Abstract
Tests of the candidate plasma facing materials (PFMs) used in experimental fusion devices are essential due to the direct influence of in-situ plasma loading. A type of ultra-fine grained (UFG) tungsten sintered by resistance sintering under ultra-high pressure (RSUHP) method has been exposed in the edge plasma of the HT-7 tokamak to investigate its performance under plasma loading. Under cyclic edge plasma loading, the UFG tungsten develops both macro and micro cracks. The macro cracks are attributed to the low temperature brittleness of the tungsten material itself, while the micro cracks are generated from local intense power flux deposition.
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