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| Hauptseite > Publikationsdatenbank > Surface morphology in tungsten and RAFM steel exposed to helium plasma in PSI-2 |
| Hauptseite > Publikationsdatenbank > Surface morphology in tungsten and RAFM steel exposed to helium plasma in PSI-2 |
| Journal Article | FZJ-2018-01634 |
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2017
IoP Publ.
Bristol
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Please use a persistent id in citations: doi:10.1088/1402-4896/aa93a2
Abstract: Impact of the helium plasma exposure on the surface modification in tungsten and reduced activation ferritic/martensitic (RAFM) steel have been investigated on the linear plasma device PSI-2 assuming the condition of DEMO first wall. In tungsten, a nanoscale undulating surface structure, which has a periodic arrangement, is formed under low temperature conditions below fuzz nanostructure formation threshold ~1000 K. Interval and direction of the undulation shows dependence on the crystal orientation. A large variation in surface level up to 200 nm has been observed among grains at a fluence of $3\times {10}^{26}$ He m−2 showing dependence of the surface erosion rate on the crystal orientation. The {100} plane in which the undulating surface structure is not formed shows the highest erosion rate. This significant erosion is due to the multistage sputtering through impurity. In RAFM steel, sponge-like nanostructure is developed and it grows with increasing helium fluence beyond 1 μm. In the sponge-like nanostructure, a composition change from the base material is observed in which the tungsten ratio increases while the iron ratio decreases showing differences in sputtering ratio depending on the atomic mass.
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