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Title: Effects of the magnetic equilibrium on gyrokinetic simulations of tokamak microinstabilities

The general geometry of the experimental tokamak magnetic equilibrium is implemented in the global gyrokinetic simulation code GEM. Compared to the general geometry, the well used Miller parameterization of the magnetic equilibrium is a good approximation in the core region and up to the top of the pedestal. Linear simulations indicate that results with the two geometries agree for r/a ≤ 0.9. However, in the edge region, the instabilities are sensitive to the magnetic equilibrium in both the L-mode and the H-mode plasmas. A small variation of the plasma shaping parameters leads to large changes to the edge instability.
Authors:
; ;  [1] ;  [2]
  1. Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States)
  2. General Atomics, Post Office Box 85068, San Diego, California 92186 (United States)
Publication Date:
OSTI Identifier:
22410437
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; EQUILIBRIUM; GEOMETRY; H-MODE PLASMA CONFINEMENT; L-MODE PLASMA CONFINEMENT; MAGNETIC FIELD CONFIGURATIONS; PLASMA INSTABILITY; PLASMA MICROINSTABILITIES; SIMULATION; TOKAMAK DEVICES