Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 25: Poster III
P 25.30: Poster
Thursday, February 29, 2024, 16:30–18:30, ELP 6: Foyer
Design of a dispersion interferometer at ASDEX Upgrade for disruption studies — •Andrew Moreau1,2, Alexander Bock2, Kai Jakob Brunner3, Andres Cathey2, Matthias Hoelzl2, Jens Knauer3, Jens Meineke3, and Thomas Puetterich2 — 1Ludwig Maximilian University of Munich, Faculty of Physics, 80799 Munich, Germany — 2Max Planck Institute for Plasma Physics, 85748 Garching, Germany — 3Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany
Disruptions significantly challenge the successful utilization of future tokamak-class fusion power plants which are predicted to be larger and operate at higher magnetic fields and plasma currents. The electron density is a key quantity needed in the investigation of plasma dynamics to understand the mechanisms of thermal and current quenches, the generation and suppression of runaway electrons and the mitigation or control of disruption effects. At ASDEX Upgrade (AUG) there are currently no interferometer diagnostics which can explore disruption or disruption mitigation scenarios free of fringe jumps, low signal-to-noise or vibration errors. We present work towards the commissioning of a dispersion interferometer at AUG which would harness the coherence conservation principle of second-harmonic generation in order to alleviate the need for a reference beam path. This reduces the complexity significantly and becomes intrinsically free of vibrational errors. With state-of-the-art nonlinear crystals, we increase the capabilities of this system in signal-to-noise. We then show how JOREK simulations can contribute to diagnostic modelling.
Keywords: tokamak disruptions; dispersion interferometer; plasma diagnostics; ASDEX Upgrade