Development of Bi(2223) Multifilamentary Tapes with Low ac Losses

Article Article scientifique Article Development of Bi(2223) Multifilamentary Tapes with Low ac Losses eng 1998 author Huang Yibing 108464 author Dhalle Marc 111389 author Witz Grégoire 62446 author Marti Frank 42274 author Giannini Enrico 0000-0003-3536-4771 503364 author Walker Eric 24664 author Passerini Reynald 503597 author Polcari Albino 504026 author Clerc S. author Kwasnitza K. author Flukiger René-Louis 25218 495-505 10.1023/A:1022662607835 0896-1107 http://link.springer.com/10.1023/A:1022662607835 A significant reduction of ac losses in twisted Bi(2223) multifilamentary tapes with Ag sheaths has been achieved by using oxide (BaZrO₃ and SrZrO₃) barriers between filaments. These barriers have two important effects: they increase the transverse resistivity, which suppresses induced coupling currents, and they reduce filament bridging, which in pure Ag sheath tapes largely cancels the beneficial effect of filament twisting. The decoupling can be gauged by the frequency at which loss shows a maximum in a low-amplitude ac field applied perpendicular to the tape. So far, the frequency of the loss maximum, fm, in Ag-sheathed tapes has been enhanced from 5 Hz (untwisted) to 82 Hz (11 mm in twist pitch length). Different ways to introduce oxide barriers in tapes with 19–95 filaments are presented. The critical current density in the filaments varied between 10,000 and 20,000 A/cm². Ac loss measurements as well as the electrical and mechanical characterization are discussed in detail. The variation of the critical current density with bending strain is shown to be similar to that of tapes without barriers. Oxide barrier Ac losses Mechanical property Bi(2223) tape Fabrication Dewey 500.2 33 Département de physique de la matière quantique 131 35 Groupe de physique appliquée 135 false Journal of Superconductivity 11 5 97bdb58e-6e2a-42c5-8962-a0ee1d06c1be Article (Published version) Public Huang1998_Article_DevelopmentOfBi2223Multifilame.pdf 2968181 application/pdf OA OTHER openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique Faculté des sciences / Section de physique / Groupe de physique appliquée

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Formation, caractérisation et propriétés mécaniques sous contrainte uniaxiale du Bi,Pb(2223) dans les rubans à gaine d'argent		2002	955	530
Development of Bi(2223) Multifilamentary Tapes with Low ac Losses	Journal of Superconductivity	1998	590	252

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Passerini, Reynald