Transport and Magnetization Properties of rolled RRP Nb3Sn Strands.

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Restack Rod Process (RRP) strands with 54 and 108 sub-elements were rolled from 0.7 mm diameter to 0.45 mm thickness to simulate the deformation of strands at the edges of Rutherford cables. Various diagnoses were then applied to assess performance and stability. Transport measurements were used to assess the effect of rolling on the critical current. Magnetization measurements were used to probe superconducting pathway bridging between deformed sub-elements. The copper residual resistivity ratio RRR was also measured to assess tin contamination due to thinned or ruptured diffusion barriers. While systematic changes were observed in all three measurements with increasing deformation, ... continued below

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Ghosh,A.K.; Cooley, L.D.; Dietderich, D.R. & Sun, L. August 27, 2007.

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Restack Rod Process (RRP) strands with 54 and 108 sub-elements were rolled from 0.7 mm diameter to 0.45 mm thickness to simulate the deformation of strands at the edges of Rutherford cables. Various diagnoses were then applied to assess performance and stability. Transport measurements were used to assess the effect of rolling on the critical current. Magnetization measurements were used to probe superconducting pathway bridging between deformed sub-elements. The copper residual resistivity ratio RRR was also measured to assess tin contamination due to thinned or ruptured diffusion barriers. While systematic changes were observed in all three measurements with increasing deformation, RRR showed the strongest changes. The implications of these measurements for cable stability, and their relationship to observations of the strand cross-section by light microscopy, are discussed.

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  • 20th International Conference on Magnet Technology (MT20); Philadelphia, PA; 20070827 through 20070831

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  • Report No.: BNL--79837-2008-CP
  • Grant Number: DE-AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 924433
  • Archival Resource Key: ark:/67531/metadc895623

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  • August 27, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 1, 2016, 5:12 p.m.

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Ghosh,A.K.; Cooley, L.D.; Dietderich, D.R. & Sun, L. Transport and Magnetization Properties of rolled RRP Nb3Sn Strands., article, August 27, 2007; United States. (digital.library.unt.edu/ark:/67531/metadc895623/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.