Analysis of coupling losses in multifilamentary untwisted BSCCO/Ag tapes through a.c. susceptibility measurements

TL;DR

This study investigates the coupling losses in untwisted BSCCO/Ag tapes at 77 K using a.c. susceptibility measurements, analyzing how losses depend on sample length and coupling mechanisms.

Contribution

It provides a detailed analysis of coupling losses in BSCCO/Ag tapes, comparing experimental data with analytical models to better understand the coupling mechanisms involved.

Findings

Losses depend on sample length but are not solely due to coupling.

Experimental data can be explained by analytical models of coupling.

Different tape typologies show varied coupling behaviors.

Abstract

Losses as function of the a.c. magnetic field amplitude ($B_0$) were measured at 77 K in untwisted BSCCO(2223)/Ag tapes, at different frequencies, by measuring the imaginary part of the a.c. susceptibility. In particular, loss measurements were performed in the portions of the same tape, obtained by cutting it in pieces with different length, starting from around 12 cm down to 1 cm. The results show that the measured losses depend on the sample length but this observed behaviour is not always due to the coupling mechanism among the filaments. In this work we discuss the observed experimental behaviour of different typology of tapes by analysing data comparing them with analytical models in order to fully characterize the tapes with regard to the coupling mechanism.