Coil bobbin composed of high-strength polyethylene fiber reinforced plastics for a stable high-field superconducting magnet

High-field superconducting solenoid magnets sometimes quench by wire motion induced by electromagnetic force. Fiber reinforced plastic [Dyneema fiber reinforced plastic (DFRP)] pipes composed of high-strength polyethylene fib er by filament winding method could be constructed so as to expand in the c ircumferential direction when cooled to low temperature with an appropriate selection of winding angle and shape of the pipes. In the case of a superc onducting coil fabricated with a DFRP bobbin, it is expected that wire moti ons in high field are decreased by expansion of the coil bobbin. In this pa per, tap voltage between both ends of the coils fabricated with DFRP bobbin and stainless steel (SUS) bobbin were measured with increasing current. Th e coil using SUS bobbin showed many sharp peaks in tap voltage induced by q uick wire motions. In contrast, those using DFRP bobbin showed only a few s mall peaks. These results suggest that wire motions were constrained by DFR P bobbin. The training effects were observed in both cases.