The enhanced racetrack model coil and racetrack model magnet constitute the current R&D Nb3Sn magnets under development at CERN aiming to achieve dipole fields of 16-18 T, the design baseline of the Future Circular Collider (FCC). This article reports the mechanical behavior of their common support structure, which underwent three different levels of room-temperature preload (with the bladders and key method) and two cooldown cycles to 80 K. The structure was mounted using aluminum dummy blocks in lieu of the actual Nb3Sn coils. Strain gauges were placed in the external aluminum shell, tie-rods, and dummy coils. The measurements agree well with the results of the finite-element models (FEM). This work validates the FEM and a support structure for testing Nb3Sn accelerator magnets in the 16-T regime.

中文翻译：

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CERN FCC 研发中心 eRMC 和 RMM 磁体支撑结构的机械测试、分析和验证


增强型跑道模型线圈和跑道模型磁体构成了欧洲核子研究中心目前正在研发的 Nb3Sn 磁体，旨在实现 16-18 T 的偶极场，这是未来圆形对撞机 (FCC) 的设计基线。本文报告了其常见支撑结构的机械行为，该结构经历了三种不同级别的室温预载（使用气囊和关键方法）和两个冷却周期至 80 K。该结构使用铝制推力块安装，而不是实际 Nb3Sn 线圈。应变计放置在外部铝壳、拉杆和虚拟线圈中。测量结果与有限元模型 (FEM) 的结果非常吻合。这项工作验证了用于在 16-T 状态下测试 Nb3Sn 加速器磁体的 FEM 和支撑结构。