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arXiv · 1803.01800

Temperature-Dependent In-Situ LEIS Measurement of W Surface Enrichment by 250 eV D Sputtering of EUROFER

H. R. Koslowski·S. R. Bhattacharyya·P. Hansen·Ch. Linsmeier·M. Rasiński·P. Ström
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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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H. R. Koslowski, S. R. Bhattacharyya, P. Hansen, Ch. Linsmeier, M. Rasiński, P. Ström. 2018-03-05. Temperature-Dependent In-Situ LEIS Measurement of W Surface Enrichment by 250 eV D Sputtering of EUROFER. https://doi.org/10.1016/j.nme.2018.07.001

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