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|Title: ||Nature of Transport across Sheared Zonal Flows in Electrostatic Ion-Temperature-Gradient Gyrokinetic Plasma Turbulence|
|Author(s): ||Sánchez, Raúl|
Newman, David E.
Decyk, V. K.
Carreras, Benjamín A.
|Publisher: ||The American Physical Society|
|Issued date: ||14-Nov-2008|
|Citation: ||Phys. Rev. Lett. 101, 205002 (2008)|
|Description: ||4 pages, 4 figures.-- PACS nrs.: 52.35.Ra, 05.40.Fb, 52.55.Fa, 52.65.Tt.|
|Abstract: ||It is shown that the usual picture for the suppression of turbulent transport across a stable sheared flow based on a reduction of diffusive transport coefficients is, by itself, incomplete. By means of toroidal gyrokinetic simulations of electrostatic, collisionless ion-temperature-gradient turbulence, it is found that the nature of the transport is altered fundamentally, changing from diffusive to anticorrelated and subdiffusive. Additionally, whenever the flows are self-consistently driven by turbulence, the transport gains an additional non-Gaussian character. These results suggest that a description of transport across sheared flows using effective diffusivities is oversimplified.|
|Sponsor: ||Research carried out at ORNL, managed by UT-Battelle LLC, for US DOE under Contract No. DE-AC05-00OR22725. Research funded by DOE Office of Science Grants No. DE-FG02-04ER54741 at University of Alaska and No. DE-FG02-04ER54740 at UCLA.|
|Publisher version: ||http://dx.doi.org/10.1103/PhysRevLett.101.205002|
|Keywords: ||[PACS] Plasma turbulence|
[PACS] Random walks and Levy flights
[PACS] Tokamaks, spherical tokamaks
[PACS] Gyrofluid and gyrokinetic simulations
|Rights: ||© The American Physical Society|
|Appears in Collections:||DF - GFP - Artículos de revistas|
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