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Copper Cored Cable Tests and Studies

Copper Cored Cable Tests and Studies. Mirco Coccoli 29 October 2004. Outline. Historic review Organization/Guidelines Ongoing stuff Open Issues. Historic review. Subscale Magnet Program. First SM Series: Mixed Strand Cable DOE Review November 15 - 16, 2001 Mirco Coccoli.

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Copper Cored Cable Tests and Studies

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  1. Copper Cored Cable Tests and Studies Mirco Coccoli 29 October 2004

  2. Outline • Historic review • Organization/Guidelines • Ongoing stuff • Open Issues

  3. Historic review

  4. Subscale Magnet Program First SM Series: Mixed Strand Cable DOE ReviewNovember 15 - 16, 2001Mirco Coccoli Mirco Coccoli

  5. First SM Series Task • Mixed Strand Cable: • Our 810 in SM02: Mirco Coccoli

  6. Mixed strand Cable previous tests • LASA-INFN 1992 (Milano – Italy) • Facility SOLEMI: 18 Tesla Solenoid (“To increase the copper content some full copper strands are cabled together with the superconductive strands” E. Acerbi, L. Rossi et al.) • Westinghouse STC (Pittsburg, PA –USA) • 4 Tesla Background Navy SMES Cable Test Apparatus (“…35 strands […] 7 superconducting strands and 28 copper strands. […] suggesting cryostability.” D.W. Scherbarth et al.) Mirco Coccoli

  7. Electrodynamics of Rutherford Cables with Copper added as a Separate Component Mirco Coccoli July 2002 PART 1 Electrodynamics of Superconducting Rutherford Cables

  8. Electrodynamics of Rutherford Cables with Copper added as a Separate Component Mirco Coccoli July 2002 PART 3 Mixed Strand cable electrodynamics

  9. SH Heat Paths (1) One Layer Schematically…

  10. SH Heat Paths (2) One Layer Schematically…

  11. SH Heat Paths (3)

  12. Fabrication and Performance of Nb3Sn Rutherford-type Cable with Cu Added as a Separate ComponentR. M. Scanlan, M. Coccoli, S. Caspi, R. Hafalia, H. C. Higley, J. O’Neill, D. R. Dietderich, S. A. Gourlay, A. Lietzke, A. D. McInturff, and J. L. SabbiASC 2002Aug. 5, 2002

  13. Presentation Outline • Motivation and Methods for Cu Additions • Cable Fabrication Tests • Interstrand Resistance Measurements (see paper 5LG01) • Magnet Fabrication and Testing

  14. Cu is an essential component in superconducting composites • Mechanical--Cu can or tube provides support and a good interface with extrusion and drawing dies • Magnet protection--Cu matrix provides current shunt path in case of a magnet quench • Wire stability--Cu matrix provides a current shunt path that can improve stability during flux motion or mechanical motion

  15. Methods for adding Cu include: • Adding Cu at the beginning of wire fabrication (billet can or tube) • Pure Cu strands in a conventional Rutherford-type Cable • First level round cable with fine superconductor and Cu strands, followed by second level Rutherford-type cable • Copper core in Rutherford cable • External Cu strips or Cu braid on Rutherford cable.

  16. Prime motivation for adding Cu at cabling step is Cost • Labor costs for wire fabrication depend on volume of material processed. • Each application requires different amount of Cu, so each wire must be engineered and custom-made. • Standard design wire decreases manufacturing time, saves engineering costs and inventory costs. • These costs must be balanced against increased cabling costs when Cu is added to cable.

  17. Pure Cu strands added to Rutherford-type cable (Mixed strand cable) • Minimum Cu added to strands for manufacturability (25-30 volume %) • Additional Cu for magnet protection added as separate strands • --Jcu = 2200 A/mm2 for high inductance magnets (see paper 2LC01) • --Jcu = 2800 A/mm2 for small magnets (see paper 2LC01) • Initial trials with different tempers were not successful; improved with reduced diameter Cu strands.

  18. Rutherford cables with cores • Stainless steel/Cu/stainless steel sandwich core • No popped strands • Core buckled at site of splice, indicating significant core compression

  19. Rutherford Cable with core--2 • Cu/SS/SS/Cu core • Optimized composition (mimimum SS, maximum Cu) • Good cable manufacturability and good cable handling properties • Optimized electrical performance (high interstrand resistance, low adjacent strand resistance)

  20. Organization/Guidelines • We are neither CERN neither any other kind of large organization: we are 4 people • My request: anything done about CCC should be discussed among the four of us (to avoid missing the point of priorities) • Remark: if it is a good idea, it is good to work in a collaborative fashion (no decisions alone, no self-started development)

  21. Ongoing Stuff • ASC04 results plus Review of status among us  decide what’s next (plans for test?) • Design  done • Other practical stuff  thought but not done • No quench-antenna • Studies • Priority 0: communicate (meeting, coffee, lunch, W) • Priority 1: solve concerns regarding losses in the copper core (good to get “people” agreement) • Priority 2: simulations (1done+1coming? Stage) • Priority 3: any other study that has not been discussed with all of us

  22. What else today? • Outcome of ASC04 (Luca) • MoU signatures status (Andrzej) • Quench velocity model (Marco)

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