10.46298/ops.14641http://ops.episciences.org/14641Fable, E.E.FableMax-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany0000-0001-5019-9685Tardini, G.G.TardiniMax-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany0009-0002-0544-6880Giannone, L.L.GiannoneMax-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany0000-0001-5611-200XTeam, the ASDEX Upgradethe ASDEX UpgradeTeamFEQIS: A free-boundary equilibrium solver for integrated modeling of tokamak plasmasA new axisymmetric equilibrium solver has been written, called FEQIS (Flexible EQuIlibrium Solver), which purpose is to be used inside integrated modeling of tokamak plasmas. The FEQIS code solves the Grad-Shafranov equation and the "circuit" equations for the external coils and passive conducting structures that are toroidally connected. The code has been specifically equipped with flexibility in choice of circuit connections, and a stripped-down numerical scheme for the solution of the Grad-Shafranov equation through a structure of multi-level simplifications which can be tested against the required accuracy.Plasma PhysicsAttribution - Pas d'Utilisation Commerciale - Pas de Modification 4.0 International (CC BY-NC-ND 4.0)2025-01-272025-02-242025-02-24engUniversité de Lorrainejournal article arXiv:2410.1363010.48550 /arXiv.2410.136303076-1468open accesshttp://ops.episciences.org/14641/pdfVoRapplication/pdfOpen Plasma ScienceVolume 1ResearchersStudents