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Sudden-Discharging Quench Dynamics in a No-Insulation Superconducting Coil

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

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Title Sudden-Discharging Quench Dynamics in a No-Insulation Superconducting Coil
 
Identifier https://doi.org/10.7910/DVN/Z5PU6L
 
Creator Fangliang Dong, Dongkeun Park, Junseong Kim, Juan Bascuñán, Yukikazu Iwasa
 
Publisher Harvard Dataverse
 
Description It is generally agreed that no-insulation (NI) hightemperature superconducting (HTS) magnets do not quench because of the turn-to-turn energy-releasing bypass unique to NI. However, these magnets, especially with high operating current and low ambient thermal capacity, still occur unexpected quenches when the current through the magnets suddenly drops to zero (i.e., the sudden-discharging quench). Here, we report this kind of quench, which is different from that widely-reported quench happening during charging (i.e., the energizing quench). Here, a demonstrative coil with 655-turns, 350 A operating current, and 4 K conduction cooling, is used to prove this sudden-discharging quench, and a simulationmodel is built to reveal the quench dynamics. Results show the turn-to-turn heat triggers the initial partial quench in the inner coil turns and then the induced overcurrent spreads out the quench like an avalanche to the outer coil turns.
 
Subject Physics
hts magnet
induced overcurrent
No-insulation
quench.
sudden discharge
 
Date 2023-10-23