Berlin 2014 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Poster Session - Magnetic Confinement
P 12.4: Poster
Dienstag, 18. März 2014, 16:30–18:30, SPA Foyer
Blower Gun pellet injection system for W7-X — •Mathias Dibon1, Jürgen Baldzuhn1, Michael Beck1, Antonio Cardella2, Florian Köchl3, Gabor Kocsis4, Peter Lang1, Rafael Macián-Juan2, Bernhard Plöckl1, Tamas Szepesi4, and Wolfgang Weisbart1 — 1MPI für Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany — 2Lehrstuhl für Nukleartechnik, TU Munich, Boltzmannstr. 15, 85748 Garching, Germany — 3Association EURATOM-ÖAW/ATI, Atominstitut, TU Wien, 1020 Vienna, Austria — 4Wigner RCP, RMI, EURATOM Association, P.O.Box 49, H-1525 Budapest-114, Hungary
Foreseen to serve for the new stellarator W7-X for pellet investigations, the former ASDEX Upgrade Blower Gun was revised and revitalized in a test bed. The gun is able now to launch cylindrical pellets of 2 mm diameter and 2 mm length, produced from frozen Deuterium (D2) or Hydrogen (H2). Pellets are accelerated by a short pulse of pressurized helium propellant gas to velocities in the range of 100-250 m/s. Delivery reliabilities at the launcher exit close to unity are achieved. For pellet transfer to the plasma vessel a first mock up guiding tube version was investigated. Transfer through this S-shaped (inner diameter 8 mm; length 6 m) stainless steel guiding tube containing two 1 m curvature radii was investigated for both H2 and D2 pellets. Tests were performed applying repetition rates from 2 Hz to 50 Hz and propellant gas pressures ranging from 1 bar to 6 bar. For both H2 and D2, low overall delivery efficiencies were observed at slow repetition rates, but stable efficiencies of about 90% above 10 Hz.