HYDROGEN TRAPPING IN NICKEL PRE-IMPLANTED WITH HELIUM

The interaction of hydrogen isotope atoms with plasma facing component s has an important role in the fuel recycling of future thermonuclear fusion reactors. The present paper summarizes earlier works that have been conducted to study trapping and release of hydrogen isotopes in n ickel preimplanted with helium. Thermal desorption measurement was ana lyzed by the computer simulation code DIFFER to evaluate the trapping characteristics, i.e. the effective trapping energy and trapping effic iency. Emphasis is placed on the effect of helium content and post-imp lantation annealing on the trapping behaviour. The mechanism responsib le for trapping of hydrogen isotope atoms at or near helium bubbles is discussed.