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High-Field Solenoids for a MC Final Cooling System

High-Field Solenoids for a MC Final Cooling System. AAC 2012 Austin, Texas June 11-15, 2012. Muon Collider Parameters. The MC Cooling Scenario. Proposed Final Cooling Lattice. HTS R&D at BNL.

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High-Field Solenoids for a MC Final Cooling System

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  1. High-Field Solenoids for a MC Final Cooling System AAC 2012 Austin, Texas June 11-15, 2012

  2. Muon Collider Parameters

  3. The MC Cooling Scenario

  4. Proposed Final Cooling Lattice

  5. HTS R&D at BNL • R. Gupta, P. Joshi, H. Kirk, R. Palmer, W. Sampson, Y. Shiroyanagi and P. Wanderer • Brookhaven National Laboratory • D. Cline, A. Garren, J. Kolonko, R. Scanlan, B. Weggel • Particle Beam Lasers, Inc

  6. Two Solenoids are being built and tested Solenoid #1 (Mid-sert) ID = 10cm OD=17cm 24 Pancakes Solenoid #2 (Insert) ID = 2.5cm OD=9.1cm 14 Pancakes

  7. YBCOHigh Temperature Superconductor (HTS) • The HTS Conductor • 2G Superpower YBCO tape • 4 mm wide • 100μm thick • 1μm YBCO (Yttrium Barium Copper Oxide) layer

  8. YBCO Tape: Angular Dependence • The critical current of YBCO is very different between background fields perpendicular and fields parallel YBCO measurements at National High Magnetic Field Lab (NHMFL) in Florida

  9. 10 cm ID 2G Coils for Mid-sert 100 mm Each coil has ~240 turns and uses 100 meter tape (maximum one splice)

  10. Test Results of 24 Coils at 77oK Proof That A Large Number of 2G HTS Coils Can be Built and Tested without Degradation Individual tests for each col

  11. Test of Half Mid-sert in LN2 (12 pancakes) Coil voltages in individual coil as a function of current Coil numbers are counted from one end to another end Overall performance is not limited by coils in the ends (where field perpendicular is largest). It is limited by 4th coil of the total 12 (i.e. one near the middle).

  12. Test Results at 4.2oKMeasured Critical Current As a function of Temperature 250 A ==> 9.2 T on coil 5 T on Axis Corresponds to 10T for full mid-sert This is the first test of large aperture, high field 2G magnet and also one that uses over 1 km (1.2 km) wire

  13. Insert Solenoid Construction • ID = 25 mm, OD = 91 mm • 4 mm wide 0.1 mm thick • Co-wound ~270 turns with 4 mm, 0.025 mm thick stainless steel tape.

  14. 7 double pancakes at 77oK 7 double pancakes were built and individually tested at 77o K. Voltage taps were attached every 50 turns.

  15. Pre-test @67oK – 77oK Coil #11, #5 and #6 became resistive first These coils are near the middle of the solenoid not the at the edges

  16. Summary of Test Results in LN2

  17. Test at 4.2o K The critical current of this solenoid was only 16 A at 77o K, however , current reached 285 A at 4.2oK. At this current, the central field was over 15 T and the peak field on the conductor was over 16 T. In LHe In LN2 gas He

  18. Future Plans • Step 1—Test together the full mid-sert and insert. 220A will yield 22T. • Step 2—Test the mid-ser/insert combination within the 20cm bore, 20T resistive magnet at NHMFL in Tallahassee. • Step 3—Depending on approval of an SBIR Phase II proposal, build a 13-15T Nb3Sn outsert coil with the goal of achieving 35T with an all superconducting solenoid.

  19. The Local Field Components Inner and outer coils together at design field Field Parallel (~22 T) Field Perpendicular (~6 T) In computing short sample limits, both local fields and angles need to be considered.

  20. Future Task #2 20+ T magnet in ~20 T field for a ~40T Test • Utilize the 20cm bore, 20 T field from a resistive solenoid at NHMFL. • Install support structures to deal with large hoop stresses • Update quench protection to take care of fault conditions

  21. Toward n all Superconducting 35T Solenoid • Collaboration between Particle Beam Lasers, Inc.(PBL) and Brookhaven National Laboratory. • An insert using YBCO HTS has reached a 15T axial field at 4.2oK. • A full length mid-sert delivering a 10T axial field • The mid-sert and insert together can deliver 22T • An outsert using Nb3Sn capable of 13-15T is proposed. midsert outsert insert

  22. SUMMARY • Final cooling scenario for a Muon Collider requires 30-40Tsolnoids • An YBCO based HTS solenoid with an ID of 2.5cm has achieved and axial field of 15T • An YBCO based HTS solenoid with an ID of 10cm capable of 10T axial field is being tested • A Nb3Sn based solinoid with an ID of 20cm, capable of delivering >13T is proposed

  23. Backup Slides

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