Nonlinear Simulations of Peeling-Ballooning Modes with Anomalous Electron Viscosity and their Role in Edge Localized Mode Crashes

X. Q. Xu, B. Dudson, P. B. Snyder, M. V. Umansky, and H. Wilson
Phys. Rev. Lett. 105, 175005 – Published 22 October 2010

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. This is consistent with many observations of large ELMs.

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  • Received 25 May 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.175005

© 2010 The American Physical Society

Authors & Affiliations

X. Q. Xu1, B. Dudson2, P. B. Snyder3, M. V. Umansky1, and H. Wilson2

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550 USA
  • 2University of York, Heslington, York YO10 5DD, United Kingdom
  • 3General Atomics, San Diego, California 92186 USA

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Vol. 105, Iss. 17 — 22 October 2010

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