Investigation of the interaction between competing types of nondiffusive transport in drift wave turbulence

Ogata, D.; Newman, D. E.; Sánchez, R.

doi:10.1063/1.4983053

Title: Investigation of the interaction between competing types of nondiffusive transport in drift wave turbulence

Journal Article · Tue May 09 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4983053· OSTI ID:1361872

^[1]; Newman, D. E. ^[1]; Sánchez, R. ^[2]

Department of Physics, University of Alaska, Fairbanks, Alaska 99775-5920, USA
Departamento de Física, Universidad Carlos III, Leganés 28911, Madrid, Spain

Radial transport in turbulence dominated tokamak plasmas has been observed to deviate from classical diffusion in certain regimes relevant for magnetic confinement fusion. These situations at least include near-marginal turbulence, where radial transport becomes superdiffusive and mediated by elongated radial structures (or avalanches) and transport across radially sheared poloidal flows, where radial subdiffusion often ensues. In this paper, the interaction between very different physical ingredients responsible for these two types of nondiffusive dynamics (namely, turbulent profile relaxation close to a local threshold and the interaction with radially sheared zonal flows) is studied in detail in the context of a simple two-dimensional electrostatic plasma fluid turbulence model based on the dissipative trapped electron mode. It is shown that, depending on the relative relevance of each of these ingredients, which can be tuned in various ways, a variety of non-diffusive radial transport behaviors can be found in the system. The results also illustrate the fact that the classical diffusion paradigm is often insufficient to describe turbulent transport in systems with self-generated flows and turbulent profile relaxations.

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Research Organization:: Univ. of Alaska, Fairbanks, AK (United States). Dept. of Physics

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-04ER54741

OSTI ID:: 1361872

Alternate ID(s):: OSTI ID: 1421173; OSTI ID: 1465765

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Vol. 24 Journal Issue: 5; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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