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|Title: ||On the nature of transport in near-critical dissipative-trapped-electron-mode turbulence: Effect of a subdominant diffusive channel|
|Author(s): ||Mier, José Ángel|
García Gonzalo, Luis
Newman, David E.
Carreras, Benjamín A.
|Publisher: ||American Institute of Physics|
|Issued date: ||Nov-2008|
|Citation: ||Physics of Plasmas, 2008, vol. 15, n. 11, id 112301|
|ISSN: ||1070-664X (Print)|
|Description: ||9 pages, 4 figures.-- PACS nrs.: 52.35.Ra, 52.55.-s.|
|Abstract: ||The change in nature of radial transport in numerical simulations of near-critical dissipative-trapped-electron-mode turbulence is characterized as the relative strength of an additional diffusive transport channel (subdominant to turbulence) is increased from zero. In its absence, radial transport exhibits the lack of spatial and temporal scales characteristic of self-organized-critical systems. This dynamical regime survives up to diffusivity values which, for the system investigated here, greatly exceeds the expected neoclassical value. These results, obtained using a novel Lagrangian method, complete and extend previous works based instead on the use of techniques imported from the study of cellular automata [ J. A. Mier et al., Phys. Plasmas 13, 102308 (2006) ]. They also shed further light on why some features of self-organized criticality seem to be observed in magnetically confined plasmas in spite of the presence of mechanisms which apparently violate the conditions needed for its establishment.|
|Sponsor: ||This research was sponsored by DGICYT (Dirección General de Investigaciones Científicas y Tecnológicas) of Spain under Project No. ENE2006-15244-C03-01/FTN. Research sponsored in part by the Laboratory Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. Research supported in part by DOE Office of Science Grant No. DEFG02-04ER5741 at the University of Alaska.|
|Publisher version: ||http://dx.doi.org/10.1063/1.3006088|
|Keywords: ||Plasma confinement|
|Rights: ||© American Institute of Physics|
|Appears in Collections:||DF - GFP - Artículos de revistas|
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