Actions for Magnetization, Low Field Instability and Quench of RHQT Nb(3)Al Strands [electronic resource].

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Magnetization, Low Field Instability and Quench of RHQT Nb(3)Al Strands [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2009.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
Fermi National Accelerator Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Since 2005, we made and tested three RHQT Nb₃Al strands, one with Nb matrix and two with Ta matrix, which are fully stabilized with Cu electroplating. We observed anomalously large magnetization curves extending beyond 1 to 1.5 Tesla with the F1 Nb matrix strand at 4.2 K, when we measured its magnetization with a balanced coil magnetometer. This problem was eliminated with the Ta matrix strands operating at 4.2 K. But with these strands a similar but smaller anomalous magnetization was observed at 1.9 K. We studied these phenomena with FEM. With the F1 Nb matrix strand, it is explained that at low external field, inter-filamentary coupling currents in the outer layers of sub-elements create a shielding effect. It reduces the inside field, keeps the inside Nb matrix superconductive, and stands against a higher outside field beyond the Hc of Nb. At an even higher external field, the superconductivity of the whole Nb matrix collapses and releases a large amount of energy, which may cause a big quench. Depending on the size of the energy in the strand or the cable, a magnet could quench, causing the low field instability. Some attempt to analyze the anomaly with FEM is presented.
Report Numbers
E 1.99:fermilab-conf-08-580-td
fermilab-conf-08-580-td
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Note
Published through SciTech Connect.
01/01/2009.
"fermilab-conf-08-580-td"
IEEE Trans.Appl.Supercond.19:2477-2480,2009
Prepared for Applied Superconductivity Conference (ASC 2008), Chicago, Illinois, 17-22 Aug 2008.
Yamada, R.; Kikuchi, A.; Wake, M.; Velev, V.
Funding Information
AC02-07CH11359
View MARC record | catkey: 14677146