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Progress with the COGENT Edge Kinetic Code: Collision Operator Options
Author(s) -
Dorf M. A.,
Cohen R. H.,
Compton J. C.,
Dorr M.,
Rognlien T. D.,
Angus J.,
Krasheninnikov S.,
Colella P.,
Martin D.,
McCorquodale P.
Publication year - 2012
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201210042
Subject(s) - discretization , physics , operator (biology) , poisson's equation , collision , drag , coulomb collision , classical mechanics , kinetic energy , code (set theory) , statistical physics , computer science , mechanics , mathematical analysis , electron , quantum mechanics , inelastic collision , mathematics , biochemistry , chemistry , computer security , repressor , transcription factor , gene , set (abstract data type) , programming language
COGENT is a continuum gyrokinetic code for edge plasmas being developed by the Edge Simulation Laboratory collaboration. The code is distinguished by application of the fourth order conservative discretization, and mapped multiblock grid technology to handle the geometric complexity of the tokamak edge. It is written in v ‖ ‐ μ (parallel velocity – magnetic moment) velocity coordinates, and making use of the gyrokinetic Poisson equation for the calculation of a self‐consistent electric potential. In the present manuscript we report on the implementation and initial testing of a succession of increasingly detailed collision operator options, including a simple drag‐diffusion operator in the parallel velocity space, Lorentz collisions, and a linearized model Fokker‐Planck collision operator conserving momentum and energy (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)