Abstract
High field superconducting solenoid magnets sometimes quench by wire motion by electro-magnetic force. High strength polyethylene fiber reinforced plastic (DFRP) has a negative thermal expansivity, low frictional coefficients, high thermal conductivity, and high electric resistance. In the case of a superconducting coil fabricated with a DFRP bobbin, it is expected that wire motions in high field are decreased by expansion of the coil bobbin and that training becomes effective by low frictional coefficients on the surface of the bobbin. In this work, tap voltage between both ends of the coils fabricated with DFRP bobbin and stainless steel (SUS) bobbin were measured with increasing current. The coil using SUS bobbin showed many sharp peaks in tap voltage induced by quick wire motions and those using DFRP bobbin showed only a few small peaks. By the repetition of excitation of coil using SUS bobbin, some peaks vanish. In the case of DFRP bobbin, all peaks or zigzag curves vanish at 2^<nd> excitation. It is considered that conductor moved to stable positions at the 1^<st> excitation.
