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

Dataset · Sun Jun 27 04:00:00 EDT 2021

DOI:https://doi.org/10.7910/DVN/OQ2BSJ· OSTI ID:1884726

Crandall, P. ^[1]; Jarema, D.; Doerk, H.; Pan, Q.; Merlo, G.; Görler, T.; Navarro, A. Bañón; Told, D.; Maurer, M.; Jenko, F.

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1. OSTI

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.

• Research Organization: Univ. of California, Los Angeles, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES)
• DOE Contract Number: SC0016073
• OSTI ID: 1884726
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
97 MATHEMATICS AND COMPUTING