A new ring-shape high-temperature superconducting trapped-field magnet
A new ring-shape high-temperature superconducting trapped-field magnet
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DOI：
10.1088/1361-6668/aa7a51
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发表时间：
2017-08
影响因子：
3.6
通讯作者：
J. Sheng;Min Zhang;Yawei Wang;Xiaojian Li;Jay Patel;W. Yuan
中科院分区：
文献类型：
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作者：
J. Sheng;Min Zhang;Yawei Wang;Xiaojian Li;Jay Patel;W. Yuan
本文提出了一种由第二代高温超导（2G HTS）环制成的新型陷场磁体。这种所谓的环形 2G HTS 磁体有可能提供比现有永磁体更强的磁场。与现有的 2G HTS 陷场磁体相比，例如2G HTS块体和堆叠，这种新型环形2G HTS磁体尺寸更加灵活，可以制成大尺寸磁体用于工业应用。有效的磁化是能够使用陷场磁体的关键。因此，本文重点采用实验和数值方法研究这种新型磁体的磁化机制。这种新型高温超导磁体在场冷却和零场冷却过程中的独特特征已被识别和量化。磁化机制可以通过屏蔽电流与外部磁场的穿透之间的相互作用来理解。通过使用多脉冲场冷却观察到捕获场中的积累。研究了三种类型的退磁，以测量实际应用中的俘获场衰减。我们的结果表明，这种新型环形高温超导磁体在捕获高磁场方面非常有前景。作为一种超永磁体，它将对大规模工业应用产生重大影响，例如：开发具有极高功率密度的高温超导机器和高温超导磁共振成像设备。
This paper presents a new trapped-field magnet made of second-generation high-temperature superconducting (2G HTS) rings. This so-called ring-shape 2G HTS magnet has the potential to provide much stronger magnetic fields relative to existing permanent magnets. Compared to existing 2G HTS trapped- field magnets, e.g. 2G HTS bulks and stacks, this new ring-shape 2G HTS magnet is more flexible in size and can be made into magnets with large dimensions for industrial applications. Effective magnetization is the key to being able to use trapped-field magnets. Therefore, this paper focuses on the magnetization mechanism of this new magnet using both experimental and numerical methods. Unique features have been identified and quantified for this new type of HTS magnet in the field cooling and zero field cooling process. The magnetization mechanism can be understood by the interaction between shielding currents and the penetration of external magnetic fields. An accumulation in the trapped field was observed by using multiple pulse field cooling. Three types of demagnetization were studied to measure the trapped-field decay for practical applications. Our results show that this new ring-shape HTS magnet is very promising in the trapping of a high magnetic field. As a super-permanent magnet, it will have a significant impact on large-scale industrial applications, e.g. the development of HTS machines with a very high power density and HTS magnetic resonance imaging devices.