Progress with the COGENT Edge Kinetic Code: Implementing the Fokker-Plank Collision Operator

Journal Article · Fri Jun 20 00:00:00 EDT 2014 · Contributions to Plasma Physics

DOI:https://doi.org/10.1002/ctpp.201410023· OSTI ID:1248299

Dorf, M. A. ^[1]; Cohen, R. H. ^[1]; Dorr, M. ^[1]; Hittinger, J. ^[1]; Rognlien, T. D. ^[1]

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1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Here, COGENT is a continuum gyrokinetic code for edge plasma simulations being developed by the Edge Simulation Laboratory collaboration. The code is distinguished by application of a fourth-order finite-volume (conservative) discretization, and mapped multiblock grid technology to handle the geometric complexity of the tokamak edge. The distribution function F is discretized in v∥ – μ (parallel velocity – magnetic moment) velocity coordinates, and the code presently solves an axisymmetric full-f gyro-kinetic equation coupled to the long-wavelength limit of the gyro-Poisson equation. COGENT capabilities are extended by implementing the fully nonlinear Fokker-Plank operator to model Coulomb collisions in magnetized edge plasmas. The corresponding Rosenbluth potentials are computed by making use of a finite-difference scheme and multipole-expansion boundary conditions. Details of the numerical algorithms and results of the initial verification studies are discussed. (© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-07NA27344
• OSTI ID: 1248299
• Report Number(s): LLNL-JRNL-643953
• Journal Information: Contributions to Plasma Physics, Vol. 54, Issue 4-6; ISSN 0863-1042
• Publisher: Wiley
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
97 MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
edge
plasma
simulation
kinetic
gyrokinetic