高温超导带材CCT型二极磁体关键技术研究

Canted-Cosine-Theta（CCT）型磁体具有好场区大、线圈应力小等优点，是一类新兴的多极磁体。使用二代高温超导材料可以进一步提升其临界磁场，堆叠带材结构可承载较高工程电流密度，有助于提高二极场强度，其难点在于设计满足带材刚度要求的线圈槽结构及磁体的最大载流与磁场高阶量分析。本项目采用二代高温超导带材绕制CCT型磁体并研究其载流能力与磁场质量：开发交互设计软件，利用智能算法优化设计CCT线圈线电流模型，然后基于线电流模型采用等周长法优化设计线圈槽方案；利用3D打印及数控技术试制及加工线圈骨架，采用YBCO带材绕制出线圈；测试短样临界电流，研究CCT型线圈形状对带材临界电流的影响，并测试磁体的最高载流，研究磁体载流性能随外场强度及角度变化的规律；基于Brandt模型分析磁体动态磁场高阶分量，并与测试结果进行比较。研究成果有望为高场二极磁体的进一步发展提供技术支撑。

Canted-Cosine-Theta（CCT）type magnet is becoming a research hotspot recently in the field of multipole magnet technology because of its wide homogeneous field bore and good stress performance. Critical magnetic field strength could be enhanced by fabricating with second-generation high-temperature superconducting tapes. Moreover stack tapes hold rather high engineering current density, which is helpful to strengthen the dipole field of accelerator, while the difficulty lies in the groove design which meets the requirement of tape rigidity,.maximum current research and the field quality analysis. The project will wind a CCT type magnet with YBCO tapes and measure the current-carring performance and the field quality: develop the interactive designing software to optimize the ideal line current model for CCT coil with intelligence algorithm, and design the coil groove by minimum stress model with the constant perimeter method based on the differential geometry theory; process the coil former and the groove by 3D printing and CNC technology, and wind the coil with YBCO tapes; measure the.criticle current of short sample to research the influence of CCT structure impacting on the Ic, and measure the maximum running current of the magnet to uncover the relevance between the Ic and the strength or angle of background field; analyse the dynamic field high order components with Brandt model, and compare it with the test result. The research result are expected to promote the further development of high field dipole magnet technology.