Improved pulsed field magnetisation in MgB 2 trapped-field magnets
Improved pulsed field magnetisation in MgB 2 trapped-field magnets
复制标题
改善 MgB 2 陷场磁体中的脉冲场磁化强度
DOI：
10.1088/1361-6668/ac0951
复制
发表时间：
2021
影响因子：
3.6
通讯作者：
Moseley D
中科院分区：
文献类型：
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作者：
Moseley D
块状超导体可以作为俘获场磁体，有可能用于许多应用，如便携式医用磁体系统和旋转机械。最大化俘获场，特别是对于诸如脉冲场磁化(PFM)这样的实用磁化技术来说，仍然是一个挑战。PFM是一个动态过程，在这个过程中，磁场在几毫秒内被驱动到超导块体中。这种磁通运动导致加热，并在磁和热性质之间产生复杂的相互作用。本文研究了MgB2大块超导体在PFM过程中的局域磁通密度。我们发现，改进冷却结构提高了磁通捕获能力，并改变了PFM过程中的磁通运动。这些改进导致了由螺线管脉冲场磁体磁化的单个MgB2块体样品的最大俘获场(0.95T)。这些发现说明了整体冷却在PFM过程中所起的基本作用。
Bulk superconductors can act as trapped-field magnets with the potential to be used for many applications such as portable medical magnet systems and rotating machines. Maximising the trapped field, particularly for practical magnetisation techniques such as pulsed field magnetisation (PFM), still remains a challenge. PFM is a dynamic process in which the magnetic field is driven into a superconducting bulk over milliseconds. This flux motion causes heating and a complex interplay between the magnetic and thermal properties. In this work, the local flux density during PFM in a MgB 2 bulk superconductor has been studied. We find that improving the cooling architecture increases the flux trapping capabilities and alters the flux motion during PFM. These improvements lead to the largest trapped field (0.95 T) for a single MgB 2 bulk sample magnetised by a solenoidal pulsed field magnet. The findings illustrate the fundamental role bulk cooling plays during PFM.