K. Seo et al., THERMAL-PROPERTIES OF IMPREGNATING MATERIALS FOR STABLE SUPERCONDUCTING MAGNETS, IEEE transactions on applied superconductivity, 7(2), 1997, pp. 155-158
The minimum quench energies (MQEs) of superconducting (SC) wires have
been measured precisely by means of a 'Carbon Paste Heater'. The therm
al behavior just before the normal generation of the heavy loaded SC w
ire was observed to determine the quenching We learned that once a nor
mal region is produced, it should spread rapidly regardless of the sur
rounding conditions The MQE, however, would increase when a local temp
erature rise before quenching is prevented by using certain materials
around the SC wire. For example, high thermal diffusivity in impregnat
ing materials or low thermal conductivity in wire insulation will be n
eeded when disturbances occur outside of the SC wires In the previous
paper, we showed the effects of enamel insulation for improving stabil
ity. Thus, in this study, we examine the relation between MQE and the
thermal properties of the impregnating material Several kinds of impre
gnating materials were selected and the thermal properties are compare
d with enlarging MQE in mind. We have searched for an impregnating mat
erial that has the thermal property required for improved stability.