Neutron Induced Permanent Damage in Josephson Junctions

14 MeV neutron induced permanent changes in the critical current density of Josephson junctions due to displacement damage in the junction barrier are estimated using a worst case model and the binary collision simulation code MARLOWE. No likelihood of single event hard upsets is found in this model. It is estimated that a fluence of 1018-1019 neutrons/cm2 are required to change the critical current density by 5%.