Influence of Helium-Generated Interstitial in Dual Ion Irradiations
Simulation of neutron-induced swelling by dual ion irradiation is influenced very strongly by the presence of injected interstitials due to self ions. Co-injected helium also generates extra interstitials, with its influence on void nucleation magnified by a synergism with those due to self ions. Low energy experiments are particularly affected since measurements have to be made where most ions come to rest. When the high helium/dpa ratios typical of fusion devices are employed the effect of helium-generated interstitials may dominate that of helium-as-gas. Co-injected helium therefore often appears to decrease swelling at a given damage level. The suppression of void nucleation by helium-generated interstitials decreases with increasing sink strength and is dominant at both low temperatures when recombination is high and at high temperatures when vacancy re-emission from vacancy clusters is significant. It is proposed that this behavior is an artifact of the simulation process and is atypical of the fusion reactor environment.
A. S. Kumar, "Influence of Helium-Generated Interstitial in Dual Ion Irradiations," Journal of Nuclear Materials, Elsevier, Jan 1985.
The definitive version is available at http://dx.doi.org/10.1016/0022-3115(85)90194-1
Mining and Nuclear Engineering
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