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Title: Nonlinear simulations of peeling-ballooning modes with anomalous electron viscosity and their role in edge localized mode crashes

Abstract

A minimum set of equations based on the peeling-ballooning (P-B) model with nonideal physics effects (diamagnetic drift, E×B drift, resistivity, and anomalous electron viscosity) is found to simulate pedestal collapse when using the new BOUT++ simulation code, developed in part from the original fluid edge code BOUT. Nonlinear simulations of P-B modes demonstrate that the P-B modes trigger magnetic reconnection, which leads to the pedestal collapse. With the addition of a model of the anomalous electron viscosity under the assumption that the electron viscosity is comparable to the anomalous electron thermal diffusivity, it is found from simulations using a realistic high-Lundquist number that the pedestal collapse is limited to the edge region and the edge localized mode (ELM) size is about 5–10% of the pedestal stored energy. Furthermore, this is consistent with many observations of large ELMs.

Authors:
 [1];  [2];  [3];  [1];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of York, York (United Kingdom)
  3. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1238237
Report Number(s):
LLNL-JRNL-426985
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1600619
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 105; Journal Issue: 17; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION

Citation Formats

Xu, X. Q., Dudson, B., Snyder, P. B., Umansky, M. V., and Wilson, H. Nonlinear simulations of peeling-ballooning modes with anomalous electron viscosity and their role in edge localized mode crashes. United States: N. p., 2010. Web. doi:10.1103/PhysRevLett.105.175005.
Xu, X. Q., Dudson, B., Snyder, P. B., Umansky, M. V., & Wilson, H. Nonlinear simulations of peeling-ballooning modes with anomalous electron viscosity and their role in edge localized mode crashes. United States. doi:10.1103/PhysRevLett.105.175005.
Xu, X. Q., Dudson, B., Snyder, P. B., Umansky, M. V., and Wilson, H. Fri . "Nonlinear simulations of peeling-ballooning modes with anomalous electron viscosity and their role in edge localized mode crashes". United States. doi:10.1103/PhysRevLett.105.175005. https://www.osti.gov/servlets/purl/1238237.
@article{osti_1238237,
title = {Nonlinear simulations of peeling-ballooning modes with anomalous electron viscosity and their role in edge localized mode crashes},
author = {Xu, X. Q. and Dudson, B. and Snyder, P. B. and Umansky, M. V. and Wilson, H.},
abstractNote = {A minimum set of equations based on the peeling-ballooning (P-B) model with nonideal physics effects (diamagnetic drift, E×B drift, resistivity, and anomalous electron viscosity) is found to simulate pedestal collapse when using the new BOUT++ simulation code, developed in part from the original fluid edge code BOUT. Nonlinear simulations of P-B modes demonstrate that the P-B modes trigger magnetic reconnection, which leads to the pedestal collapse. With the addition of a model of the anomalous electron viscosity under the assumption that the electron viscosity is comparable to the anomalous electron thermal diffusivity, it is found from simulations using a realistic high-Lundquist number that the pedestal collapse is limited to the edge region and the edge localized mode (ELM) size is about 5–10% of the pedestal stored energy. Furthermore, this is consistent with many observations of large ELMs.},
doi = {10.1103/PhysRevLett.105.175005},
journal = {Physical Review Letters},
number = 17,
volume = 105,
place = {United States},
year = {2010},
month = {10}
}

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