Demagnetization of a Bi-2223 high-temperature superconducting coil in RT-1 through spontaneous temperature rise |
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| Authors: | H. Saitoh Z. Yoshida Y. Ogawa J. Morikawa Y. Yano T. Mizushima S. Mizumaki T. Tosaka |
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| Affiliation: | 1. Forschungszentrum Jülich GmbH, Institut fuer Energie und Klimaforschung, Partner of the Trilateral Euregio Cluster (TEC), 52425 Juelich, Germany;2. Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany;3. Materials Science and Engineering, Texas A&M University, College Station, TX 77843, United States;4. Technische Universität München, Boltzmannstrasse 15, 85748 Garching, Germany |
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| Abstract: | The Ring Trap 1 (RT-1) device produces a magnetospheric configuration for the confinement of a high-β plasma with a Bi-2223 high-temperature superconducting magnet. Here we report the results of emergency demagnetization of the superconducting coil, where we could not connect current leads, temperature measurement connectors, and connectors for a persistent-current switch (PCS) heater to the coil. The spontaneous warming of the coil caused a rise in the flux-flow resistance of the superconducting coil, and the persistent current slowly decreased as coil resistance increased. Approximately 98% of the total stored magnetic energy was safely released before the quenching of the PCS, and there was no substantial damage to the superconducting coil. |
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