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FSU reports on CERN/CDP Wires: pmm130723-1, pmm130723-2 and pmm130723-3

FSU reports on CERN/CDP Wires: pmm130723-1, pmm130723-2 and pmm130723-3. Jianyi Jiang, Maxime Matras, Natanette Craig, Erin Flagler, Eric Hellstrom, and David Larbalestier 12/12/2013. Outline. Powder densification (100bar/821  C/12h) for filling factor (FF) and cross section area

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FSU reports on CERN/CDP Wires: pmm130723-1, pmm130723-2 and pmm130723-3

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  1. FSU reports on CERN/CDP Wires: pmm130723-1, pmm130723-2 and pmm130723-3 Jianyi Jiang, Maxime Matras, Natanette Craig, Erin Flagler, Eric Hellstrom, and David Larbalestier 12/12/2013

  2. Outline • Powder densification (100bar/821C/12h) for filling factor (FF) and cross section area • 100 bar OP-fully HT for JE and JC • Analysis of “hard particles”

  3. Billets info This HT fully densifies the wire before melting, giving an easily digitized cross-section with which to normalize Ic to get a true Jc in the 2212, assuming no change of cross-section on melting. We have found that this density is >95%.

  4. PMM-130723-1 (Densified at 821C/12h/100bar, P45-01) PMM-130723-1 (Densified at 821C/12h/100bar, P45-02) Higher fill factor (28%) in the regular powder billet due to choice of thinner Ag tubes

  5. PMM-130723-2 (Densified at 821C/12h/100bar, P47-01) PMM-130723-2 (Densified at 821C/12h/100bar, P47-02) Lower fill factor (22%) in the granulate billets due to choice of thicker Ag tubes

  6. PMM-130723-3 (Densified at 821C/12h/100bar, P51-01 PMM-130723-3 (Densified at 821C/12h/100bar, P51-2 Very close fill factor (22-23%) to the large size granulate. Clunkers are visible.

  7. Ic, JE and Jc of 100 bar OP samples Note that Ic is not a good indication of quality due to the high FF of the standard powder billet. The best billet is billet 2 that OST found to have lowest hard particle count. Note that the best VHFSMC billets made with earlier Nexans granulate achieved over 400 A after OP in this architecture.

  8. Connecting FSU 5 T and OST 12 T data – we use a master normalized plot of Jc(H) that we have developed (5 T/12 T) enhancement factor: 1.25 One recent data set taken on 4 architectures by Dima Abraimov, Natanette Craig and Jianyi Jiang on 100 bar densified wires made by OST The best OST VHFMSC wires had about 4000 A/mm2 at 5 T.

  9. Big particle with Bi-2212 composition PMM-130723-3 (powder lot: 8221523131) Densifiedat 821C/12h/100bar, P51-02 Backscattered SEM image Optical image

  10. Big particle with Bi and Sr-rich composition PMM-130723-3 (powder lot: 8221523131) Densifiedat 821C/12h/100bar, P51-01 Backscattered SEM image Optical image

  11. Big particles with Bi-2212 composition PMM-130723-3 (powder lot: 8221523131) After 100 bar OP full HT

  12. Hard particles in green wire pmm130311 with Nexans lot 80) These hard particles are dense Bi-2212

  13. Summary • There are significant variations in Jc , and the 2nd billet is the best. • All 3 powders are on the low end of the Jc values obtained with much older Nexans regular and granulate powders used in the VHFSMC wires of 2009-2011. Those powders did not have significant hard particle counts • Most of the hard particles are dense Bi-2212.

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