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Summary of Magnet Systems Parallel Sessions

This summary highlights the progress of magnet systems parallel sessions during the LARP Collaboration Meeting held on May 18, 2011. It covers the development and future plans for magnet projects, including HQ, LHQ, TQS, LQS, and more. The document includes discussions on cable R&D, coil fabrication, quench performance, test timelines, and field quality analysis. It also outlines working group goals, test results, and upcoming steps in the magnet program.

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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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