Study on Systematic Application of Superconductivity and Cryogenic Technologies to Controlled Nuclear Fusion

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In order to realize the controlled nuclear fusion, cryogenic engineering is needed to cool down the large superconducting coil system to create huge magnetic field and keep it at cryogenic temperature. The systematization of the cryogenic engineering and the systematic application are desired as a part of the fusion device engineering. In this study, the investigation has been carried out mainly based on the following fields ; large scale superconducting magnet system, large-scale helium cooling including the super fluid helium cooling, applications of high critical temperature superconductors (HTS) to current feeders and electricity transmission, power control of superconducting coils, mechanical properties of cryogenic structural materials.The large-scale superconducting coil system is now under construction for Wenderstein 7-X in Germany. Forschungszentrum Karlsruhe in Germany and Saclay institute in France will test all the coils to check the superconductivity. The effective scenario of the cooling is constructing by taking account of the experience in the Large Helical Device project.The investigations on HTS, such as Bi system and YBCO, have been performed energetically. The wire of Ag-sheathed Bi2223 is supplied stably. The application to the large superconducting coil is not easy because of the poor mechanical properties, but it is promising to apply the HTS wires to superconducting electricity transmission. The production of the thin film of YBCO is rather hard and about 3 μ m thick films are expected to use in several engineering fields. The HTS will be used as current feeders and electricity transmission in the fusion devices.