NB3SN AND NbTi MULTIFILAMENTARY WIRES WITH ENHANCED HEAT CAPACITY

• Published in: Advances in Cryogenic Engineering Materials, Volume 54 (AIP Conference Proceedings Volume 986) Vol. 986; pp. 349 - 358
• Main Authors: Potanina, L V, Shikov, A K, Vorobieva, A E, Salunin, N I, Medvedev, M I, Keilin, V E, Kovalev, I A, Kruglov, S L
• Format: Journal Article
• Language: English
• Published: 01.01.2008
• ISBN: 9780735405059; 0735405050
• ISSN: 0094-243X
• DOI: 10.1063/1.2900366

ITER type multifilamentary superconducting wires (0.82 mm Nb3Sn wire and 0.73 mm NbTi wire) with high heat capacity at LHe temperatures have been manufactured and tested. To increase the heat capacity the corresponding billets were doped with several volume fractions of PrB6 (for Nb3Sn) and Gd2O2S (for NbTi). The volumetric heat capacity of these substances at LHe temperatures is about two orders of magnitude larger than that for the other components of the wires. Fine powders of PrB6 and Gd2O2S were incorporated into the billets by the Powder-in-Tube (PIT) method. For comparison the wires without dopants were produced from the same billets using identical heat treatment for each pair of wires. First comparative tests of the wires have demonstrated a noticeable increase of critical energies in a wide range of transport currents. The ways of further increase of critical energies are considered.