Field-Trapping Performance of Drilled MgB2 Bulk Superconductor Embedded With Bi-In-Sn Alloy and Al-Rod Using Pulse-Field Magnetization Processes
IEEE Transactions on Applied Superconductivity（2022）
摘要
The degrading of trapped fields
B
T
in bulk MgB
2
superconductor due to the occurrences of flux jumps was investigated. This work presents the method for characterizing the propagation of the magnetic flux in an artificially drilled MgB
2
bulk superconductor fabricated via spark plasma sintering (SPS). The pulsed field magnetization (PFM) was utilized by studying the effect of applied fields
B
A
on the bulk MgB
2
embedded with low melting alloy of Bi-In-Sn alloy and aluminum rods within the holes which improved the thermal property, thereby suppressing the flux jumps caused by the generated heat within the bulk sample. The bulk MgB
2
sample was redesigned to enhance both the thermal properties and to suppress flux jumps during pulse applications. We discuss the magnetic flux dissipation, the flux motion, and performance by evaluation of the capture field ratio
B
T
/
B
P
. We analyzed the field trapping performance of the improvised bulk at high applied fields and compared our findings to the data obtained for the as-received bulk sample for the penetration ratio
B
P
/
B
A
and penetrated field
B
p
. This study helps to solve the flux jump problem in the bulk superconductor resulting from poor heat dissipation. This is an experimental breakthrough that supports existing simulation studies and reports giving way for more prospects for high field applications in the development of bulk MgB
2
superconductors.
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关键词
Bulk magnet,flux jump,penetrated field,pulse-field magnetization,trapped field
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