SMuK 2021 – scientific programme
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P: Fachverband Plasmaphysik
P 17: Poster II
P 17.16: Poster
Friday, September 3, 2021, 14:00–16:00, P
Modelling of plasma ion heat flux in the edge of ASDEX Upgrade with EMC3-EIRENE for an improved understanding of the H-mode access — •Philipp Sauter1,2, Thomas Eich1, Dominik Brida1, Marco Cavedon1, Tilmann Lunt1, and the ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany — 2Universität Tübingen, 72074 Tübingen, Germany
The future nuclear fusion device ITER will be operated in an improved confinement regime.. The access to H-mode relies critically on the ion heat flux crossing the edge region of the plasma [1]. This work analyses the role of the ion heat flux on the transition from L-Mode to H-Mode The EMC3-Eirene simulation code is used to simulate plasma discharges in ASDEX Upgrade at different powers and densities with varying proportions of heating in electrons and ions. Parallel and perpendicular heat fluxes are obtained in order to quantify heat fluxes crossing the separatrix and being transported to the divertor. In particular, it is investigated if the collisional heat exchange from ions to electrons at high collisonalities is able to reduce the ion heat flux to a level where an H-L back transition is triggered. Also, the correlation of the ion electron temperature ratio at the separatrix with various plasma parameters is investigated. Here it is found that the ratio of ion to electron heat fluxes crossing the separatrix correlates with that ratio, while no correlation with the collisionality parameter suggested previously [2] was found. [1] Ryter F. et al 2016 PPCF 58 014007 [2] Stangeby P. 2000, The Plasma Boundary of Magnetic Confinement