Author:
Herashchenko S.S.,Byrka O.V.,Makhlaj V.A.,Wirtz M.,Aksenov N.N.,Garkusha I.E.,Petrov Yu.V.,Malykhin S.V.,Surovitskiy S.V.,Masuzaki S.,Tokitani M.,Lebedev S.I.,Shevchuk P.B.
Abstract
The cracking thresholds were evaluated for tungsten samples with different microstructure in the course of QSPA Kh-50 repetitive plasma loads. No damage has been observed on the exposed surfaces under 0.1 MJ/m2. Nevertheless, cracks were detected in the bulk of irradiated tungsten (with longitudinal grain orientation). Increasing heat load up to 0.2 MJ/m2 caused the damaging of all types of tungsten targets. The observed cracks propagate to the bulk mainly transversely and parallel to the irradiated surface. The effect of the subsequent exposure with LHD divertor plasma on the tungsten samples was analyzed. The obtained results are discussed.
Publisher
Problems of Atomic Science and Technology
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