DocumentCode :
67765
Title :
Analytical Formulation of 
Dependence on Torsion of YBCO and BSCCO Conductors
Author :
Fleiter, J. ; Sitko, M. ; Ballarino, A.
Author_Institution :
CERN, Geneva, Switzerland
Volume :
23
Issue :
3
fYear :
2013
fDate :
Jun-13
Firstpage :
8000204
Lastpage :
8000204
Abstract :
The behavior of HTS tapes under torsion is of key importance for the definition of the allowable twist during cabling activity. In this paper, we report on the elaboration of self-consistent analytical expressions of Ic dependence on twist pitch for YBCO and BSCCO (2223) conductors. The computed expressions are validated with the results of a series of tests performed at 77 K and in self-field with a purpose-built setup. The Ic was observed to be reduced to 95% of the unstrained value for twist pitches of 114 mm for BSCCO tapes, and 80-90 mm for YBCO tapes. The reduction of performance was identified to be caused mainly by irreversible degradation of Ic at the tapes edges. At lower temperatures, a slightly lower sensitivity to twist is expected.
Keywords :
barium compounds; bismuth compounds; calcium compounds; critical currents; high-temperature superconductors; strontium compounds; superconducting tapes; torsion; yttrium compounds; BSCCO Conductors; Bi2Sr2Can-1CunO2n+4+x; HTS tapes; YBCO; YBCO Conductors; analytical formulation; critical currents; irreversible degradation; self-consistent analytical expressions; temperature 77 K; torsion; twist pitch; Bismuth compounds; Conductors; Integrated circuits; Strain; Temperature measurement; Yttrium barium copper oxide; BSCCO; HTS; YBCO; torsion;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2012.2228292
Filename :
6353534
Link To Document :
