Trapped Fields >1 T in a Bulk Superconducting Ring by Pulsed Field Magnetization
Trapped Fields >1 T in a Bulk Superconducting Ring by Pulsed Field Magnetization
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通过脉冲场磁化在体超导环中捕获 >1 T 的场
DOI：
10.1109/tasc.2022.3160661
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发表时间：
2022
影响因子：
1.8
通讯作者：
M. Ainslie
中科院分区：
文献类型：
--
作者：
Yee Kin Tsui;Dominic Moseley;A. Dennis;Yunhua Shi;Michael Beck;V. Cientanni;D. Cardwell;J. Durrell;M. Ainslie
磁化的RE-Ba-Cu-O（其中RE =稀土或Y）块体超导体的一个潜在应用是在台式NMR和MRI系统中作为常规永磁体的高场替代物。脉冲磁场磁化（PFM）是最有前途的实用磁化方法之一。然而，通过PFM获得的捕获场远低于使用准静态方法如场冷却磁化（FCM），由于在PFM期间加热。此外，大块超导环已被证明比盘更难以通过PFM磁化。由于热磁不稳定性，在PFM磁化的单块超导环中，所报道的俘获场在孔中心处小于0.35T。在这项工作中，对块体Gd-Ba-Cu-O环进行了系统的PFM测量，并使用多脉冲分步冷却（MPSC）方法在55 K下获得了1.3 T的俘获场。在MPSC方法中，使用脉冲场序列来磁化环形体。脉冲场以小的增量增加，样品温度依次降低。因此，由于在第一个脉冲之后已经捕获了一些场，因此后续脉冲的通量运动将减少，从而导致在批量样品中产生更少的热。这大大提高了PFM工艺的热磁稳定性，从而实现更大的捕获场。
One potential application of magnetized RE-Ba-Cu-O (where RE = rare earth or Y) bulk superconductors is as a high-field alternative to conventional permanent magnets in desktop NMR and MRI systems. Pulsed field magnetization (PFM) is one of the most promising practical methods of magnetizing such bulks. However, the trapped fields obtained by PFM are much lower than those obtained using quasi-static methods like field-cooling magnetization (FCM) due to heating during PFM. Furthermore, bulk superconducting rings have proved more difficult to magnetize via PFM than discs. The reported trapped fields in single bulk superconducting rings magnetized by PFM are less than 0.35 T at the centre of the bore due to thermomagnetic instabilities. In this work, systematic PFM measurements on a bulk Gd-Ba-Cu-O ring were carried out and a trapped field of 1.3 T at 55 K was achieved using a multi-pulse, stepwise cooling (MPSC) method. In the MPSC method, a sequence of pulsed fields is used to magnetize the ring bulk. The pulsed field is increased in small increments and the sample temperature is decreased sequentially. Consequently, as some field is already trapped after the first pulse, the motion of the flux for subsequent pulses will be reduced, leading to less heat generated in the bulk sample. This greatly improves the thermomagnetic stability of the PFM process, enabling larger trapped fields.
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DOI：
10.17863/cam.71334
发表时间：
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期刊：
--
影响因子：
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作者：
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