Characterization of the irradiation parameters in the IFMIF high flux testregion

The purpose of the international fusion materials irradiation facility (IFM IF) is to provide typical D-T fusion irradiation conditions for future mate rial testing and material development. In order to demonstrate the suitabil ity of IFMIF for irradiation experiments a comprehensive characterization o f the neutronics of the high flux test region (HFTR) has been carried out. For Fe, the neutron flux density was found to range between 4 x 10(14) and 10(15) n/s cm(2) which corresponds to 20-55 DPA/FPY in a maximum volume of 550 +/- 180 cm(3). Gas production rates were calculated and a H/DPA ratio o f 35-50 appm/DPA and a He/DPA ratio of 10-12 appm/DPA were found, which are very similar to those of a DEMO D-T fusion reactor. Additionally, an analy sis of the primary knock-on spectra has been performed and a displacement d amage characteristic in IFMIF almost ideal to the first wall of DEMO was fo und. IFMIF therefore provides an adequate environment for the simulation of D-T fusion reactor irradiation conditions. (C) 1998 Elsevier Science B.V. All rights reserved.