München 2019 – scientific programme
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P: Fachverband Plasmaphysik
P 18: Postersitzung
P 18.56: Poster
Thursday, March 21, 2019, 16:30–18:30, Foyer Audimax
The ASDEX Upgrade room-temperature solid-state pellet injector adapted for COMPASS — •N. Hoepfl1,2, P. T. Lang1, B. Ploeckl1, D. Wu2, J. Cerovsky3,4, O. Ficker3,4, J. Mlynar3,4, V. Weinzettl3, and ASDEX Upgrade Team1 — 1MPI für Plasmaphysik, Boltzmannstr. 2, 85748 Garching — 2Munich University of Applied Sciences, Lothstr. 34, 80335 München — 3IPP Prague, Czech Republic — 4Faculty of Nuclear Sciences and Physical Engineering, Technical University, Prague, Czech Republic
The room-temperature solid-state pellet (RTSP) injector, used at ASDEX Upgrade, was revised and characterized for the COMPASS tokamak. The system operates with a gas gun accelerator providing a repetition rate of up to 2 Hz and is capable to launch spherical and cylindrical pellets. We tested a variety of pellet materials and different propellant gases. In its application at AUG cylindrical Li pellets of 1.5 mm diameter and 2 mm length were injected using Deuterium as propellant gas to study the impact of Li on the plasma performance. For COMPASS, where it is foreseen to be applied in runaway electron studies, the injector has been optimized and characterized in a test bed. Therefore, tests with cylindrical boron nitride (BN) pellets employing Argon and Helium propellant gas were performed. Pellets with a diameter of 1.5 mm and a length of 1 mm and 2 mm, respectively, have been tested. The pellet speed ranges from 130 m/s up to 700 m/s, depending on pellet size, propellant kind and pressure, the latter varying from 5 to 100 bars. Delivery efficiencies above 91% were achieved within a 1° maximum pellet trajectory scattering cone.