SMuK 2021 – scientific programme

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P: Fachverband Plasmaphysik

P 5: Poster I

P 5.39: Poster

Tuesday, August 31, 2021, 14:00–16:00, P

Disruption simulations in ASDEX Upgrade with JOREK-STARWALL — •Nina Schwarz, Matthias Hoelzl, Javier Artola, Gabriella Pautasso, and Mike Dunne — Max Planck Institute for Plasma Physics, 85748 Garching, Germnay

During major disruptions or due to a loss of the control system in tokamaks, the plasma becomes vertically unstable and eddy currents are induced in the conducting structures and halo currents appear in the SOL. The magnitude of the resulting vertical forces have not been successfully extrapolated to reactor sized tokamaks yet [Hender2007]. Also, horizontal forces can appear, when the plasma shows asymmetric features that may rotate. To estimate the magnitude and the distribution of halo currents as well as the forces during disruptions the extended non-linear MHD code JOREK is used together with the electro-magnetic code STARWALL to study the evolution of halo currents and forces during disruptions and hot VDEs in ASDEX Upgrade.

In particular, the discharge #25000 the vertical control system was intentionally shut off to produce a hot VDE and has been analyzed in detail [Pautasso2011]. This shot has been modelled before in the two dimensional codes DINA [Lukash2010] and TSC [Nakamura2010] to study the halo current magnitude during disruption following the vertical displacement. The aim of this contribution is to show first 2D calculations in JOREK to validate the magnitude of the halo currents at a given halo width and temperature. This will later be used as a basis to extend the simulation to 3D and observe non-axissymmetric effects of the plasma and halo current evolution.