Threedimensional fluid simulations of tokamak edge turbulence
Abstract
Threedimensional (3D) simulations of driftresistive 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 (Lmode) 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 (Hmode) 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, Lmode, and Hmode transport are discussed. {copyright} {ital 1996 American Institute of Physics.}
 Authors:

 MaxPlanckInstitut fuer Plasmaphysik, EURATOM Association, 85748 Garching (Germany)
 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; HMODE PLASMA CONFINEMENT; SCALING LAWS; PLASMA SCRAPEOFF LAYER; DIVERTORS; CURVATURE
Citation Formats
Zeiler, A, Biskamp, D, Drake, J F, and Guzdar, P N. Threedimensional 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. Threedimensional 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 .
"Threedimensional fluid simulations of tokamak edge turbulence". United States. doi:10.1063/1.871630.
@article{osti_286346,
title = {Threedimensional fluid simulations of tokamak edge turbulence},
author = {Zeiler, A and Biskamp, D and Drake, J F and Guzdar, P N},
abstractNote = {Threedimensional (3D) simulations of driftresistive 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 (Lmode) 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 (Hmode) 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, Lmode, and Hmode 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}
}