Thermal depth profiling of nickel after He-ion irradiation

For nickel, a candidate material for pump limiter plates in Tokamak reactors, the effects of He-ion implantation on the thermal properties have been measured by means of IR detection of thermal waves. For ion energies of 25 - 100 KeV considerably reduced thermal properties have been found just at the surface, for ion energies of 1 - 3 MeV the reduced thermal properties are mainly deeper below the surface. (orig.)