Fast neutron radioactivity and damage studies on materials

Many materials and electronics need to be tested for the radiation environment expected at linear colliders (LCs) to improve reliability and longevity since both accelerator and detectors will be subjected to large fluences of hadrons, leptons and gammas. Examples include NdFeB magnets, considered for the damping rings, injection and extraction lines and final focus; electronic, electro- and fiber-optics to be utilized in detector readout, accelerator controls and the CCDs required for the vertex detector; as well as high and low temperature superconducting materials (LTSMs) for cavities and some magnets. Our first measurements of fast neutron, stepped doses at the UC Davis McClellan Nuclear Reactor Center (UCD MNRC) were for NdFeB materials at EPACO4[1]. We have extended the doses, included more manufacturer´s samples and measured radioactivities. We also added L and HTSMs and various semiconductor and electro-optic materials such as photonic band-gap (PBG) fiber that we studied previously with gamma rays.