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LOCATION:HG F 26.3
DTSTART;TZID=Europe/Stockholm:20240604T163000
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UID:submissions.pasc-conference.org_PASC24_sess117_msa125@linklings.com
SUMMARY:A Semi-Implicit Gyrokinetc Ion – Fluid Electron Hybrid Model for E
 dge Plasma Simulations
DESCRIPTION:Minisymposium\n\nMikhail Dorf, Milo Dorr, and Debojyoti Ghosh 
 (Lawrence Livermore National Laboratory)\n\nWe report progress on the deve
 lopment and application of a hybrid gyrokinetic ion–fluid electron model f
 or simulations of cross-separatrix plasma transport in the edge region of 
 a divertor tokamak. The hybrid model includes ion-scale ion temperature gr
 adient (ITG) and resistive drift and ballooning modes, as well as neoclass
 ical ion physics and orbit loss effects. The model is implemented in the f
 inite-volume gyrokinetic code COGENT, which employs a locally field-aligne
 d coordinate system combined with mapped multi-block grid technology to ha
 ndle strongly anisotropic edge plasma turbulence. Additionally, COGENT uti
 lizes a flexible implicit-explicit (IMEX) time integration framework that 
 can handle the temporal multiscale nature of plasma transport. To that end
 , the 5D high-dimensional kinetic part of the system that involves ion par
 allel transients and diamagnetic drift time scales is treated explicitly. 
 The 3D low-dimensional fluid part of the system that contains fast electro
 n physics and Alfven-wave time scales is treated implicitly. The performan
 ce of the IMEX scheme is optimized by developing specialized preconditione
 rs for the electrostatic and electromagnetic versions of the hybrid model.
  Verification results and simulations in realistic single-null geometries 
 are presented.\n\n*Work performed for USDOE, at LLNL under contract DE-AC5
 2-07NA27344.\n\nDomain: Physics, Computational Methods and Applied Mathema
 tics\n\nSession Chairs: Stephan Brunner (EPFL); Eric Sonnendrücker (Max Pl
 anck Institute for Plasma Physics, Technical University of Munich); and La
 urent Villard (EPFL)
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