Multi-species collisions for delta-f gyrokinetic simulations: Implementation and verification with GENE

Crandall, P.; Jarema, D.; Doerk, H.; Pan, Q.; Merlo, G.; Görler, T.; Navarro, A. Bañón; Told, D.; Maurer, M.; Jenko, F.

doi:10.1016/j.cpc.2020.107360

Multi-species collisions for delta-f gyrokinetic simulations: Implementation and verification with GENE

Journal Article · Thu May 14 00:00:00 EDT 2020 · Computer Physics Communications

DOI:https://doi.org/10.1016/j.cpc.2020.107360· OSTI ID:1852090

^[1]; Jarema, D. ^[2]; Doerk, H. ^[2]; Pan, Q. ^[3]; Merlo, G. ^[4]; Görler, T. ^[2]; ^[2]; Told, D. ^[2]; Maurer, M. ^[2]; Jenko, F. ^[5]

Univ. of California, Los Angeles, CA (United States); Univ. of California, Los Angeles, CA (United States)
Max Planck Institute for Plasma Physics, Garching (Germany)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. of Texas, Austin, TX (United States)
Max Planck Institute for Plasma Physics, Garching (Germany); Univ. of Texas, Austin, TX (United States)

we report 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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: Euratom Research and Training Programme; USDOE Office of Science (SC)

Grant/Contract Number:: SC0016073

OSTI ID:: 1852090

Journal Information:: Computer Physics Communications, Journal Name: Computer Physics Communications Journal Issue: C Vol. 255; ISSN 0010-4655

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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