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首页> 外文期刊>Cryogenics >Experimental investigation of AC loss in a conduction-cooled layer-wound (RE)BCO magnet for continuous Adiabatic Demagnetization Refrigerator (ADR)
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Experimental investigation of AC loss in a conduction-cooled layer-wound (RE)BCO magnet for continuous Adiabatic Demagnetization Refrigerator (ADR)

机译：连续绝热去磁冰箱（ADR）的传导冷却层绕（RE）BCO磁体中AC损耗的实验研究

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摘要

This paper discusses the fabrication of a (RE)BCO solenoid magnet and its experimental results from the aspect of AC loss and thermal characteristics. A (RE)BCO coated conductor with polyimide tape insulation was utilized for a coil and wound by a standard layer-wound method. The (RE)BCO solenoid magnet consists of a stainless steel bore and a pair of OFHC copper supporting plates assembled at both ends. The coil winding has a novel thermal drain structure that can withstand high AC thermal loads generated externally and internally. The OFHC copper strips were installed between the interlayers in the perpendicular direction to the (RE)BCO conductor winding to mitigate both thermal resistance in the axial direction of the (RE)BCO coil and eddy current loss by an external magnetic field. Apiezon~R N grease with hexane solution was applied on the entire (RE)BCO coil winding to minimize thermal contact resistance between the conductor and the OFHC copper strips. The (RE)BCO coil carried 150 A at 14.7 K and generated 3.5 T at the center of the coil. A sinusoidal current waveform (operating frequency from 0.1 Hz to 1.0 Hz) was applied with peaks of 25 A, 50 A, and 70 A (the corresponding magnetic field of 0.54 T, 1.08 T, and 1.54 T) and the corresponding AC losses were measured by both calorimetric and electrical methods. The AC losses measured by both methods were in good agreement. The experimental results were compared with theoretical and numerical solutions.
机译：本文从交流损耗和热特性的角度讨论了（RE）BCO电磁线圈的制造及其实验结果。将具有聚酰亚胺胶带绝缘层的（RE）BCO涂层导体用于线圈，并通过标准层绕方法进行缠绕。 （RE）BCO电磁线圈由一个不锈钢孔和两个在两端组装的OFHC铜支撑板组成。线圈绕组具有新颖的散热结构，可以承受外部和内部产生的高交流热负荷。在与（RE）BCO导体绕组垂直的方向上，将OFHC铜带安装在中间层之间，以减轻（RE）BCO线圈轴向的热阻和外部磁场引起的涡流损耗。将具有己烷溶液的Apiezon〜R N润滑脂涂在整个（RE）BCO线圈绕组上，以最小化导体与OFHC铜带之间的热接触电阻。 （RE）BCO线圈在14.7 K时承载150 A的电流，在线圈中心产生3.5 T的电流。施加正弦电流波形（工作频率从0.1 Hz到1.0 Hz），峰值为25 A，50 A和70 A（相应的磁场为0.54 T，1.08 T和1.54 T），并且相应的AC损耗为通过量热法和电法测量。两种方法测得的交流损耗非常吻合。将实验结果与理论和数值解进行了比较。

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