skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Equilibrium Flows in Non-linear MHD Simulations of X-point Plasmas

Abstract

In non-linear MHD simulations of ELMs, a radially localised, toroidally symmetric, poloidal flow layer exists in the H-mode pedestal region. This sheared flow layer could have a significant influence on the linear stability properties of MHD instabilities and their non-linear evolution. Using the non-linear MHD simulation code JOREK with reduced resistive MHD equations, we study the edge-localised poloidal flow in both circular and X-point tokamak plasmas at equilibrium (toroidal symmetry). For the circular case, an analytical interpretation is derived. In the simulations of X-point plasmas, the flow can have both m = 0 and m = 1 components. In fact, abrupt transitions take place between the two equilibrium states, accompanied by a strong increase in the kinetic energy. Similar transitions between equilibrium flow states have been predicted by Strauss for m = 0 poloidal flow patterns. Scalings are obtained for both the m = 1 and m = 0 flows.

Authors:
;  [1]
  1. Association Euratom-CEA, CEA/DSM/IRFM/SCCP/GTTM, Centre de Cadarache, 13108 Saint-Paul-Lez-Durance (France)
Publication Date:
OSTI Identifier:
21251754
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1069; Journal Issue: 1; Conference: Joint Varenna-Lausanne international workshop on theory of fusion plasmas, Varenna (Italy), 25-29 Aug 2008; Other Information: DOI: 10.1063/1.3033721; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; EDGE LOCALIZED MODES; EQUATIONS; EQUILIBRIUM; EVOLUTION; H-MODE PLASMA CONFINEMENT; KINETIC ENERGY; LAYERS; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; PLASMA; PLASMA SIMULATION; SYMMETRY; TOKAMAK DEVICES

Citation Formats

Pamela, S, and Huysmans, G T. A. Equilibrium Flows in Non-linear MHD Simulations of X-point Plasmas. United States: N. p., 2008. Web. doi:10.1063/1.3033721.
Pamela, S, & Huysmans, G T. A. Equilibrium Flows in Non-linear MHD Simulations of X-point Plasmas. United States. https://doi.org/10.1063/1.3033721
Pamela, S, and Huysmans, G T. A. 2008. "Equilibrium Flows in Non-linear MHD Simulations of X-point Plasmas". United States. https://doi.org/10.1063/1.3033721.
@article{osti_21251754,
title = {Equilibrium Flows in Non-linear MHD Simulations of X-point Plasmas},
author = {Pamela, S and Huysmans, G T. A.},
abstractNote = {In non-linear MHD simulations of ELMs, a radially localised, toroidally symmetric, poloidal flow layer exists in the H-mode pedestal region. This sheared flow layer could have a significant influence on the linear stability properties of MHD instabilities and their non-linear evolution. Using the non-linear MHD simulation code JOREK with reduced resistive MHD equations, we study the edge-localised poloidal flow in both circular and X-point tokamak plasmas at equilibrium (toroidal symmetry). For the circular case, an analytical interpretation is derived. In the simulations of X-point plasmas, the flow can have both m = 0 and m = 1 components. In fact, abrupt transitions take place between the two equilibrium states, accompanied by a strong increase in the kinetic energy. Similar transitions between equilibrium flow states have been predicted by Strauss for m = 0 poloidal flow patterns. Scalings are obtained for both the m = 1 and m = 0 flows.},
doi = {10.1063/1.3033721},
url = {https://www.osti.gov/biblio/21251754}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1069,
place = {United States},
year = {Sat Nov 01 00:00:00 EDT 2008},
month = {Sat Nov 01 00:00:00 EDT 2008}
}