A trapped field of 17.7 T in a stack of high temperature superconducting tape

Abstract

High temperature superconducting (HTS) tape can be cut and stacked to generate large magnetic fields at cryogenic temperatures after inducing persistent currents in the superconducting layers. A field of 17.7 T was trapped between two stacks of HTS tape at 8 K with no external mechanical reinforcement. 17.6 T could be sustained when warming the stack up to 14 K. A new type of hybrid stack was used consisting of a 12 mm square insert stack embedded inside a larger 34.4 mm diameter stack made from different tape. The magnetic field generated is the largest for any trapped field magnet reported and 30% greater than previously achieved in a stack of HTS tapes. Such stacks are being considered for superconducting motors as rotor field poles where the cryogenic penalty is justified by the increased power to weight ratio. The sample reported can be considered the strongest permanent magnet ever created.

9 pages, 10 figures

References in corpus (2)

• A Trapped Field of 17.6 T in Melt-Processed, Bulk Gd-Ba-Cu-O Reinforced with Shrink-Fit Steel
• Superconducting Bulk Magnets: Very High Trapped Fields and Cracking

Cited by in corpus (6)

• Grain boundary characteristics of Fe-based superconductors
• Composite stacks for reliable > 17 T trapped fields in bulk superconductor magnets
• Time constant of the cross field demagnetization of superconducting stacks of tapes
• Modeling cross-field demagnetization of superconducting stacks and bulks for up to 100 tapes and 2 million cycles
• Trapping a magnetic field of 14.8 T using stacked coated conductors of 12 mm width
• Measurement of critical current flow and connectivity in systems of joined square superconducting plates