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

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [2]
  1. Univ. of Alaska, Fairbanks, AK (United States). Dept. of Physics
  2. Univ. Carlos III, Madrid (Spain). Departamento de Física
Publication Date:
Research Org.:
Univ. of Alaska, Fairbanks, AK (United States). Dept. of Physics
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1361872
Alternate Identifier(s):
OSTI ID: 1421173; OSTI ID: 1465765
Grant/Contract Number:  
FG02-04ER54741
Resource Type:
Journal Article: Published Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Ogata, D., Newman, D. E., and Sánchez, R. Investigation of the interaction between competing types of nondiffusive transport in drift wave turbulence. United States: N. p., 2017. Web. doi:10.1063/1.4983053.
Ogata, D., Newman, D. E., & Sánchez, R. Investigation of the interaction between competing types of nondiffusive transport in drift wave turbulence. United States. doi:10.1063/1.4983053.
Ogata, D., Newman, D. E., and Sánchez, R. Mon . "Investigation of the interaction between competing types of nondiffusive transport in drift wave turbulence". United States. doi:10.1063/1.4983053.
@article{osti_1361872,
title = {Investigation of the interaction between competing types of nondiffusive transport in drift wave turbulence},
author = {Ogata, D. and Newman, D. E. and Sánchez, R.},
abstractNote = {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.},
doi = {10.1063/1.4983053},
journal = {Physics of Plasmas},
number = 5,
volume = 24,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1063/1.4983053

Citation Metrics:
Cited by: 2 works
Citation information provided by
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