Deuteron-induced activation data in EAF for IFMIF calculations

The main type of activation calculations needed for fusion technology relate to the interaction of neutrons with materials. The roadmap for development of fusion as an electricity producing technology is based on ITER and IFMIF followed by DEMO. IFMIF is a materials testing facility that will qualify the materials needed for DEMO. IFMIF will use intense beams of high-energy deuterons striking a flowing lithium target to produce the neutron field. The neutron spectrum contains significant neutrons with energy up to 55 MeV. In addition, the deuterons will themselves make a contribution to activation especially in the target where they strike the lithium but also due to beam losses in the accelerator. A preliminary deuteron library was released as part of the maintenance release of EAF-2005.1. This was used to calculate the activation in the lithium target due to reactions of the deuterons with the corrosion products. These calculations show that the deuterons are much more important than the neutrons (about a factor of 70) in activating elements other than lithium. The ongoing work to update the library using improved model calculations and available experimental data is described. This new library will form part of EAF-2007 planned for release next year.