Five-field simulations of peeling-ballooning modes using BOUT++ code
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei (China)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
The simulations of edge localized modes (ELMs) with a 5-field peeling-ballooning (P-B) model using BOUT++ code are reported in this paper. In order to study the particle and energy transport in the pedestal region, the pressure equation is separated into ion density and ion and electron temperature equations. Through the simulations, the length scale L{sub n} of the gradient of equilibrium density n{sub i0} is found to destabilize the P-B modes in ideal MHD model. With ion diamagnetic effects, the growth rate is inversely proportional to n{sub i0} at medium toroidal mode number n. For the nonlinear simulations, the gradient of n{sub i0} in the pedestal region can more than double the ELM size. This increasing effect can be suppressed by thermal diffusivities χ{sub ∥}, employing the flux limited expression. Thermal diffusivities are sufficient to suppress the perturbations at the top of pedestal region. These suppressing effects lead to smaller ELM size of P-B modes.
- OSTI ID:
- 22218590
- Journal Information:
- Physics of Plasmas, Vol. 20, Issue 5; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
B CODES
BALLOONING INSTABILITY
CHARGED-PARTICLE TRANSPORT
COMPUTERIZED SIMULATION
DISTURBANCES
EDGE LOCALIZED MODES
ELECTRON TEMPERATURE
ION TEMPERATURE
MAGNETOHYDRODYNAMICS
NONLINEAR PROBLEMS
PLASMA DENSITY
PLASMA SIMULATION
THERMAL DIFFUSIVITY
THERMODYNAMICS