AbstractFor future design of fusion reactors, development of the remountable superconducting magnet can become one of the important technical issues, which will bring huge benefit to reduce both costs of reactor construction and maintenance. In the conventional design, however, there is a fatal problem of heat generation occurring at the joints, which causes quenching of the magnet. On the other hand HTc superconductors, which has large specific heat, are now being used for magnets. In the previous research [International Journal of Applied Electromagnetics and Mechanics, IOS Press, in press. Joint Conference of the 12th International Toki Conference on Plasma Physics and Controlled Nuclear Fusion and The Third General Scientific Assembly of Asia Plasma Fusion Association, Toki. 2001, in press], the butt jointing method of HTc S.C. tapes had been proposed and its contact performance had been reported to be relatively excellent. In this research, therefore, the current distributions in the tape are calculated by numerical analysis and then the heat generations in the jointing region are estimated to evaluate the difference of contact performance in some jointing cases. The results show that the contact performance does not dependent on relative location of each S.C. filaments.
将来の核融合炉設計において、再結合型超電導磁石の開発は重要な技術的課題の一つになり得る。これは、炉の建設コストと保守コストの両方を削減する大きな利点をもたらすからである。しかしながら、従来設計では、接続部で発生する発熱という致命的な問題があり、これが磁石のクエンチを引き起こす。一方、近年では、大きな比熱を持つ高温超電導体が磁石に使用されつつある。先行研究[International Journal of Applied Electromagnetics and Mechanics, IOS Press, in press. Joint Conference of the 12th International Toki Conference on Plasma Physics and Controlled Nuclear Fusion and The Third General Scientific Assembly of Asia Plasma Fusion Association, Toki. 2001, in press]では、高温超電導テープの突き合わせ接続法が提案され、その接触性能は比較的優れていることが報告されている。そこで本研究では、テープ内の電流分布を数値解析により計算し、接続領域での発熱を推定することにより、いくつかの接続ケースにおける接触性能の違いを評価した。その結果、接触性能は各超電導フィラメントの相対的な位置に依存しないことが示された。