AC loss properties of some Bi:2212/Ag Rutherford cables and a comparison with those of cables wound with NbTi and Nb3Sn
✍ Scribed by M.D. Sumption; R.M. Scanlan; E.W. Collings
- Book ID
- 104111566
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 208 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
Calorimetric measurements of AC loss have been performed on Rutherford cables wound with NbTi, Nb 3 Sn, and Bi:2212/Ag strands, respectively. For the NbTi cables, various strand coatings had been applied, while for the Nb 3 Sn and Bi:2212/Ag cables the strand surfaces were just bare Cu or Ag, respectively. Most of the cables contained resistive cores: ribbons of kapton or titanium (NbTi cables), stainless steel (NbTi and Nb 3 Sn cables), and nichrome-80 (Bi:2212/Ag cables). In all cases the cores were found to lead to a strong suppression of the face-on (field normal to the broad cable face) coupling current loss; to such an extent that even the Bi:2212/Ag cables, which would otherwise be severely cross-sintered, evinced acceptable coupling loss. For most of the cables side-by-side interstrand contact resistances have been calculated. An 'effective interstrand contact resistance', R -,eff , has been defined, and an expression devised to enable its value in different-size cables to be converted to that of a 'standard reference cable ', R -,eff.,ref. , for the purpose of intercomparison.