Jiang 2018 Dynamic resistance measurement of a four-tape YBCO.pdf (596.63 kB)
Download fileDynamic Resistance Measurement of a Four-Tape YBCO Stack in a Perpendicular Magnetic Field
journal contribution
posted on 2021-03-30, 02:51 authored by Zhenan JiangZhenan Jiang, W Zhou, Christopher BumbyChristopher Bumby, M Staines, Q Li, Rodney BadcockRodney Badcock, Nicholas LongNicholas Long, J FangDynamic resistance occurs when HTS (high-temperature superconductor) coated conductors carry dc current under ac magnetic field. This dissipative effect can play a critical role in many HTS applications. Here, we report on dynamic resistance measurements of a four-tape YBCO stack comprising 4-mm-wide coated conductors, which experience an applied ac perpendicular magnetic field with an amplitude of up to 100 mT. Each tape within the stack carries the same dc current. The magnetic field amplitude, the frequency of the magnetic field, and the dc current magnitude are varied to investigate the influence of these parameters on the dynamic resistance. We find that the threshold field of the stack is significantly larger than that of a single tape when dc current is small, which we attribute to coherent shielding effects from circulating currents present in each wire in the stack.
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