Summary
This paper addresses flux jump instabilities in high-critical-current Nb₃Sn conductors by investigating the application of ferromagnetic layers to suppress these low-field phenomena that prematurely quench superconducting coils. Through experimental and theoretical investigation of Nb₃Sn/ferromagnetic hybrid wires, the authors identify two competing stabilisation mechanisms: thermal suppression dominates at lower field-ramping rates, whilst both thermal and electromagnetic effects contribute at higher rates. The findings suggest ferromagnetic layer engineering as a practical approach to improve the performance and reliability of high-field superconducting magnets.
UK applicability
This superconductivity materials research has limited direct applicability to UK agricultural and food systems. It may have indirect relevance only if applied superconductor development for energy infrastructure (e.g. fusion reactors or grid applications) is considered within a broader food-systems sustainability context.
Key measures
Flux jump suppression in Nb₃Sn hybrid wires; thermal and electromagnetic effects; magnetic field-ramping rate dependency
Outcomes reported
The study experimentally and theoretically investigated flux jumps in Nb₃Sn/ferromagnetic hybrid wires exposed to magnetic field loops, comparing their performance against bare Nb₃Sn and Nb₃Sn/Cu wires. The research identified thermal and electromagnetic mechanisms by which ferromagnetic layers suppress flux jumps at different field-ramping rates.
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