面向高场应用的Bi2212高温超导磁体关键科学与技术问题研究

稳态强磁场的发展趋势是向更高磁场发展（>50T），以满足各学科对极端实验条件的需求。强磁场装置主要是由水冷磁体与超导磁体构成的混合磁体，50T以上的稳态混合磁体要求超导磁体必须能够提供15T~20T的磁场贡献，这对超导材料及磁体关键科学与技术问题提出前所未有的高要求。高温超导材料Bi2212由于具有临界场高、各向同性、交流损耗低的优点，具有发展CICC型高场磁体的巨大潜力。目前，国际上对此领域的研究基本处于起步阶段。本项目将依托中科院强磁场中心的高场水冷磁体以及等离子体物理研究所的磁体研制设施，探索Bi2212 CICC型高场超导磁体研制的关键科学和技术问题，开展材料特性、结构设计、制备技术、实验方法的研究，揭示多重载荷复杂工况下的材料失效、磁体性能衰退等科学规律，解决高温高压热处理、新型失超探测等技术问题，为未来高场高温超导磁体在强磁场、聚变堆、对撞机等大科学装置中的应用奠定坚实的基础。

In order to meet the extreme demands from diverse R&D disciplines, the steady-state strong magnetic field development is developing towards a higher magnetic field(>50T) with an obvious trend. High magnetic field devices are mainly hybrid magnets composed of water-cooled magnets and superconducting magnets. The steady-state hybrid magnets above 50T, require the superconducting magnets to be able to provide a magnetic field contribution of 15-20T, which places unprecedented high demands on the key scientific and technical issues of superconducting materials and magnets. The high-temperature superconducting material Bi2212 has the advantages of high critical field, isotropy, and low AC loss, which has great potential for the development of high-field magnets composed of CICCs. International research in this field is basically in its infancy. To explore the key scientific and technical issues in the development of Bi2212 CICC high-field superconducting magnets, the project will rely on the high-field water-cooled magnets of the Chinese Academy of Science High Magnetic Field Center and the magnet research facilities of the Institute of Plasma Physics. Based on these platforms, the project will carry out research on material characteristics, structural design, manufacturing technology, and experimental methods. The results of the project are expected to reveal the scientific laws such as material failure and magnet performance degradation, and to solve technical problems such as high temperature and high-pressure heat-treatment, new types of quench detection, etc. These studies will lay a solid foundation for the future application of high-field high-temperature superconducting magnets in large scale scientific devices such as High magnetic field, fusion reactors, and colliders.