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Title: Three-dimensional fluid simulations of tokamak edge turbulence

Abstract

Three-dimensional (3-D) simulations of drift-resistive ballooning turbulence are presented. The turbulence is basically controlled by a parameter {alpha}, the ratio of the drift wave frequency to the ideal ballooning growth rate. If this parameter is small [{alpha}{le}1, corresponding to Ohmic (OH) or low confinement phase (L-mode) plasmas], the system is dominated by ballooning turbulence, which is strongly peaked at the outside of the torus. If it is large [{alpha}{ge}1, corresponding to high confinement phase (H-mode) plasmas], field line curvature plays a minor role. The turbulence is nonlinearly sustained even if curvature is removed and all modes are linearly stable due to magnetic shear. In the nonlinear regime without curvature the system obeys a different scaling law compared to the low-{alpha} regime. The transport scaling is discussed in both regimes and the implications for OH, L-mode, and H-mode transport are discussed. {copyright} {ital 1996 American Institute of Physics.}

Authors:
;  [1]; ;  [2]
  1. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, 85748 Garching (Germany)
  2. Institute for Plasma Research, University of Maryland, College Park, Maryland 20742 (United States)
Publication Date:
OSTI Identifier:
286346
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 3; Journal Issue: 8; Other Information: PBD: Aug 1996
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; TOKAMAK DEVICES; TURBULENCE; PLASMA SIMULATION; DRIFT INSTABILITY; BALLOONING INSTABILITY; H-MODE PLASMA CONFINEMENT; SCALING LAWS; PLASMA SCRAPE-OFF LAYER; DIVERTORS; CURVATURE

Citation Formats

Zeiler, A, Biskamp, D, Drake, J F, and Guzdar, P N. Three-dimensional fluid simulations of tokamak edge turbulence. United States: N. p., 1996. Web. doi:10.1063/1.871630.
Zeiler, A, Biskamp, D, Drake, J F, & Guzdar, P N. Three-dimensional fluid simulations of tokamak edge turbulence. United States. doi:10.1063/1.871630.
Zeiler, A, Biskamp, D, Drake, J F, and Guzdar, P N. Thu . "Three-dimensional fluid simulations of tokamak edge turbulence". United States. doi:10.1063/1.871630.
@article{osti_286346,
title = {Three-dimensional fluid simulations of tokamak edge turbulence},
author = {Zeiler, A and Biskamp, D and Drake, J F and Guzdar, P N},
abstractNote = {Three-dimensional (3-D) simulations of drift-resistive ballooning turbulence are presented. The turbulence is basically controlled by a parameter {alpha}, the ratio of the drift wave frequency to the ideal ballooning growth rate. If this parameter is small [{alpha}{le}1, corresponding to Ohmic (OH) or low confinement phase (L-mode) plasmas], the system is dominated by ballooning turbulence, which is strongly peaked at the outside of the torus. If it is large [{alpha}{ge}1, corresponding to high confinement phase (H-mode) plasmas], field line curvature plays a minor role. The turbulence is nonlinearly sustained even if curvature is removed and all modes are linearly stable due to magnetic shear. In the nonlinear regime without curvature the system obeys a different scaling law compared to the low-{alpha} regime. The transport scaling is discussed in both regimes and the implications for OH, L-mode, and H-mode transport are discussed. {copyright} {ital 1996 American Institute of Physics.}},
doi = {10.1063/1.871630},
journal = {Physics of Plasmas},
number = 8,
volume = 3,
place = {United States},
year = {1996},
month = {8}
}