Bremen 2017 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 14: Plasma Wall Interaction
P 14.4: Poster
Dienstag, 14. März 2017, 16:30–18:30, HS Foyer
A multipurpose room-temperature solid-state pellet launcher for ASDEX Upgrade — •Raphael Hoepfl1,2, Martin Balden1, Thomas Haertl1, Otto J. W. F Kardaun1, Peter T. Lang1, Rudolf Neu1,3, Bernhard Ploeckl1, Volker Rohde1, Datong Wu2, and ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching — 2Munich University of Applied Sciences, Lothstr. 34, 80335 München — 3Technische Universität München, Boltzmannstr. 15, 85748 Garching
Recently, a system for the injection of lithium (Li) pellets into the Tokamak ASDEX Upgrade was developed. It is capable to launch mm-sized pellets at speeds up to 600 m/s with 2 Hz repetition rate. Now, the system was revised to act as a multipurpose unit for injecting different types of room-temperature solid-state pellets. As a first application, wall conditioning is envisaged. Encouraged by the favorable behavior observed during plasma start up gained by small amounts of Li, the idea is to inject solid-state boron (B) for wall conditioning. Usually the latter is performed burning a 4 hour long glow discharge in a He B2H6 mixture depositing about 1023 B atoms, conducted typically monthly after about 350 plasma discharges. Presently, boron nitride (BN) is selected as pellet material. The co-injection of nitrogen should be tolerable as it is introduced anyway regularly for radiative cooling and performance investigations. About 1020 B atoms per pellet and 1021 per discharge could be delivered, possibly sufficient for supplementary wall conditioning. Currently, BN raw material from different sources covering a variety of sizes, consistency and purity are investigated.