Abstract
D retention in mixed layers of ITER first wall materials, i.e. Be 2C (prepared by annealing C film on Be substrate sample at 773 K), Be 12W (by annealing W film on Be substrate at 1073 K) and tungsten carbide (by annealing W film on graphite substrate annealed at 1373 K) was investigated under controlled laboratory conditions. D retention in Be 2C and Be 12W layers was similar to that of Be rather than that of graphite or W respectively, while D retention in tungsten carbide layers was similar to that of polycrystalline W rather than that of graphite. The fluence dependence of the retained D fraction in each mixed layer showed no clear saturation in the experimentally accessible implantation fluence range (<4.0 × 10 23 D/m 2), and increased with incident fluence as ∼ Φ 0.2 in Be 2C, Be 12W and ∼ Ф 0.5 in tungsten carbide.
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