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Article Dans Une Revue Physica Scripta Année : 2017

Surface morphology in tungsten and RAFM steel exposed to helium plasma in PSI-2

Résumé

Impact of the helium plasma exposure on the surface modification in tungsten and RAFM (Reduced Activation Ferritic/Martensitic) 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 ×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 $\mu$m. 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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Dates et versions

hal-01795072 , version 1 (18-05-2018)

Identifiants

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Ryuichi Sakamoto, Elodie Bernard, Arkadi Kreter, Céline Martin, Bernard Pegourié, et al.. Surface morphology in tungsten and RAFM steel exposed to helium plasma in PSI-2. Physica Scripta, 2017, T170, pp.014062. ⟨10.1088/1402-4896/aa93a2⟩. ⟨hal-01795072⟩
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