Modeling neoclassical impurity transport with the full-f gyrokinetic code COGENT
POSTER
Abstract
In recent years, various collision operator models have been implemented in numerous gyrokinetic codes to simulate Coulomb collisions in tokamak plasmas [1–7]. Because of high computation cost, only some gyrokinetic codes [9,10] include the correct collision operator, typically referred to as the Fokker-Planck operator. Instead, recent reports [2–7] focus on implementing increasingly complex reduced collision operators and extending these operators for the case of unlike species. Proposed models differ in physical properties, and have different scopes of use. In particular, some recent implementations of unlike collisions (e.g., [9,10]) produce no thermal force, which is important for impurity transport in the tokamak edge [11,12].
The poster reviews multi-species linearized collision operator [13], based on the approach proposed by Kolesnikov [14], in the continuum full-f gyrokinetic code COGENT. The operator is based on the Landau operator and preserves the dependence of the Coulomb mean free path on a relative velocity of colliding species. This enables to recover Braginskii thermal force in the COGENT simulations of highly collisional plasmas.
We analyze simulation results with the Braginskii fluid model, show that COGENT recovers friction and thermal forces, and present study of the neoclassical impurities transport using the new collision operator.
This work was supported by the U.S. DoE under Award No. DE-SC0016548 at UCSD, and under Contract No. DE- AC52–07NA27344 at LLNL.
[1] H. Sugama et al., Phys. Plasmas 16 (2009) 112503.
[2] H. Sugama et al., Phys. Plasmas 26 (2019) 102108.
[3] P. Donnel et al., Comput. Phys. Commun. 234 (2019)
[4] P. Crandall et al., Comput. Phys. Commun. 255 (2020) 107360.
[5] M. Francisquez, et al., J. Plasma Phys. 88 (2022) 905880303.
[6] P. Ulbl et al., Contrib. Plasma Phys. 62 (2022) e202100180.
[7] B. Frei et al., Phys. Plasmas 29 (2022) 093902.
[8] L. Landau, Phys. Z. Sowjetunion 10 (1936) 154–164.
[9] R. Hager et al., J. Comput. Phys. 315 (2016) 644.
[10] M. Dorf et al., Contrib. Plasma Phys. 54 (2014) 517.
[11] P.C. Stangeby, CFFTP-G–9042, 1990.
[12] S. Yamoto et al., Comput. Phys. Commun. 248 (2020) 106979.
[13] A. R. Knyazev et al., Comput. Phys. Commun. (2023): 108829.
[14] R. Kolesnikov, et al. J. Comput. Phys. 229 (2010) 5564.
[15] S. Braginskii, Consultants Bureau, New York, 1965.
The poster reviews multi-species linearized collision operator [13], based on the approach proposed by Kolesnikov [14], in the continuum full-f gyrokinetic code COGENT. The operator is based on the Landau operator and preserves the dependence of the Coulomb mean free path on a relative velocity of colliding species. This enables to recover Braginskii thermal force in the COGENT simulations of highly collisional plasmas.
We analyze simulation results with the Braginskii fluid model, show that COGENT recovers friction and thermal forces, and present study of the neoclassical impurities transport using the new collision operator.
This work was supported by the U.S. DoE under Award No. DE-SC0016548 at UCSD, and under Contract No. DE- AC52–07NA27344 at LLNL.
[1] H. Sugama et al., Phys. Plasmas 16 (2009) 112503.
[2] H. Sugama et al., Phys. Plasmas 26 (2019) 102108.
[3] P. Donnel et al., Comput. Phys. Commun. 234 (2019)
[4] P. Crandall et al., Comput. Phys. Commun. 255 (2020) 107360.
[5] M. Francisquez, et al., J. Plasma Phys. 88 (2022) 905880303.
[6] P. Ulbl et al., Contrib. Plasma Phys. 62 (2022) e202100180.
[7] B. Frei et al., Phys. Plasmas 29 (2022) 093902.
[8] L. Landau, Phys. Z. Sowjetunion 10 (1936) 154–164.
[9] R. Hager et al., J. Comput. Phys. 315 (2016) 644.
[10] M. Dorf et al., Contrib. Plasma Phys. 54 (2014) 517.
[11] P.C. Stangeby, CFFTP-G–9042, 1990.
[12] S. Yamoto et al., Comput. Phys. Commun. 248 (2020) 106979.
[13] A. R. Knyazev et al., Comput. Phys. Commun. (2023): 108829.
[14] R. Kolesnikov, et al. J. Comput. Phys. 229 (2010) 5564.
[15] S. Braginskii, Consultants Bureau, New York, 1965.
Publication: Knyazev, A. R., M. Dorf, and S. I. Krasheninnikov. "Implementation and verification of a model linearized multi-species collision operator in the COGENT code." Computer Physics Communications (2023): 108829.
Presenters
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Alexey R Knyazev
University of California, San Diego
Authors
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Alexey R Knyazev
University of California, San Diego
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Mikhail Dorf
Lawrence Livermore National Laboratory
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Sergei I Krasheninnikov
University of California, San Diego