Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 12: Poster session I
MM 12.30: Poster
Montag, 1. April 2019, 19:15–20:45, Poster C
Experimental Studies of Helium Diffusion and Trapping in Tungsten — •Vassily Vadimovitch Burwitz1,2,3, Thomas Schwarz-Selinger2, Thomas Dürbeck2, Georg Holzner2,4, Rodrigo Arrendo Parra2,4, and Christoph Hugenschmidt1,3 — 1Physik Department E21, TU München — 2Max-Planck-Institut für Plasmaphysik (IPP) — 3Heinz Maier-Leibnitz Zentrum (MLZ) — 4Lehrstuhl für Plasma-Material-Wechselwirkung, Fakultät für Maschinenwesen, Technische Universität München, 85748 Garching, Germany
Helium is insoluble and highly mobile in tungsten. However, bubbles and blisters are commonly found in helium ion exposed samples. While the bubble growth parameters are known, the bubble nucleation process is still unclear. A hypothesized explanation based on ab initio calculations is a combination of self-trapping and trap mutation. Three independent experimental methods are used to check these predictions: Temperature Programmed Desorption (TPD), Elastic Recoil Detection Analysis (ERDA) and Coincident Doppler Broadening Spectroscopy (CDBS). In combination, these techniques will yield trap concentration, trap energy, and helium distribution. A unique TPD setup that can reach a maximum temperature of 3000 K while preserving UHV conditions, a CDBS setup located at the worlds brightest positron source (NEPOMUC) and a foil-ERDA setup as well as first measurements of the system He in W will be presented.