Mainz 2022 – scientific programme

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P: Fachverband Plasmaphysik

P 9: Poster I

P 9.16: Poster

Tuesday, March 29, 2022, 16:00–17:30, P

Characteristics of Alfvénic modes in ASDEX Upgrade disruptions — •Paul Heinrich, Gergely Papp, Philipp Lauber, Mike Dunne, Valentin Igochine, Oliver Linder, Marc Maraschek, the ASDEX Upgrade team, and the EUROfusion MST1 team — Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany

ASDEX Upgrade has developed multiple massive gas injection-induced scenarios to investigate runaway electron (RE) dynamics. During the current quench of these disruptions, Alfvénic activity is observed in the 300–800 kHz range. These modes are investigated as potential runaway electron mitigation candidates. With the help of a mode tracing algorithm, mode behaviour for 180 discharges was classified. The modes are potentially identified as global Alfvén eigenmodes (GAEs). Changes in the Alfvén continuum during the quench can explain the strong frequency sweep of these modes. A systematic statistical analysis revealed no significant effect of the mode characteristics on the dynamics of the subsequent runaway electron beam.