Berlin 2014 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 30: Plasma Wall Interactions
P 30.6: Vortrag
Freitag, 21. März 2014, 15:30–15:45, SPA HS202
Investigation of high-Z metal transport and fuel retention in the TEXTOR tokamak — •Armin Weckmann1, Petter Ström1, Per Petersson1, Arkadi Kreter2, and Marek Rubel1 — 1KTH Stockholm, Sweden — 2Forschungszentrum Jülich, Germany
Fuel retention and transport of high-Z metal (e.g. W or Mo) impurities eroded from wall components in tokamaks is crucial for understanding material migration mechanism which may be decisive for the performance of next generation fusion devices. To understand these processes an experiment was carried out at the TEXTOR tokamak on the last operation day of that machine. A controlled injection of Molybdenum Hexafluoride (MoF6), used as a tracer gas, was performed to determine the high-Z transport. This was accompanied by the injection of a nitrogen marker (15N isotope) to determine its accumulation in the machine. Following the experiment a large number of specimens were retrieved for ex-situ studies: (a) graphite and titanium short-term probes installed on test limiters only for that experiment and (b) components of the main toroidal and inner bumper limiters. Also dust samples from various locations were collected. The study is carried out by means of ion beam analysis methods, microscopy and thermal desorption to measure quantitatively the amount and distribution of deuterium, nitrogen and high-Z species in dust and on various plasma-facing components.