Abstract
A construction of accelerator-based neutron irradiation facility is required to develop materials for a demonstration fusion reactor. To obtain a 14 MeV neutron energy using the neutron-generating D-Li stripping reaction, an injection into liquid lithium flow by a 40 MeV deuteron beam is employed in IFMIF design concept. In the acceleration of deuteron beam, the activation due to the beam loss is a critical issue. The activation analyses for the air in an accelerator vault are performed by PHITS code and DCHAIN code in the first step, using the experimental data for deuteron induced thick target neutron yield at 5 MeV and 9 MeV as source term and a simple model of the 1 m-long beam duct. For the 9 MeV-1 μA beam loss,
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