Surface modifications and deuterium retention in polycrystalline and single crystal tungsten as a function of particle flux and temperature

TitleSurface modifications and deuterium retention in polycrystalline and single crystal tungsten as a function of particle flux and temperature
Publication TypeJournal Article
Year of Publication2017
AuthorsL. Buzi, G. De Temmerman, D. Matveev, M. Reinhart, T. Schwartz-Selinger, M. Rasinski, B. Unterberg, C. Linsmeier, G. Van Oost
JournalJournal of Nuclear Materials
Volume495
Pagination211-219
Date Published11/2017
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 530–1170 K. Two different ranges of D ion fluxes (1022 and 1024 D+m−2s−1) were used with the ion energy of 40 eV and particle fluence of 1026 D+m−2. Increasing the particle flux by two orders of magnitude caused blister formation and D retention even at temperatures above 700 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 2 eV.

DOI10.1016/j.jnucmat.2017.08.026
Division

PSI

Department

PMI

PID

6dde5204bf1c0e9821bf878f41cb8f66

Alternate TitleJ. Nucl. Mater.

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