SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Poster I
P 11.29: Poster
Mittwoch, 22. März 2023, 14:00–15:30, HSZ EG
Properties of Metal Droplets Ejected During Arcing — •Alberto Castillo Castillo1,2, Martin Balden1, Volker Rohde1, Peter Siemroth3, Michael Laux3, Heinz Pursch3, Juergen Sachtleben3, and Rudolf Neu1,2 — 1Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany — 2Technische Universität München, 85748 Garching, Germany — 3retired, was with Arc-Precision GmbH, 15711, Germany
Droplet generation by arcing is one of the mechanisms that can generate dust in a fusion device. Metal droplets expelled by arcs can potentially introduce impurities in the plasma and influence operation. The diameter and velocities of droplets determine their capacity to penetrate the outer layers and, therefore, the measurement of their distributions allows prediction of the impact on plasma operation.
In order to investigate the properties of the droplets produced by arcs a dedicated laboratory device is used based on time of flight detection by light scattering. Additionally, a high speed camera has been added for the observation of expelled droplets in larger quantities than the time of flight system. Tracking software obtains trajectories from video recording to complement the statistics obtained from the time of flight system and allow back-tracking of the droplets point of origin as well as calculating the velocity distribution. Video recording reveals the existence of explosive droplet emission events that could potentially be the source of larger diameter droplets. Microscopy observations of the remaining origin craters provide insight on the emission process of different fusion relevant materials, focusing on tungsten.