Plasma effect on tungsten damaged by high-energy alpha particles: Erosion and deuterium trapping

摘要

Experimental study of tungsten at high level of displacement damage is reported. The damage of 1-80 dpa was produced by high-energy helium ions ~4He~(2+) (3-4 MeV) from cyclotron. Properties of the irradiated tungsten were studied in deuterium plasma on the LENTA linear divertor simulator. Plasma exposures were made at 250 eV of ion energy to reach fluence 10~(25)-10~(26) ion/m~2. Erosion dynamics of the damaged layer and deuterium retention were studied. Surface modifications have been observed in the damaged material. Increased deuterium retention was detected on damaged tungsten by nuclear analysis methods; implanted helium accumulation was also measured.