Crossverification of neoclassical transport solutions from XGCa against NEO
Abstract
Radial neoclassical transport from the global gyrokinetic code XGC has been crossverified against the local driftkinetic neoclassical code NEO in NEO's local regime using a GradShafranov equilibrium with a circular boundary. XGC shows excellent agreement with NEO, except for a difference of approximately 10% in the ion heat flux. Close investigation reveals that this difference is due to the simplification in NEO to use the same Coulomb logarithm ln Λ to represent all particle species, while XGC uses different formulas for collisions between different species. When XGC uses NEO's Coulomb logarithm, excellent agreement in the ion heat flux is recovered. Here, the present work not only crossverifies the equation solvers in two codes, but also verifies that the gyrokinetic and the driftkinetic equations agree and that the linearized and nonlinear Coulomb collision operators agree in the mild gradient, local regime.
 Authors:

 Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
 Publication Date:
 Research Org.:
 Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1573464
 Alternate Identifier(s):
 OSTI ID: 1570494
 Grant/Contract Number:
 AC0209CH11466; FC0204ER54698; AC0206CH11357; AC0205CH11231
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physics of Plasmas
 Additional Journal Information:
 Journal Volume: 26; Journal Issue: 10; Journal ID: ISSN 1070664X
 Publisher:
 American Institute of Physics (AIP)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Hager, R., Dominski, J., and Chang, C. S. Crossverification of neoclassical transport solutions from XGCa against NEO. United States: N. p., 2019.
Web. doi:10.1063/1.5121308.
Hager, R., Dominski, J., & Chang, C. S. Crossverification of neoclassical transport solutions from XGCa against NEO. United States. doi:10.1063/1.5121308.
Hager, R., Dominski, J., and Chang, C. S. Tue .
"Crossverification of neoclassical transport solutions from XGCa against NEO". United States. doi:10.1063/1.5121308. https://www.osti.gov/servlets/purl/1573464.
@article{osti_1573464,
title = {Crossverification of neoclassical transport solutions from XGCa against NEO},
author = {Hager, R. and Dominski, J. and Chang, C. S.},
abstractNote = {Radial neoclassical transport from the global gyrokinetic code XGC has been crossverified against the local driftkinetic neoclassical code NEO in NEO's local regime using a GradShafranov equilibrium with a circular boundary. XGC shows excellent agreement with NEO, except for a difference of approximately 10% in the ion heat flux. Close investigation reveals that this difference is due to the simplification in NEO to use the same Coulomb logarithm ln Λ to represent all particle species, while XGC uses different formulas for collisions between different species. When XGC uses NEO's Coulomb logarithm, excellent agreement in the ion heat flux is recovered. Here, the present work not only crossverifies the equation solvers in two codes, but also verifies that the gyrokinetic and the driftkinetic equations agree and that the linearized and nonlinear Coulomb collision operators agree in the mild gradient, local regime.},
doi = {10.1063/1.5121308},
journal = {Physics of Plasmas},
number = 10,
volume = 26,
place = {United States},
year = {2019},
month = {10}
}
Web of Science
Figures / Tables:
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