Lap test of epoxide resin at cryogenic temperatures

This chapter attempts to gather basic information about the initiation of defects, which may control magnet degradation, and to clarify the problems concerning the stability of superconducting magnets. Divides the study into 3 parts: the race track coil test, in which coils are stretched at low temperatures in order to observe the boundary behavior under stressed conditions; a compression test of epoxide resins to determine the mechanical properties of the basic material; and a lap test to obtain basic information about the mechanical behavior of the potting materials as the adhesive which fixes the wires to each other. Concludes that the boundary behavior between wire and potting material may control the performance of magnets in practice; materials used in composite form such as impregnating materials should be selected after careful consideration not only of the mechanical properties themselves but also of adhesive strength; and the cohesive force does not always reflect the adhesive strength