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Reduced filament coupling in Bi(2223)/BaZrO3/Ag composite tapes |
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| Authors: | M Dhall A Polcari F Marti G Witz Y B Huang R Flü kiger St Clerc and K Kwasnitza |
| Institution: | a Département de Physique de la Matière Condensée, Université de Genève, CH-1211 Geneva, Switzerland b Paul Scherrer Institute, CH-5323 Villigen, Switzerland |
| Abstract: | Multifilamentary Bi(2223)/Ag tapes often exhibit AC loss levels comparable to those measured in monofilamentary samples, which is partly due to the large coupling currents induced in the low resistive sheath material. Surrounding the individual filaments by electrically insulating barrier layers suppresses these currents and strongly reduces the coupling. We demonstrate this effect with various types of magnetic and self-field AC loss measurements on a series of Bi(2223)/BaZrO3/Ag tapes. We also discuss the influence of barrier thickness, twist pitch length and filament arrangement on the measured losses in these composite conductors. |
| Keywords: | Transport AC loss Bi-2223 tape Resistive barrier Twist Filament geometry Coupling current BaZrO3 |
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