Implicit full-F simulations of neoclassical ion transport

Dorf, Mikhail; Dorr, Milo; Ghosh, Debojyoti; Umansky, Maxim; Soukhanovskii, Vlad

doi:10.1063/5.0280028

Implicit full-F simulations of neoclassical ion transport

Journal Article · Mon Aug 25 00:00:00 EDT 2025 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0280028· OSTI ID:2588989

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Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

The development of implicit time integration capabilities for axisymmetric full-F continuum simulations of ion neoclassical transport is reported. The approach involves the implicit treatment of the gyrokinetic Vlasov equation coupled to the nonlinear Fokker–Planck collision model in the long-wavelength limit approximation. To facilitate implicit simulations, advanced preconditioning of individual physics operators is developed, and a global multi-physics preconditioner is constructed by adopting an operator splitting methodology. The algorithm is implemented in the finite-volume code COGENT and is applied to study neoclassical transport properties for both the main ion species and the lithium impurity species in the closed-field-line region of the LTX- β tokamak. The implicit COGENT simulations elucidate the role of non-local transport effects, while demonstrating substantial speedup over the corresponding explicit approach.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2588989

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 32; ISSN 1070-664X; ISSN 1089-7674

Publisher:: AIP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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