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Title: Study of the L-mode tokamak plasma “shortfall” with local and global nonlinear gyrokinetic δf particle-in-cell simulation

The δ f particle-in-cell code GEM is used to study the transport “shortfall” problem of gyrokinetic simulations. In local simulations, the GEM results confirm the previously reported simulation results of DIII-D [Holland et al., Phys. Plasmas 16, 052301 (2009)] and Alcator C-Mod [Howard et al., Nucl. Fusion 53, 123011 (2013)] tokamaks with the continuum code GYRO. Namely, for DIII-D the simulations closely predict the ion heat flux at the core, while substantially underpredict transport towards the edge; while for Alcator C-Mod, the simulations show agreement with the experimental values of ion heat flux, at least within the range of experimental error. Global simulations are carried out for DIII-D L-mode plasmas to study the effect of edge turbulence on the outer core ion heat transport. The edge turbulence enhances the outer core ion heat transport through turbulence spreading. However, this edge turbulence spreading effect is not enough to explain the transport underprediction.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4]
  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)
  3. University of California at San Diego, La Jolla, California 92093 (United States)
  4. Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, Tennessee 37831 (United States)
Publication Date:
OSTI Identifier:
22403265
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 11; Other Information: (c) 2014 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; ALCATOR DEVICE; DOUBLET-3 DEVICE; HEAT FLUX; HEAT TRANSFER; IONS; L-MODE PLASMA CONFINEMENT; PARTICLES; PLASMA; SIMULATION; TURBULENCE