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引用次数: 0
摘要
对于单晶粒块状高温超导体（HTS）作为强困场磁体（TFM）的实际应用而言，操作磁化仍然是一个关键问题。之前的研究已经证明，利用脉冲磁场磁化（PFM）过程中的磁通跃迁可以提高磁化效率。在这项研究中，我们提出了一种新颖的脉冲场磁化序列，它结合了横向磁化和垂直磁化，即交叉场磁化。研究发现，最终的俘获磁场分布在很大程度上取决于横向磁场的方向，表现出手性特征。数值模拟揭示了垂直 PFM 期间感应电流的重新分布，这表明会涉及更强烈的磁通运动。因此，在 30 K 时，磁化块体所需的外部磁场减少了约 10%，磁化效率也得到了提高。
Crossed fields magnetization of YBCO single-grain bulk superconductors
Operando magnetization remains a critical issue for practical applications of single-grain bulk high temperature superconductors (HTSs) as strong trapped field magnets (TFMs). It has been previously proved that the magnetization efficiency can be improved by exploiting flux jumps during the pulsed field magnetization (PFM). In this study, we proposed a novel PFM sequence combining a transverse magnetization followed by a vertical magnetization namely the crossed fields magnetization. It was found the final trapped field distribution greatly depended on the direction of the transverse field exhibiting chirality features. Numerical simulation revealed the redistribution of the induced current during the vertical PFM indicating more intense flux motion will be involved. As a result, the external magnetic field required to magnetize the bulk was reduced by about 10 % at 30 K and the magnetization efficiency was improved.
期刊介绍：
Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are:
- Applications of superconductivity: magnets, electronics, devices
- Superconductors and their properties
- Properties of materials: metals, alloys, composites, polymers, insulations
- New applications of cryogenic technology to processes, devices, machinery
- Refrigeration and liquefaction technology
- Thermodynamics
- Fluid properties and fluid mechanics
- Heat transfer
- Thermometry and measurement science
- Cryogenics in medicine
- Cryoelectronics
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