Design and Fabrication of a 13-T Twin-Aperture Superconducting Dipole Magnet With Graded Common-Coil Configuration
Design and Fabrication of a 13-T Twin-Aperture Superconducting Dipole Magnet With Graded Common-Coil Configuration
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DOI：
10.1109/tasc.2023.3346368
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发表时间：
2024
影响因子：
1.8
通讯作者：
Chengtao Wang;Ze Feng;Yingzhe Wang;Jinrui Shi;Wei Li;Rui Ma;Yaqiang Wang;Hongjun Zhang
中科院分区：
文献类型：
--
作者：
Chengtao Wang;Ze Feng;Yingzhe Wang;Jinrui Shi;Wei Li;Rui Ma;Yaqiang Wang;Hongjun Zhang
中国科学院高能物理研究所正在进行高场加速器磁体的研发2021年，在两个14 mm口径的LPF1-U中实现了4.2 K下12.47 T的主场，一种Nb_3Sn & NbTi组合共线圈结构的超导模型偶极磁体。在吸取LPF1系列磁体经验的基础上，设计、制造了16 T高场偶极磁体LPF3，并正在进行性能测试。LPF3也是一个组合磁体，外部有六个跑道形Nb3Sn线圈，预计在两个50 mm孔径内提供13 T的主磁场，并插入HTS线圈，以将磁场增强到16 T甚至更高。13-T Nb3Sn偶极磁体，名为LPF3-LTS，采用了分级共线圈配置，以提高超导体效率。线圈布局的优化包括改变弯曲半径（BR）和直线段长度（LSS），以分别减轻中心柱和线圈端部附近的外部四个线圈中的场积累。几个超过200米的卢瑟福电缆制造的线圈绕组，并与最大股数为42。LPF3-LTS的支撑结构采用了基于壳体的设计，并采用了改进的“气囊和钥匙”技术。研究了专用液压活塞，并利用其取代传统的囊。本文介绍了这种磁体的主要设计特点、制造工艺和初步试验结果。
R&D of high field accelerator magnets is ongoing at the Institute of High Energy Physics, Chinese Academy of Sciences (IHEP, CAS) for pre-study of the next-generation high energy colliders like Super Proton-Proton Collider (SPPC), Future Circular Collider (FCC) and etc. A 12.47-T main field at 4.2 K has been attained in 2021 within two 14-mm apertures of LPF1-U, a superconducting model dipole magnet with Nb3Sn & NbTi combined common-coil configuration. Based on the experiences mastered in the LPF1 series magnets, a 16-T high field dipole magnet named LPF3 has been designed, fabricated and is in the performance test process. LPF3 is also a combined magnet with six racetrack Nb3Sn coils outside, expected to provide a 13-T main field within two 50-mm apertures, and with inserted HTS coils to enhance the field up to 16 T or even higher. The 13-T Nb3Sn dipole magnet, named LPF3-LTS, incorporates a graded common-coil configuration to enhance superconductor efficiency. The optimization of coil layouts includes varying bending radii (BR) and lengths of straight sections (LSS) to mitigate field accumulation in the outer four coils near the central posts and coil ends, respectively. Several Rutherford cables over 200 meters were fabricated for the coils winding, and with the maximum strands count of 42. The support structure for LPF3-LTS has adopted a shell-based design, with an improved “Bladder & Key” technology. Dedicated hydraulic pistons were investigated and utilized to replace the traditional bladders. The main design characteristics, fabrication process and some preliminary test results of the magnet are presented in this paper.