Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5453841 | Journal of Nuclear Materials | 2017 | 9 Pages |
Abstract
The effects of particle flux and exposure temperature on surface modifications and deuterium (D) retention were systematically investigated on four different tungsten (W) microstructures. As-received, recrystallized, and single crystal W samples were exposed to D plasmas at surface temperatures of 530-1170Â K. Two different ranges of D ion fluxes (1022 and 1024 D+mâ2sâ1) were used with the ion energy of 40Â eV and particle fluence of 1026 D+mâ2. Increasing the particle flux by two orders of magnitude caused blister formation and D retention even at temperatures above 700Â K. The main effect of increasing the particle flux on total D retention was the shifting of temperature at which the retention was maximal towards higher temperatures. Diffusion-trapping simulations were used to fit the thermal desorption spectroscopy (TDS) release peaks of D, yielding one or two types of trapping sites with de-trapping energies around 2Â eV.
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Authors
L. Buzi, G. De Temmerman, D. Matveev, M. Reinhart, T. Schwarz-Selinger, M. Rasinski, B. Unterberg, Ch. Linsmeier, G. Van Oost,