SMuK 2021 – scientific programme
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P: Fachverband Plasmaphysik
P 5: Poster I
P 5.38: Poster
Tuesday, August 31, 2021, 14:00–16:00, P
Collisional Relaxation of an Anisotropic Two-Species System as a Verification of a Simplified Fokker-Planck-Type Collision Operator — •Philipp Ulbl1, Dominik Michels1, and Frank Jenko1,2 — 1Max Planck Institute for Plasma Physics, Boltzmannstraße 2, 85748 Garching, Germany — 2University of Texas at Austin, Austin, TX 78712, USA
Collisions have significant effects on the properties of edge and scrape-off-layer turbulence in magnetic confinement fusion devices. State of the art simulations of plasma turbulence are built on the gyrokinetic equations and require the addition of a so-called collision operator. The typical choice in a plasma, a Fokker-Planck collision operator does yield physically accurate results but also heavily impacts the computational performance of numerical codes. Therefore, it can be beneficial to use simplified Fokker-Planck-type collision operators that capture most of the physics and are faster to calculate. In this work, we present the Lenard-Bernstein/Dougherty (LBD) collision operator [1, 2] that has been implemented in the gyrokinetic turbulence code GENE-X [3]. We show a verification of the physics based on the collisional relaxation of an anisotropic electron-deuterium system. Further, we compare the results with analytical estimations and with results from a Bhatnagar-Gross-Krook (BGK) collision operator [4].
[1] A. Lenard, and I. B. Bernstein, Phys. Rev. 112, 1456 (1958)
[2] J. P. Dougherty, Phys. Fluids 7, 1788 (1964)
[3] D. Michels, et. al., Comput. Phys. Commun. 264, 107986 (2021)
[4] P. L. Bhatnagar, et. al., Phys. Rev. 94, 511 (1954)