New ideas in dosimetry and damage calculations for fusion materials irradiations

Abstract

Nuclear data and techniques are being developed to improve our ability to characterize fusion materials irradiations. The production of long-lived isotopes have been measured near 14 MeV, including reactions from AI, Fe, and Mo to 26A1, 53Mn, and 94Nb, respectively. These data can be used for fusion reactor activation, dosimetry, and plasma diagnostics. Dosimetry cross sections can be adjusted using measurements at Be(d,n) sources ( E d = 7–40 MeV ) and mono-energetic neutron sources from 1 to 14 MeV. Helium production cross sections are being tested at all fusion irradiation facilities. We have recently discovered a new thermal helium production in copper, similar to the well-known effect in nickel. Recommended cross sections and procedures are included. A new program SPECOMP has been developed to calculate displacement damage for compounds. This program uses the SPECTER recoil atom distributions and integrates over secondary displacement functions for each combination of incident ion and matrix material to determine displacement cross sections for alloys, insulators, and breeder materials.