guest ::
| Home > Publications database > Surface morphology in tungsten and RAFM steel exposed to helium plasma in PSI-2 |
| Home > Publications database > Surface morphology in tungsten and RAFM steel exposed to helium plasma in PSI-2 |
| Journal Article | FZJ-2018-01634 |
; ; ; ; ; ; ; ;
2017
IoP Publ.
Bristol
This record in other databases: 
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.
; Current Contents - Physical, Chemical and Earth Sciences ; National-Konsortium ; Nationallizenz
; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
|
The record appears in these collections: |
PDF
PDF (PDFA)