In our previous study, thermal runaway currents of a conduction-cooled single pancake coil wound with a Bi2223 tape wire were experimentally and numerically investigated and the relation between the cooling structure and the thermal runaway current was explained. On the basis of the results, we designed and fabricated a conduction-cooled HTS coil composed of 12 single-pancake coils and confirmed that the coil had a thermal stability as designed in DC operations. Secondly, the AC loss characteristics of the HTS coil were measured at 20-50 K and 0.05-2 Hz. Hysteresis losses of the coil were well explained using equations based on the Brandt model. As the result of the AC loss measurements, it was found that coupling losses were expressed as α(T)*(Bzf)2. Adopting the functions of hysteresis losses and coupling losses into the thermal stability analysis program developed in our previous study, the thermal stability of the conduction-cooled HTS coil was numerically investigated. In this paper, the thermal stability analysis results are described.
A communications satellite (INTELSAT) data receiving system with a 7.6m-diameter parabolic antenna was installed at Syowa Station in February 2004. We have carried out communications with the Antarctica station using a virtual private network (VPN) employing a S-Box. We began operation of a real-time monitoring system from Japan on August 26, 2004. The earthquake that recently occurred in Sumatra, Indonesia was observed from Japan using the superconducting gravimeter at Syowa Station.
For the LHC (Large Hadron Collider) project of the CERN (Conseil Européen pour la Recherche Nucléaire), the Swiss-Japanese consortium IHI/Linde Kryotechnik AG delivered a 1.8 K helium refrigeration system. Linde has produced many helium refrigeration systems and IHI has designed and manufactured cold compressors that utilize many advanced technologies and innovative ideas for turbo machinery. The compressor has the characteristics of the highest efficiency in the world. This paper describes the 1.8 K helium refrigeration system and performance test results at CERN.