number(s):
LLNL-JRNL-652541
Journal ID: ISSN 1070-664X
Grant/Contract Number:
AC52-07NA27344; AC52-7NA27344
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 1; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE; International Thermonuclear Experimental Reactor (ITER)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION
OSTI Identifier:
1305896
Alternate Identifier(s):
OSTI ID: 1228478