Multi-species collisions for delta-f gyrokinetic simulations: Implementation and verification with GENE
Name
20ja038_full.pdf
Size
2.03 MB
Format
Adobe PDF
Checksum (MD5)
43034ffd3315618cff554d4e7ad3e7c5
Author(s)
Crandall, P.
Jarema, D.
Doerk, H.
Pan, Qingjiang
Merlo, G.
Görler, T.
Bañón Navarro, A.
Told, D.
Maurer, M., Jenko, F.
Date Issued
October 2020
Journal
Computer Physics Communications
Publisher
Elsevier
Abstract
A multi-species linearized collision operator based on the model developed by Sugama et al. has been implemented in the nonlinear gyrokinetic code, GENE. Such a model conserves particles, momentum, and energy to machine precision, and is shown to have negative definite free energy dissipation characteristics, satisfying Boltzmann’s H-theorem, including for realistic mass ratio. Finite Larmor Radius (FLR) effects have also been implemented into the local version of the code. For the global version of the code, the collision operator has been developed to allow for block-structured velocity space grids, allowing for computationally tractable collisional global simulations. The validity of the collision operator has been demonstrated by relaxation and conservation tests, as well as appropriate benchmarks. The newly implemented operator shall be used in future simulations to study magnetically confined fusion plasma turbulence and transport in more extreme regions with higher collisionality.
Description
Submitted for publication in Computer Physics Communications
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/j.cpc.2020.107360
