Effect of partially reacting Nb{sub 3}Sn before magnet winding on the strand critical current

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Nb{sub 3}Sn is currently the material most commonly foreseen for the development of high field superconducting magnets. This is done by either the wind and react technique, usually used for compact magnets like accelerator magnets, or the react and wind technique, more common on large scale magnets. In both cases, a thorough understanding of the Cu-Sn system diffusion and phase formation processes is necessary to optimize the Nb{sub 3}Sn reaction cycle. Attention has to be paid to both the superconducting performance and the prevention of thermally induced damage of the final produced conductor. The formation of the eta and epsilon ... continued below

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735 Kilobytes pages

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al., J.M. Rey et August 24, 2001.

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Nb{sub 3}Sn is currently the material most commonly foreseen for the development of high field superconducting magnets. This is done by either the wind and react technique, usually used for compact magnets like accelerator magnets, or the react and wind technique, more common on large scale magnets. In both cases, a thorough understanding of the Cu-Sn system diffusion and phase formation processes is necessary to optimize the Nb{sub 3}Sn reaction cycle. Attention has to be paid to both the superconducting performance and the prevention of thermally induced damage of the final produced conductor. The formation of the eta and epsilon phases of the Cu-Sn phase diagram were investigated as a function of time and temperature. Wherever possible, the activation energies and diffusion coefficients were calculated. The feasibility of winding partly reacted cables to reduce the manufacturing time was also explored. Nb{sub 3}Sn strands have been partially reacted to convert the Sn to the eta and epsilon phases of the Cu-Sn phase diagram, then plastically strained to figure out a cabling and/or a winding degradation. After completion of the reaction cycle, the critical current was measured and compared with that obtained with an uninterrupted cycle.

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735 Kilobytes pages

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  • ICMC, Madison, WI (US), 07/17/2001--07/20/2001

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  • Report No.: FERMILAB-Conf-01/216-E
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 784995
  • Archival Resource Key: ark:/67531/metadc725222

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  • August 24, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 1, 2016, 3:58 p.m.

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al., J.M. Rey et. Effect of partially reacting Nb{sub 3}Sn before magnet winding on the strand critical current, article, August 24, 2001; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc725222/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.