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Mar 20 – 23, 2023
Campus Garching
Europe/Berlin timezone

Studying the effects of trapped magnetic fields on current flow in a multifilamentary YBCO superconductor using polarized neutron imaging.

Mar 22, 2023, 11:50 AM
MW 2 001 - Lecture hall (Fakultät für Maschinenwesen)

MW 2 001 - Lecture hall

Fakultät für Maschinenwesen

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Talk (17 + 3 min) Magnetism, Superconductivity, Topological Systems, Magnetic Thin Films an other electronic phenomena Superconductors


Cédric Qvistgaard (Technical University of Denmark (DTU - Energy))


This study aims to investigate the changes in superconducting current flow induced by a trapped magnetic field. This is done by using polarized neutrons to image both the trapped magnetic field and the screening field induced by the current flow.
The experiment was conducted at the J-PARC RADEN facility on a multifilamentary YBCO superconductor [1] with a 1T field applied along the current flow path, trapped at 5K. Measurements were performed both with and without an applied current of 1Amp.
Using polarized neutrons [2] the trapped field can be directly imaged, and by assuming a local unidirectional current flow, the current can be piece-wise reconstructed from the measured screening field.
The presentation will give an overview of the experiment along with data analysis procedures. As a result, the effect of screening currents on the current flow behavior and its response to a trapped magnetic field inside the current path, can be directly investigated for a better understanding of internal current flow in superconductors.

[1] Wulff, A. C., Abrahamsen, A. B., & Insinga, A. R. (2021). Multifilamentary coated conductors for ultra-high magnetic field applications. In Superconductor Science and Technology (34, 5). IOP Publishing Ltd. https://doi.org/10.1088/1361-6668/abee2b
[2] Takenao Shinohara et al 2017 J. Phys.: Conf. Ser. 862 012025

Primary author

Cédric Qvistgaard (Technical University of Denmark (DTU - Energy))


Anders C. Wulff (SUBRA A/S) Luise Theil Kuhn (DTU Energy, Technical University of Denmark) Morten Sales (Department of Physics, Technical University of Denmark) Søren Schmidt (European Spallation Source, Lund, Sweden) Takenao Shinohara (JPARC)

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