Bremen 2017 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 2: Helmholtz Graduate School I
P 2.2: Vortrag
Montag, 13. März 2017, 08:55–09:20, HS 1010
Plasma-driven deuterium permeation through tungsten at 300 and 450 K — •Stefan Kapser1,2, Mitja Kelemen3, Armin Manhard1, Sabina Markelj3, Klaus Schmid1, Tiago Silva1,4, Primož Vavpetič3, and Udo von Toussaint1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany — 2Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany — 3Jožef Stefan Institute and Association EURATOM-MHEST, 39 Jamova cesta, Ljubljana 1000, Slovenia — 4Instituto de Física da Universidade de São Paulo, Rua do Matão, trav. R 187, 05508-090 São Paulo, Brazil
Deuterium permeation through tungsten under plasma exposure has been investigated for sample temperatures of 300 K and 450 K. Tungsten foils were exposed to deuterium plasma on one side, the permeating deuterium was accumulated in a getter layer on the other side. Subsequently, the deuterium amount in the getter was measured using nuclear reaction analysis (NRA). In addition, the deuterium depth distributions in the tungsten were investigated by NRA. Despite significant differences in the deuterium retention in the subsurface region of the plasma exposed tungsten, the measured permeation flux at both temperatures was similar. The experiments are interpreted based on trap-diffusion simulations. Additionally, microbeam-NRA was used to investigate the influence of the tungsten microstructure on the spatial homogeneity of the deuterium permeation flux.