Correlation between Strand Stability and Magnet Performance

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Magnet programs at BNL, LBNL and FNAL have observed instabilities in high J{sub c} Nb{sub 3}Sn strands and magnets made from these strands. This paper correlates the strand stability determined from a short sample-strand test to the observed magnet performance. It has been observed that strands that carry high currents at high fields (greater than 10T) cannot sustain these same currents at low fields (1-3T) when the sample current is fixed and the magnetic field is ramped. This suggests that the present generation of strand is susceptible to flux jumps (FJ). To prevent flux jumps from limiting stand performance, one ... continued below

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Dietderich, Daniel R.; Bartlett, Scott E.; Caspi, Shlomo; Ferracin, Paolo; G ourlay, Stephen A.; Higley, Hugh C. et al. April 16, 2005.

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Magnet programs at BNL, LBNL and FNAL have observed instabilities in high J{sub c} Nb{sub 3}Sn strands and magnets made from these strands. This paper correlates the strand stability determined from a short sample-strand test to the observed magnet performance. It has been observed that strands that carry high currents at high fields (greater than 10T) cannot sustain these same currents at low fields (1-3T) when the sample current is fixed and the magnetic field is ramped. This suggests that the present generation of strand is susceptible to flux jumps (FJ). To prevent flux jumps from limiting stand performance, one must accommodate the energy released during a flux jump. To better understand FJ this work has focused on wire with a given sub-element diameter and shows that one can significantly improve stability by increasing the copper conductivity (higher residual resistivity ratio, RRR, of the Cu). This increased stability significantly improves the conductor performance and permits it to carry more current.

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  • Applied Superconductivity Conference,Jacksonville, FL, Oct 3-8, 2004

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  • Report No.: LBNL--56382
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 886978
  • Archival Resource Key: ark:/67531/metadc892679

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 16, 2005

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  • Sept. 23, 2016, 2:42 p.m.

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  • Sept. 21, 2017, 7:10 p.m.

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Dietderich, Daniel R.; Bartlett, Scott E.; Caspi, Shlomo; Ferracin, Paolo; G ourlay, Stephen A.; Higley, Hugh C. et al. Correlation between Strand Stability and Magnet Performance, article, April 16, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc892679/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.