IAEA Fusion Energy Conference 2010Proceedings of the 23rd IAEA Fusion Energy ConferenceDaejeon, 11-16 October 2010 Organized by the
International Atomic Energy Agency IAEA-CN-180 (THC/P4-24) Gyrokinetic Studies of Turbulence, Equilibrium, and Flows in the Tokamak EdgeB.D. Scott1), F. Da Silva2), A. Kendl3), N. Miyato4), T. Ribeiro1)2)1) Max Planck Institut für Plasmaphysik, Euratom Association, Garching, Germany 2) Instituto de Plasmas e Fusão Nuclear, Euratom, Lisbon, Portugal 3) Institut für theoretische Physik, Euratom/OeAW, University of Innsbruck, Innsbruck, Austria 4) Japan Atomic Energy Agency, Naka, Ibaraki, Japan
Abstract. We report on developments in the theory and computation of
gyrokinetic turbulence in the tokamak edge. A new formulation of the
gyrokinetic Lagrangian for the strong E×B-flow
regime is been found,
with clear correspondence to previous forms and to reduced
MHD. Conservation of energy, momentum, entropy, and particles is
demonstrated at both theoretical and computational level. Neoclassical
phenomena and MHD equilibration are shown in our electromagnetic
total-f phase-space computational model FEFI. Delta-f gyrokinetic edge
turbulence is computed on the full flux surface with the local fluxtube
model delta-FEFI and results on the edge/core transition are given. We
also present ongoing gyrofluid studies of ELM crash scenarios,
including the influence of the bootstrap current in an edge pedestal
model on both the initial instability and the resulting
turbulence. These studies and findings are centrally relevant to
further understanding of the H-mode and pressure profile pedestal in
large tokamaks.
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