Abstract
Superconducting foams of YBa2Cu3Oy (YBCO) are proposed as trapped field magnets or supermagnets. The foams with an open-porous structure are light-weight, mechanically strong and can be prepared in large sample sizes. The trapped field distributions were measured using a scanning Hall probe on various sides of an YBCO foam sample after field-cooling in a magnetic field of 0.5 T produced by a square Nd-Fe-B permanent magnet. The maximum trapped field (TF) measured is about 400 G (77 K) at the bottom of the sample. Several details of the TF distribution, the current flow and possible applicatons of such superconducting foam samples in space applications, e.g., as active elements in flux-pinning docking interfaces (FPDI) or as portable strong magnets to collect debris in space, are outlined.
Highlights
Today, high-Tc superconductor samples are mainly fabricated in three different shapes: wires/tapes, thin films and bulk materials [1,2,3]
We present the results of trapped field measurements at 77 K on a superconducting large YBCO foam piece for the first time, as in a previous paper [23] only small foam pieces were measured
The trapped field (TF) measurements clearly demonstrate the presence of two types of currents in the foam sample – one current density, which is running through the entire sample perimeter, resulting in the large, cone-shaped maxima with Btrap,max, and one locally distributed current density being responsible for the small, sharp peaks
Summary
High-Tc superconductor samples are mainly fabricated in three different shapes: wires/tapes, thin films and bulk materials [1,2,3]. The foams have much less weight as compared to the bulks, and less material is required reducing the costs of a sample further These advantages make the superconducting foams ideal candidates for applications in space. This may comprise the flux-pinning docking interfaces (FPDI) discussed in the literature [18,19] and portable high-magnetic field units which can be mounted in satellites to magnetically collect waste debris [20,21,22] In this contribution, we present the results of trapped field measurements at 77 K on a superconducting large YBCO foam piece for the first time, as in a previous paper [23] only small foam pieces were measured. Several possible applications of such foam samples are discussed as well
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