Development of a dual ion irradiation facility for studies of radiation response in fission and fusion reactor materials

摘要

A dual ion beam radiation facility which provides co-implantation of heavy ion beams from a 1.7 MV accelerator and gaseous ions from an indigenously built 400 kV accelerator has been developed. Various aspects of the dual beam irradiation facility such as the beam optics design, electronics and instrumentation comprising of a distributed control system and details of the experimental end station have been discussed. Experiments to determine essential parameters for the conduct of dual irradiation such as the beam energy spread, the spatial and the depth overlap of both beams have been carried out. For a dpa rate of 1 x 10(-3) dpa sec(-1) the maximum He:dpa rate achieved using this system is 50 appm dpa(-1). This facility enables us to study the effect of a combination of large levels of transmutant helium and displacement damage (dpa) on the dimensional stability and mechanical properties of structural materials, He/dpa ratios on swelling in advanced alloys and co-operative effects of nuclear and electronic energy losses in nuclear structural materials.