Temperature-dependent in-situ LEIS measurement of W surface enrichment by 250 eV D sputtering of EUROFER

Koslowski, H. R.; Bhattacharyya, S. R.; Linsmeier, Ch.; Ström, P.; Hansen, P.; Rasiński, M.

doi:10.1016/j.nme.2018.07.001

Journal Article

FZJ-2018-04554

Temperature-dependent in-situ LEIS measurement of W surface enrichment by 250 eV D sputtering of EUROFER

Koslowski, H. R. (Corresponding author)FZJ* ; Bhattacharyya, S. R. ; Hansen, P.FZJ* ; Linsmeier, C.FZJ* ; Rasiński, M.FZJ* ; Ström, P.Extern*

2018
Elsevier Amsterdam [u.a.]

Nuclear materials and energy 16, 181 - 190 (2018) [10.1016/j.nme.2018.07.001]

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Please use a persistent id in citations: http://hdl.handle.net/2128/19461 doi:10.1016/j.nme.2018.07.001

Abstract: Tungsten surface enrichment of EUROFER steel by 250 eV deuterium sputtering is in-situ measured using low energy He$^{+}$ ion scattering spectroscopy. The samples are irradiated at various temperatures between 300 K and 800 K with a deuterium atom flux of 2e18 m$^{-2}$s$^{-1}$ and maximum fluence up to 1.1e23 m$^{-2}$. The measurements at room temperature show a clear increase of tungsten surface density, but already at 520 K the observed enrichment is only half as large. At a temperature of 800 K no tungsten surface enrichment is detectable. The obtained data allows to determine an upper limit of 1.6 eV for the diffusion activation energy of tungsten in EUROFER.

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