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Summary of Magnet Systems Parallel Sessions

BNL - FNAL - LBNL - SLAC. Summary of Magnet Systems Parallel Sessions. GianLuca Sabbi LARP Collaboration Meeting 16 May 18, 2011. Magnet Development Chart. Completed. Ongoing. Starting. Length Scale-up Projects in LARP. SM. . LR. From 0.3 m to 4 m Started in 2005, competed in 2008

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Summary of Magnet Systems Parallel Sessions

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  1. BNL - FNAL - LBNL - SLAC Summary of Magnet SystemsParallel Sessions GianLuca Sabbi LARP Collaboration Meeting 16 May 18, 2011

  2. Magnet Development Chart Completed Ongoing Starting

  3. Length Scale-up Projects in LARP SM  LR • From 0.3 m to 4 m • Started in 2005, competed in 2008 • Racetrack coils, shell based structure TQS  LQS • From 1 m to 4 m • Started in 2007, exp. completion 2012 • 90 mm aperture cos2q coils • Structure alignment HQ  LHQ • From 1 m to 4 m • Starting in 2011, exp. completion 2016 • 120 mm aperture cos2q coils • Full coil and structure alignment

  4. Working Group Goals / Discussion Topics • 1) Review of cable R&D and coil fabrication data • Key decisions on new coil design for HQ and LHQ • 2) Review/analysis of recent test results and plans for next tests •  HQ01d quench performance and magnetic measurements • HQ mirror (test underway) • Next steps • Long term planning •  2011-14: HQ and LHQ (technology demonstration) • 2013-17: IR quad prototype (short and full length models) • 2015-20: Construction project

  5. LQS01 & LQS01b Quench Performance 200 T/m 200 T/m 4.5 K ~3 K 1.9 K

  6. Next Steps in the LQ Program • LQ surpassed its initial target by 10%. Current R&D goals are: • Fully reproduce the performance of the TQ short models • Higher gradient (240 T/m in TQS03) • Fast training (plateau in 5-10 quenches, no retraining) • Systematic analysis of coil length effects • Detailed modeling of the reaction process • Understand/optimize coil strain state after reaction • Design and process optimization for construction • Coil size control/reproducibility • Protection heater design, esp. for inner layer • One-side loading with 4 m keys/bladders • Cable insulation techniques for production

  7. HQ Test Timeline • May 2010 HQ01a (first High-Field Quadrupole) - LBNL • >155 T/m @4.5K, already above NbTi limit @1.9K • June 2010 HQ01b (revised coil-structure shims) - LBNL • First Quench >150 T/m (78%); insulation failure • July 2010 2010 DOE review • Oct. 2010 HQ01c (two new coils) - LBNL • Insulation OK, but lower quench levels (~135 T/m) • Nov. 2010 CM15 • Apr. 2011 HQ01d (one new coil) - LBNL • Insulation OK, ~170 T/m (86%) mechanically limited • May 2011 HQM01 mirror test - FNAL • Special “large” coil with cored cable, ~80% of SSL

  8. HQ01d Test Analysis: Quench performance NbTi operating target (120 T/m)

  9. HQ01d Quench Locations: Pole Turn

  10. Pole Turn Quench Precursors

  11. HQ01d Quench Locations: Coil Mid-Plane • May indicate degradation due to high stress (also observed in TQ) • Need to be careful with pre-load increases

  12. HQ01d Test Analysis: Geometric Harmonics Central Field (120 T/m, 40 mm radius) End Field (9kA, 21.5 mm radius) Good results indicating the alignment features introduced in the coil fabrication and support structure are working well

  13. HQ01d Field Quality: Dynamic Effects Large eddy current effects and reproducible “spikes” with long (~10s) decay time

  14. HQM01 Mirror Test • Mirror structure allows to test single coils: •  Efficient way to study design variations • Special coils bring special challenges • First test: larger cavity and cored cable Very significant improvement in ramp rate dependence Expect smaller and better controlled eddy current harmonics

  15. HQ01d Pole stress during excitation Pre-load was intentionally decreased (safer for insulation and conductor degradation) HQ01d coil 8 HQ01d – all coils LQS01a TQS03a

  16. HQ01e Assembly • Asymmetric loading to improve stress uniformity • Could also be used to optimize geometric field quality

  17. HQ Coil Design and Fabrication • HQ design assumed less space for inter-turn insulation than TQ/LQ • Based on measurements, but limits expansion during reaction • As a result, coils are over sized and over compressed

  18. HQ coils – from CM15 to CM16 “Clear signs of over compressed coils” Increase radial allowance in coil parts • Above pictures were shown at CM15. Since then: • Analyze & quantify this effect – Coil “task force” • Most efficient correction strategy – Cable R&D • CM16 main goal: review all data and decide how to move forward • Need to satisfy requirements for both HQ and LHQ

  19. HQ Cable Development

  20. Cable cross-sections 1014 1015-L 1015-L Goals: smaller cross-section, no damage, mechanical stability

  21. Extracted Strand Ic Measurements - 1014

  22. Extracted Strand Ic Measurements - 1015

  23. Parameters for Next HQ (LHQ) Coils

  24. Conductor Inventory & Cabling Plan

  25. Long HQ Development Plan for 2011-2013

  26. LHC Schedule

  27. IR Quad Schedule • Coil fabrication drives production schedule. Assuming 2 parallel lines, 64 full length coils • DOE approval process (CD-n reviews) should start this year to allow project start in 2014

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