期刊
NUCLEAR MATERIALS AND ENERGY
卷 16, 期 -, 页码 181-190出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nme.2018.07.001
关键词
Low energy ion scattering (LEIS); EUROFER; Plasma-surface interaction; Preferential sputtering; W diffusion in Fe; Diffusion activation energy
资金
- Swedish Foundation for Strategic Research (SSF) [RIF14-0053]
- Swedish Research Council (VR-RFI) [821-2012-5144]
- Euratom research and training programme [633053]
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 2x10(18) m(-2) s(-1) and maximum fluence up to 1.1x10(23) 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 yield an upper limit of 1.6 eV for the diffusion activation energy of tungsten in EUROFER.
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