1 Effects of simultaneous impurity ion irradiation on tritium behavior near tungsten surface Y. Ueda, M. Fukumoto, H. Kashiwagi, Y. Ohtsuka (Osaka University) R. Akiyoshi, H. Iwakiri, N. Yoshida (Kyushu Universi ty) International Workshop on Hydrogen Isotopes in Fusion Reactor Mater June 2 -3, 2008 Salamanca, Spain Osaka University
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Effects of simultaneous impurity ion irradiation on tritium behavior near tungsten surface
Osaka University. Effects of simultaneous impurity ion irradiation on tritium behavior near tungsten surface. Y. Ueda, M. Fukumoto, H. Kashiwagi, Y. Ohtsuka (Osaka University) R. Akiyoshi, H. Iwakiri, N. Yoshida (Kyushu University). - PowerPoint PPT Presentation
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1
Effects of simultaneous impurity ion irradiation
on tritium behavior near tungsten surface
Y. Ueda, M. Fukumoto, H. Kashiwagi, Y. Ohtsuka (Osaka University)
R. Akiyoshi, H. Iwakiri, N. Yoshida (Kyushu University)
9th International Workshop on Hydrogen Isotopes in Fusion Reactor MaterialsJune 2 -3, 2008
Salamanca, Spain
Osaka University
2Surface phenomena affecting T behavior
• Deposition layer– Trapping site for T– Diffusion barrier for T
• Mixing layer– Trapping site for T– Diffusion barrier for T– Desorption barrier
• He bubble layer– Trapping site for T– Diffusion barrier for T
• Radiation damage by n– Trapping site for T– Diffusion barrier for T
C, Be
DHe
Ne, Ar
deposition layer
mixing layer(collision mixing)
mixing layer(diffusion mixing)
He bubbles
Ero
sio
n
T
TT
T
WT
TT
O
w
Diffusion barrier
n
Radiation damage
T
3
Osaka University
Steady-State High-Flux Dual Ion Beam
Flux : ~1020 m-2, Energy: 0.15~3 keVBlanket first wall condition
4Enhancement of blister formation by carbon impurity
C concentration in H beam increases
No No blistersblistersFormation of blistersFormation of blisters