The ATLAS Experiment at LHC, CERN will utilize a large, superconducting, air-cored toroidal magnet system with a long Barrel Toroid and two End Cap Toroids. Each End Cap Toroid will contain eight racetrack coils mounted as a single cold mass in a cryostat vessel of approximately 10 m diameter and 5 m width. The toroids provide the magnetic field for the muon detectors. The operating current is 20.5 kA at 0.25 GJ stored energy and a peak field of 4.1 T in the windings. This paper presents the status of the End Cap Toroid Project. Cold mass assembly and the integration of the full cold mass, 120 tons, into the vacuum cryostat for the first toroid are described. The specialized techniques, procedures and tooling infrastructure required for these operations are explained. The pre-installation cooldown to 77 K at the ATLAS cryogenic test facility is reported and the toroid installation in the ATLAS Experiment 100m underground in the ATLAS cavern will be reviewed.
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机译：位于欧洲核子研究中心（CHC）LHC的ATLAS实验将利用大型超导空芯环形磁石系统，该系统带有一个长桶形环形线圈和两个端盖环形线圈。每个End Cap环形线圈将包含八个跑道线圈，它们作为单个冷块安装在直径约10 m，宽度约5 m的低温恒温器容器中。环形线圈为μ子探测器提供了磁场。在0.25 GJ的存储能量和绕组中4.1 T的峰值磁场下，工作电流为20.5 kA。本文介绍了End Cap Toroid项目的状态。描述了冷块组装以及将完整的120吨冷块整合到第一个环形真空减压器中的情况。说明了这些操作所需的专门技术，过程和工具基础结构。据报道，ATLAS低温测试设施的安装前冷却时间为77 K，并且将审查ATLAS洞穴地下100 m ATLAS实验的环形安装。
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