Evelopment of a Highly-stable Superconductor with Controlled Current Distribution

作为前期工作，我们研究了超导电缆中电流分布不均匀对稳定性的影响。当将股线电缆之间的电流传输特性维持在电流传输部分中的放能不会使稳定性恶化的参考值以上时，即使股线之间出现不均匀电流，也表明对稳定性的影响很小。获得了上述研究结果，并进行了控制导体中电流分布的高稳定性导体的开发研究。控制导体中的电流分布，并进行了重新确保高稳定性和降低交流损耗的绞合电缆结构的超导导体的开发研究。首先，设计了导体中的电流分布和交流损耗的关系。据报道，低频区附近的一个运营商， ...更多信息 从采用电缆套管导体的大型超导线圈的交流损耗的测量结果来看，交流损耗的增加被认为是阻碍大型超导线圈使用的新因素，并对可能的原因进行了调查。在本研究中，使用2股绞合电缆的元件实验进行的基础上，它是在一股绞合电缆导体中的电流分布的不均匀性变化到导体纵向的估计的原因。结果表明，扭转湍流引起的电流分布不均匀性是导致交流损耗增大的可能原因。其次，基于导体中电流分布对稳定性和交流损耗影响的研究结果，提出了一种新结构超导导体的设计概念，使稳定性和低交流损耗相平衡。根据该设计思想进行了试制导线的设计，并对其交流损耗和稳定性进行了分析。此外，为了检查导体制造的可行性，进行了导体试生产。少

We have studied the effects of the ununiform current distribution in the superconducting cab le to stability as a preceded research work. When maintaining the current transfer characteristic between strand cable beyond the reference value with which exoergic in a current transfer part does not worsen a stability, even if the ununiform current arose in between strands, it was shown that the affection on a stability is small. The above-mentioned research result was received and development research of the conductor of the high stability which controlled the current distribution in a conductor was performed. The current distribution in a conductor was controlled and development research of the superconducting conductor of the stranded-cable architecture of reconeiling insurance of a high stability and the reduction of an AC loss was performed. First the current distribution in a conductor and the relation of an AC loss were devised. It is reported by the low-frequency area near an operati … More on frequency from the measurement result of the AC loss of the large-scale supercondueting coil using the cable-in-conduit conductor that an AC loss increases, It is considered as the new factor which obstructs utilization of a large-scale superconducting coil and investigation of the possible cause was hurried. In this research, the element experiment using 2 stranded cables was performed based on the estimate that it is the cause that the ununiformity of the current distribution in a stranded-cable conductor varies to a conductor longitudinal. It was shown that the ununiformity of the current distribution resulting from twist turbulence becomes the possible cause of an AC-loss enhancement, Next based on the research result about the effects of the current distribution in the conductor to stability and AC losses, the design concept of a new-architecture superconducting conductor which made the stability and the low AC loss balance was proposed. The design of a trial production conductor based on this design concept was performed, and the AC loss and the stability were analyzed. Moreover, in order to examine the feasibility of conductor manufacturing, the conductor trial production was performed. Less