标题： CEE谱仪的大规模超导偶极磁铁设计 显示英文标题

标题： Design of a large-scale superconducting dipole magnet for the CEE spectrometer

摘要： CSR外部目标实验（CEE）是在兰州重离子研究设施（HIRFL）建设中的大型谱仪，用于研究高重子密度下核物质的相结构以及超饱和密度下核物质的状态方程。 其中一个关键部件是一个大接受度的二极磁铁，中心场强为0.5 T，在1米长、1.2米宽、0.9米高的孔径内均匀度为5%。 探测器将安装在这个孔径内。 提出了一种创新的超导探测器磁铁设计，超越了传统方法。 该磁铁设计为线圈主导型，导体在椭圆形截面上离散分布以产生必要的磁场。 使用一个温暖的铁芯来增强中心场强并最小化漏磁场。 磁铁的整体尺寸为长3.4米、高2.7米、宽4.3米。 线圈将使用由12根NbTi超导线和7根铜线组成的19股绳状电缆绕制。 电缆中铜与超导体的比例为6.9。 龙骨支撑件作为线圈的主要结构支撑，以承受电磁力。 线圈将通过三个外部氦容器内的液氦进行间接冷却。 为了确保磁铁在失超期间的可靠保护，采用了一种结合失超反向效应的主动保护方法。 本文主要介绍了谱仪磁铁的磁场、结构、失超保护和低温容器的详细设计。 显示英文摘要

摘要： The CSR External-target Experiment (CEE) is a large-scale spectrometer under construction at the Heavy Ion Research Facility in Lanzhou (HIRFL) for studying the phase structure of nuclear matter at high baryon density and the equation of states of nuclear matter at supra-saturation densities. One of the key components is a large acceptance dipole magnet with a central field of 0.5 T and the homogeneity of 5% within a 1 m long, 1.2 m wide, and 0.9 m high aperture. Detectors will be installed within this aperture. An innovative design for the superconducting detector magnet is proposed that goes beyond the conventional approach. The magnet is designed as a coil-dominant type, with conductors discretized on a racetrack-shaped cross-section to generate the necessary fields. A warm iron yoke is used to enhance the central field and minimize the stray field. The magnet has overall dimensions of 3.4 meters in length, 2.7 meters in height, and 4.3 meters in width. The coils will be wound using a 19-strand rope cable comprised of 12 NbTi superconducting wires and 7 copper wires. The ratio of copper to superconductor of the cable is 6.9. The keel supports serve as the primary structural support for the coils to withstand the electromagnetic force. The coils will be indirectly cooled by liquid helium within three external helium vessels. To ensure reliable protection of the magnet during a quench, an active protection method combined with quench-back effect is employed. In this paper, we mainly present the detailed design of the magnetic field, structure, quench protection and cryostat for the spectrometer magnet.