Experimental realization of an all-(RE)BaCuO hybrid trapped field magnet lens generating a 9.8 T concentrated magnetic field from a 7 T external field
Publication Date
2021Journal Title
Superconductor Science and Technology
ISSN
0953-2048
Publisher
IOP Publishing
Volume
34
Issue
5
Language
en
Type
Other
This Version
VoR
Metadata
Show full item recordCitation
Takahashi, K., Fujishiro, H., Namba, S., & Ainslie, M. (2021). Experimental realization of an all-(RE)BaCuO hybrid trapped field magnet lens generating a 9.8 T concentrated magnetic field from a 7 T external field. [Other]. https://doi.org/10.1088/1361-6668/abeb01
Abstract
<jats:title>Abstract</jats:title>
<jats:p>In this work, we have verified experimentally an all-(RE)BaCuO hybrid trapped field magnet lens (HTFML) using only one cryocooler and a special technique named the ‘loose contact method’. In the experimental setup, only the inner magnetic lens was tightly connected to the cold stage and cooled at all times, and the outer trapped field magnet (TFM) cylinder was loosely connected to the cold stage before the magnetizing process by introducing a gap between the outer TFM and cold stage of the cryocooler. As a result, the superconducting state for zero-field cooled magnetization of the inner magnetic lens and the non-superconducting (normal) state for field-cooled magnetization of the outer TFM cylinder can co-exist at the same time. A maximum concentrated field of <jats:italic>B</jats:italic>
<jats:sub>c</jats:sub> = 9.8 T was achieved for the magnetizing process with an applied field of <jats:italic>B</jats:italic>
<jats:sub>app</jats:sub> = 7 T in the present HTFML, consistent with the numerical estimation in our previous conceptual study. These results validate the HTFML concept as a compact and desktop-type magnet device that can provide 10 T-class magnetic field enhancement from the viewpoint of the magnetizing method. However, during magnetization with a higher <jats:italic>B</jats:italic>
<jats:sub>app</jats:sub> of 10 T, thermal instability of the outer stacked TFM cylinder caused flux jumps to occur, resulting in mechanical fracture of multiple bulks. These results suggest that the further development of a practical cooling method that can realize a stable and controllable cooling process for each part of the HTFML is necessary based on fundamental studies relating to the thermal stability of the large stacked TFM cylinder.</jats:p>
Keywords
Letter, hybrid trapped field magnet lens, bulk superconductors, trapped field magnets, magnetic lens, vortex pinning effect, magnetic shielding effect, loose contact method
Sponsorship
- JSPS KAKENHI Grant No. 19K05240;
- Adaptable and Seamless Technology transfer Program through Target-driven R&D (A-STEP) from Japan Science and Technology Agency (JST), Grant Nos. VP30218088419 and JPMJTM20AK;
- Engineering and Physical Sciences Research Council (EPSRC) Early Career Fellowship, EP/P020313/1
Funder references
Engineering and Physical Sciences Research Council (EP/P020313/1)
Identifiers
sustabeb01, abeb01, sust-104307.r1
External DOI: https://doi.org/10.1088/1361-6668/abeb01
This record's DOI: https://doi.org/10.17863/CAM.80917
Rights
Licence:
http://creativecommons.org/licenses/by/4.0
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