Abstract
Beryllium will be used as a plasma facing material for ITER first wall. It is expected that erosion of beryllium under transient plasma loads such as the edge-localized modes (ELMs) and disruptions will mainly determine a lifetime of ITER first wall. The results of recent experiments with the Russian beryllium of TGP-56FW ITER grade on QSPA-Be plasma gun facility are presented. The Be/CuCrZr mock-ups were exposed to upto 100 shots by deuterium plasma streams with pulse duration of 0.5ms at ∼250°C and average heat loads of 0.5 and 1MJ/m2. Experiments were performed at 250°C. The evolution of surface microstructure and cracks morphology as well as beryllium mass loss are investigated under erosion process.
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