The problems encountered in developing FRP cryostat have been solved and the FRP cryostat was successfully constructed. The FRP cryostats were confirmed to show the good performances and hence are thought to be applicable for various fields. In this paper the problems in constructing the cryostats were discussed and the methodology to solve the problems are suggested based on the experimental results. Finally the applicability of the cryostat was also discussed.
Recent advances in superconducting wire technology, together with economic advantage of superconducting magnets to produce high magnetic field, have stimulated increasing interest in large scale superconducting apparatus such as superconducting magnet energy storage in electric power systems, superconducting magnets for fusion reactors and superconducting power generators. Electrical insulations may become one of critical design factors because high voltages are produced by stringent energy discharge and quenching in large superconducting magnets. In this review, abnormal overvoltage, performance of coolant liquids under high electric field and dielectric performance of insulating components in superconducting apparatus are described.
Hysteresis losses in superconductors are caused by irreversible motion of fluxoids. This motion is in most cases described by the critical state model. In this report various electromagnetic phenomena due to flux pinning effect are reviewed and explanations on these phenomena are given by the critical state model. The phenomena which cannot be well described by the present model, such as reversible fluxoid motion and the longitudinal field effect, are also introduced.