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Title: Shear flows at the tokamak edge and their interaction with edge-localized modes

Abstract

Shear flows in the scrape-off layer (SOL) and the edge pedestal region of tokamaks are shown to arise naturally out of transport processes in a magnetohydrodynamic model. In quasi-steady-state conditions, collisional resistivity coupled with a simple bootstrap current model necessarily leads to poloidal and toroidal flows, mainly localized to the edge and SOL. The role of these flows in the grad-B drift direction dependence of the power threshold for the L (low) to H (high) transition, and their effect on core rotation, are discussed. Theoretical predictions based on symmetries of the underlying equations, coupled with computational results, are found to be in agreement with observations in Alcator C-Mod [Phys. Plasmas 12, 056111 (2005)]. The effects of these self-consistent flows on linear peeling/ballooning modes and their nonlinear consequences are also examined.

Authors:
 [1]
  1. Institute for Fusion Studies, University of Texas at Austin, Austin, Texas 78712 (United States)
Publication Date:
OSTI Identifier:
20975056
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 5; Other Information: DOI: 10.1063/1.2727330; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALCATOR DEVICE; BALLOONING INSTABILITY; BOOTSTRAP CURRENT; EDGE LOCALIZED MODES; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; PLASMA; PLASMA CONFINEMENT; PLASMA SCRAPE-OFF LAYER; ROTATION; SHEAR; STEADY-STATE CONDITIONS

Citation Formats

Aydemir, A. Y. Shear flows at the tokamak edge and their interaction with edge-localized modes. United States: N. p., 2007. Web. doi:10.1063/1.2727330.
Aydemir, A. Y. Shear flows at the tokamak edge and their interaction with edge-localized modes. United States. doi:10.1063/1.2727330.
Aydemir, A. Y. Tue . "Shear flows at the tokamak edge and their interaction with edge-localized modes". United States. doi:10.1063/1.2727330.
@article{osti_20975056,
title = {Shear flows at the tokamak edge and their interaction with edge-localized modes},
author = {Aydemir, A. Y.},
abstractNote = {Shear flows in the scrape-off layer (SOL) and the edge pedestal region of tokamaks are shown to arise naturally out of transport processes in a magnetohydrodynamic model. In quasi-steady-state conditions, collisional resistivity coupled with a simple bootstrap current model necessarily leads to poloidal and toroidal flows, mainly localized to the edge and SOL. The role of these flows in the grad-B drift direction dependence of the power threshold for the L (low) to H (high) transition, and their effect on core rotation, are discussed. Theoretical predictions based on symmetries of the underlying equations, coupled with computational results, are found to be in agreement with observations in Alcator C-Mod [Phys. Plasmas 12, 056111 (2005)]. The effects of these self-consistent flows on linear peeling/ballooning modes and their nonlinear consequences are also examined.},
doi = {10.1063/1.2727330},
journal = {Physics of Plasmas},
number = 5,
volume = 14,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}