| Autor: |
V.I. Vasiliev, S. N. Korshunov, V. V. Zatekin, V.M. Gureev, V.S. Kulikauskas, M. I. Guseva, L.S. Danelyan |
| Rok vydání: |
2000 |
| Předmět: |
|
| Zdroj: |
Fusion Technology. 38:357-362 |
| ISSN: |
0748-1896 |
| Popis: |
The mixed W-Be layers were prepared by deposition of Be and W atoms on a Be substrate under simultaneous sputtering of Be and W targets by 20 keV Ar + -ions. The thickness of the deposited mixed W-Be layer was ∼500 nm. The element composition analysis of these layers showed that the mixed layer contains up to 35 at.% W, up to 35 at.% Be and up to 30 at.% O. The W-Be films on Be were irradiated by pulsed deuterium plasma flux in the electrodynamic plasma MKT-accelerator with a deuterium plasma concentration of 10 21 m -3 , maximal ion energy of (1-2) keV and with the energy flux density of 0.2 MJ/m 2 per pulse. The pulse duration was equal to 60 ps. After irradiation by two plasma pulses the W-Be film is melted and removed completely from the local surface areas. The element distributions in a mixed layer after an effect of the pulsed plasma are essentially changed. For the surface areas with the removed film the Be concentration is about 75 at.%, W - about 15 at.%, O - about 10 at.% and the penetration of W and O atoms is up to 1000 nm deep of Be substrate. For the surface areas with the retained melted film the Be surface concentration increase up to 90 at.%, tungsten and oxygen concentration decrease about 2-3 times. The method of Elastic Recoil Detection Analysis was used to study D retention. The integral deuterium concentrations are equal to 0.6-10 20 and 2.2-10 20 m -2 for the removed film areas and for the retained melted film ones, correspondingly. Consequently, deposited W-Be film promotes the essential reduction of D retention in Be substrate. Transmission electron microscopy was used to study the erosion product size distribution. The erosion products were collected on basalt filter fibers located in a shadow of the pulsed plasma flux around the exposed W-Be film target. The erosion product size distribution has two maxima located in the ranges 0.1-0.2 μm and 2.5-5.0 μm. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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