Abstract
Under simulation of ITER gaseous divertor operation in a dense stationary plasma of the LENTA-facility, the tungsten sputtering by 5-eV deuterons at 1470 K has been detected. The sputtering yield was equal to 1.5 × 10−4 atom/ion. Below 1250 K the sputtering was not observed. The mechanism of subthreshold W-sputtering, based on a potential adatomic sputtering by slow deuterons, is proposed. Under plasma disruption simulation the W-droplet diameter distribution in respect to a collector position has been studied. Large droplets, up to 6 µm in diameter, fly away nearly perpendicular to the surface. Small droplets fly off in parallel to the surface or return to it. The minimal erosion is found for tungsten W (1 1 1) and the maximal one for W-10% Re.
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