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BSCCO - Cable reference designs and open issues

BSCCO - Cable reference designs and open issues. L. Bottura 12.12.13. Cable design principles. Attempt to achieve Comparable critical current (target 600 A/mm 2 , aim at about 400 A/mm 2 for initial magnet work) High compaction for high current density and homogeneous stress distribution

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BSCCO - Cable reference designs and open issues

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  1. BSCCO - Cable reference designs and open issues L. Bottura 12.12.13

  2. Cable design principles • Attempt to achieve • Comparable critical current (target 600 A/mm2, aim at about 400 A/mm2 for initial magnet work) • High compaction for high current density and homogeneous stress distribution • Cable transposition • Comparable dimensions • YBCO tape: consider Roebel as a baseline. Stack of tapes pursued by INPG. Drop other concepts (e.g. CORC, twisted pair) for magnet design purposes • BSCCO wires: consider only Rutherford as the baseline. Other configurations (e.g. 6-around-1) are presently pursued by other laboratories (e.g. LBNL, FNAL)

  3. 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: 28 • Cable width: 11.95 (mm) • Cable average thickness: 1.454 (mm) • Keystone angle: 0.6 (degrees) • Thin edge: 1.391 (mm) • Thick edge: 1.517 (mm) • Transposition pitch: 80 (mm) • Cable critical current: 8550 (A) (10 % degradation assumed) • Engineering current density (15 T, 4.2 K): 600 (A/mm2)

  4. Low or high compaction ? BSCCO Rutherford ? NOTE: high compaction may make magnet winding and mechanics much easier

  5. BSCCO cable issues • Cable manufacturing: this is in principle understood, and we have material. Establish a run schedule ? • Effect of strain and stress: measure a cable prototype (Twente press, FReSCa is much more labour intensive but over long lengths) • Can we consider all other issues resolved ? (LBNL experience, insulation, material compatibility)

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