Modification of the high fluence irradiation facility at the University of Tokyo: Assessment of radiation-induced amorphization of Zr(Cr,Fe)2 Laves phase under 180 keV-He+ irradiation

Abstract

The High Fluence Irradiation Facility at the University of Tokyo, which had provided a platform for dual-beam irradiation in Japan, was severely damaged by the 2011 earthquake. This paper reports a modification at this facility, i.e., installing a low-energy ion implanter instead of repairing the previous Van de Graaff accelerator. The platform of the dual-beam irradiation and/or s gas-ion beam irradiation was reconstructed, and the newly installed ion implanter was a stable, uniform, and high-density light element ion beam. The radiation-induced amorphization (RIA) behavior in Zr(Fe,Cr)2 Laves phase was investigated in 180 keV-He+ beam irradiation to assess the performance of this ion implanter, and the irradiation temperature and dose-dependent RIA behavior were confirmed. Implying that this modification ensures the capability in terms of gas-ion beam irradiation and dual-beam irradiation in this facility, which will promote the research progress on radiation effects in nuclear material.