Record Details

An MgB2 Superconducting Joint with its own Heat-Treatment Schedule

Harvard Dataverse (Africa Rice Center, Bioversity International, CCAFS, CIAT, IFPRI, IRRI and WorldFish)

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Title An MgB2 Superconducting Joint with its own Heat-Treatment Schedule
 
Identifier https://doi.org/10.7910/DVN/U2IIEJ
 
Creator Hiromi Tanaka, Yi Li, Yoonhyuck Choi, Dongkeun Park, Wooseung Lee, Hideki Tanaka, Juan Bascuñàn, Yukikazu Iwasa
 
Publisher Harvard Dataverse
 
Description We suggested an MgB2 joint process with its own heat-treatment schedule to apply it for our 1.5-T MgB2 “finger” MRI magnet. In fabricating the MgB2 magnet, the optimal heat-treatment schedule to attain a reproducible and high critical current is different in a joint and a coil. To solve this problem, we introduced an additional heating system, which is composed of a cartridge heater and a thermocouple connected with a copper block, into a box-type furnace. Then, we carried out heattreatments with exclusively increasing the joint-part temperature above theMgmelting point of 645 °C—the jointwas actually heated up to 700 °C.We evaluated a critical current and a crystal structure of the obtained MgB2 joint. From experimental results, we found that the joint heated with the own heat-treatment schedule, which is 700 °C for 1 h+600°C for 11 h, showed a good Ic of over 450 A at 15K under self-field. The joint resistance was estimated by the coil operation for 18 days, and it was expected to be less than 10−12 Ω.
 
Subject Physics
AnMgB2
critical current
joint process
MRI magnet
the own heat-treatment schedule.