Alternating Current Losses in Twisted In-Situ Composite Wires
The purpose of this study was to experimentally compare ac losses and mechanical properties of twisted and untwisted in-situ formed composite wires. Our earlier work concentrated on untwisted in situ samples having remarkable mechanical properties, but rather high losses. It is known, however, that conventional composites must be twisted to achieve acceptably low losses. Twisting of in-situ wires could also be advantageous if mechanical properties were not degraded excessively. We will show that this degradation is, indeed, negligible but the loss reduction due to twisting is not large if the volume fraction of superconductor in the composite is well above the percolation threshold.
KeywordsPercolation Threshold Critical Current Density Full Penetration Eddy Current Loss Penetration Field
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