Abstract
An experiment which simulates some of the aspects of fusion reactor first wall environment 3- stress and temperature cycling and multi-energy ion bombardment 3- is described. A 316 SS pressure capsule which has been cycled 14,000 times while accumulating a dose of ∼1×10 23 He and Li ions/m 2 is compared to a non-ion-bombarded control capsule which has been cycled 16,000 times under similar conditions. The ion damaged sample was found to have approximately four times as many short surface cracks as the control sample at the region of maximum stress. Although no evidence of such cracks penetrating beyond the ion-implanted surface layer was found, further experiments carried to higher doses and more cycles are considered necessary to fully determine the effects of such layers on first wall lifetimes.
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