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WP10.2 – status

WP10.2 – status. Reported by L. Bottura and C. Senatore Meeting at CERN, February 2 nd , 2014. Overview of cable options. Result of the discussion on tape/cables. Roebel Mechanical properties and response to loading Manufacturing process for long length, compact cable geometry

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WP10.2 – status

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  1. WP10.2 – status Reported by L. Bottura and C. Senatore Meeting at CERN, February 2nd, 2014

  2. Overview of cable options

  3. Result of the discussion on tape/cables • Roebel • Mechanical properties and response to loading • Manufacturing process for long length, compact cable geometry • Windability (difficult axis direction and matching the transposition to the curvature radius) • Stacks • Transposition, need and effect of lack of transposition • Effect of transverse forces on the twisting region • All • Impregnation and insulation effects on tapes (delamination, stress distribution) • Protection and need of copper • Striation (how much do we need ?) • Dummies for winding tests • Parallel/transverse field effects and interaction with magnet design

  4. BSCCO Rutherford • Strand parameters • Strand diameter: 0.8 (mm) • Engineering current density (15 T, 4.2 K): 675 (A/mm2) • BSCCO current density (15 T, 4.2 K): 1930 (A/mm2) • Critical current (15 T, 4.2 K): 340 (A) • Cable proposal: • Number of strands: 22 • Cable width: 9.5 (mm) • Cable average thickness: 1.45 (mm) • Keystone angle: 0.6 (degrees) • Thin edge: 1.391 (mm) • Thick edge: 1.517 (mm) • Transposition pitch: 65 (mm) • Cable critical current: 6700 (A)

  5. REBCO Roebel – tape • Target Tape parameters • Tape width: 12 (mm) • Tape thickness: 0.1 … 0.15 (mm) • Engineering current density (15 T, 4.2 K): 450 (A/mm2) • Critical current (15 T, 4.2 K): ≈ 800 A • SC layer: 1…2 mm (TBD) • Cu layer: 30…50 mm (TBD) • Homogeneity and defects TBD to assess the effect of punching • Bonding strength (delamination issue)

  6. Cut tape geometry • Optimal geometry defined by KIT Status at KIT: t= 5.5 mm g= 1 mm α = 30 ° p=126, 226, 426 mm a g t R = 1-2 mm to reduce stresses , seeC. Barth, et al. Supercond. Sci. Technol. 25 (2012) 025007 p By courtesy of A. Karlo, ITEP KIT

  7. REBCO Roebel – wide (block coil) • Number of tapes (-) 15 • Cable width (mm) 12 • Cable thickness (mm) 1.2 • Transposition pitch (mm) 226 • Critical current (Bperp) (kA) 5

  8. REBCO Roebel – KIT “stock” • Transposition 226 mm • 15 tapes (only SC) • cable thickness: 1.1 mm • critical current with 10% degradation: 5030 A • Transposition 426 mm • 28 tapes (only sc) • cable thickness: 2.1 mm • critical current with 10% degradation: 9390 A • 27 superconducting tapes and 27*0.15 mm Cu • cable thickness: 4.2 mm • critical current with 10% degradation: 9054 A • 14 superconducting tapes (loose cable) • critical current with 10% degradation: 5350 A By courtesy of A. Kario, ITEP KIT

  9. REBCO Roebel – narrow (cos-q coil) • Number of tapes (-) 8 15 • Cable width (mm) 10 10 • Cable thickness (mm) 0.44 0.88 • Transposition pitch (mm) 126 226 • Critical current (perp) (kA) 1.7 3

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