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

Abstract

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.

Authors:
ORCiD logo [1];  [2];  [2];  [3];  [4];  [2]; ORCiD logo [2];  [2];  [2];  [5]
+ Show Author Affiliations
  1. Univ. of California, Los Angeles, CA (United States)
  2. Max Planck Institute for Plasma Physics, Garching (Germany)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Univ. of Texas, Austin, TX (United States)
  5. Max Planck Institute for Plasma Physics, Garching (Germany); Univ. of Texas, Austin, TX (United States)
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Euratom Research and Training Programme
OSTI Identifier:
1852090
Grant/Contract Number:  
SC0016073; 633053
Resource Type:
Accepted Manuscript
Journal Name:
Computer Physics Communications
Additional Journal Information:
Journal Volume: 255; Journal Issue: C; Journal ID: ISSN 0010-4655
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; gyrokinetics; collisions; GENE

Citation Formats

Crandall, P., Jarema, D., Doerk, H., Pan, Q., Merlo, G., Görler, T., Navarro, A. Bañón, Told, D., Maurer, M., and Jenko, F. Multi-species collisions for delta-f gyrokinetic simulations: Implementation and verification with GENE. United States: N. p., 2020. Web. doi:10.1016/j.cpc.2020.107360.
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Crandall, P., Jarema, D., Doerk, H., Pan, Q., Merlo, G., Görler, T., Navarro, A. Bañón, Told, D., Maurer, M., & Jenko, F. Multi-species collisions for delta-f gyrokinetic simulations: Implementation and verification with GENE. United States. https://doi.org/10.1016/j.cpc.2020.107360
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Crandall, P., Jarema, D., Doerk, H., Pan, Q., Merlo, G., Görler, T., Navarro, A. Bañón, Told, D., Maurer, M., and Jenko, F. Thu . "Multi-species collisions for delta-f gyrokinetic simulations: Implementation and verification with GENE". United States. https://doi.org/10.1016/j.cpc.2020.107360. https://www.osti.gov/servlets/purl/1852090.
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@article{osti_1852090,
title = {Multi-species collisions for delta-f gyrokinetic simulations: Implementation and verification with GENE},
author = {Crandall, P. and Jarema, D. and Doerk, H. and Pan, Q. and Merlo, G. and Görler, T. and Navarro, A. Bañón and Told, D. and Maurer, M. and Jenko, F.},
abstractNote = {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.},
doi = {10.1016/j.cpc.2020.107360},
journal = {Computer Physics Communications},
number = C,
volume = 255,
place = {United States},
year = {Thu May 14 00:00:00 EDT 2020},
month = {Thu May 14 00:00:00 EDT 2020}
}
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https://doi.org/10.1016/j.cpc.2020.107360
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