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Fluorescent thermal imaging of a non-insulated pancake coil wound from high temperature superconductor tape

R. Gyuráki, T. Benkel, F. Schreiner, Frédéric Sirois and F. Grilli

Article (2019)

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Cite this document: Gyuráki, R., Benkel, T., Schreiner, F., Sirois, F. & Grilli, F. (2019). Fluorescent thermal imaging of a non-insulated pancake coil wound from high temperature superconductor tape. Superconductor Science and Technology, 32(10). doi:10.1088/1361-6668/ab38f2
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Abstract

We have wound a 157-turn, non-insulated pancake coil with an outer diameter of 85 mm and we cooled it down to 77 K with a combination of conduction and gas cooling. Using high-speed fluorescent thermal imaging in combination with electrical measurements we have investigated the coil under load, including various ramping tests and over-current experiments. We have found that the coil does not heat up measurably when being ramped to below its critical current. Two over-current experiments are presented, where in one case the coil recovered by itself and in another case a thermal runaway occurred. We have recorded heating in the bulk of the windings due to local defects, however the coil remained cryostable even during some over-critical conditions and heated only to about 82–85 K at certain positions. A thermal runaway was observed at the center, where the highest magnetic field and a resistive joint create a natural defect. The maximum temperature, ∼100 K, was reached only in the few innermost windings around the coil former.

Uncontrolled Keywords

pancake coil; non-insulated coil; thermal imaging; high temperature superconductors

Open Access document in PolyPublie
Subjects: 2500 Génie électrique et électronique > 2500 Génie électrique et électronique
Department: Département de génie électrique
Date Deposited: 10 May 2022 09:19
Last Modified: 11 May 2022 01:20
PolyPublie URL: https://publications.polymtl.ca/4914/
Document issued by the official publisher
Journal Title: Superconductor Science and Technology (vol. 32, no. 10)
Publisher: IOP Publishing Ltd
Official URL: https://doi.org/10.1088/1361-6668/ab38f2

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