Nonlinear Simulations of Peeling-Ballooning Modes with Anomalous Electron Viscosity and their Role in Edge Localized Mode Crashes
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
- University of York, Heslington, York YO10 5DD (United Kingdom)
- General Atomics, San Diego, California 92186 (United States)
A minimum set of equations based on the peeling-ballooning (P-B) model with nonideal physics effects (diamagnetic drift, ExB 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.
- OSTI ID:
- 21467041
- Journal Information:
- Physical Review Letters, Vol. 105, Issue 17; Other Information: DOI: 10.1103/PhysRevLett.105.175005; (c) 2010 American Institute of Physics; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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B CODES
BALLOONING INSTABILITY
COMPUTERIZED SIMULATION
EDGE LOCALIZED MODES
ELECTROMAGNETIC FIELDS
ELECTRONS
MAGNETIC RECONNECTION
NONLINEAR PROBLEMS
PLASMA FLUID EQUATIONS
PLASMA SIMULATION
STORED ENERGY
THERMAL DIFFUSIVITY
VISCOSITY
BOLTZMANN-VLASOV EQUATION
COMPUTER CODES
DIFFERENTIAL EQUATIONS
ELEMENTARY PARTICLES
ENERGY
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FERMIONS
INSTABILITY
LEPTONS
PARTIAL DIFFERENTIAL EQUATIONS
PHYSICAL PROPERTIES
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
SIMULATION
THERMODYNAMIC PROPERTIES