The Barrel Toroid magnet of the ATLAS experiment will be built from eight 25 m x 5 m racetrack shaped superconducting coils that are symmetrically placed around the central axis of the detector. Prior to their final assembly in the underground cavern of the LHC, these magnets are individually tested at ground level in order to verify the expected overall performances. A dedicated facility has been commissioned and the testing of the coils, at their nominal electrical and thermal operating conditions, has been carried out. The paper presents the results obtained during the cool-down phase from ambient temperature, the steady-state operation at 4.5 K, the 20Â kA current ramping up/down and the thermal recovery after a fast energy dump of up to 138Â MJ stored energy. Included are the measurements of the various thermal loads in both static and dynamic conditions.
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机译：ATLAS实验的桶形环形磁体将由八个25 m x 5 m跑道形超导线圈构建而成，这些线圈围绕检测器的中心轴对称放置。在最终组装到大型强子对撞机的地下洞穴中之前，应对这些磁体在地面进行单独测试，以验证预期的总体性能。已经调试了专用设备，并且已经在标称的电气和热运行条件下对线圈进行了测试。本文介绍了在冷却阶段从环境温度，4.5 K的稳态运行，20 kA电流斜坡上升/下降以及快速能量消耗高达138 MJ存储能量后的热恢复期间获得的结果。包括静态和动态条件下各种热负荷的测量值。
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