Cross-verification of neoclassical transport solutions from XGCa against NEO

Hager, R.; Dominski, J.; Chang, C. S.

doi:10.1063/1.5121308

Title: Cross-verification of neoclassical transport solutions from XGCa against NEO

Journal Article · 15 October 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5121308 · OSTI ID:1573464

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Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Radial neoclassical transport from the global gyrokinetic code XGC has been cross-verified against the local drift-kinetic neoclassical code NEO in NEO's local regime using a Grad-Shafranov 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 drift-kinetic equations agree and that the linearized and nonlinear Coulomb collision operators agree in the mild gradient, local regime.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; AC02-06CH11357; AC02-05CH11231

OSTI ID:: 1573464

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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