Impact of relative phase shift on inward turbulent spreading

Ma, C. H.; Xi, P. W.; Xu, X. Q.; Xia, T. Y.

doi:10.1063/1.4905644

Title: Impact of relative phase shift on inward turbulent spreading

Journal Article · Thu Jan 15 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4905644· OSTI ID:22407976

Ma, C. H.; Xi, P. W. ^[1]; Xu, X. Q. ^[2]; Xia, T. Y. ^[3]

Fusion Simulation Center, School of Physics, Peking University, Beijing (China)
Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei (China)

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.

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OSTI ID:: 22407976

Journal Information:: Physics of Plasmas, Vol. 22, Issue 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X

Country of Publication:: United States

Language:: English

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