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LHQ Status and Plan Giorgio Ambrosio Fermilab

BNL - FNAL - LBNL - SLAC. LHQ Status and Plan Giorgio Ambrosio Fermilab. 1 st HiLumi LHC / LARP Collaboration Meeting CERN November 16-18, 2011. LHQ Task Leaders: Coil Fabrication + Instrum & Traces – J. Schmalzle (BNL), R. Bossert (FNAL) , … (LBNL)

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LHQ Status and Plan Giorgio Ambrosio Fermilab

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  1. BNL - FNAL - LBNL - SLAC LHQ Status and PlanGiorgio AmbrosioFermilab 1stHiLumi LHC / LARP Collaboration Meeting CERN November 16-18, 2011 LHQ Task Leaders: Coil Fabrication + Instrum & Traces – J. Schmalzle (BNL), R. Bossert (FNAL), … (LBNL) Mechanical Structure & Assembly – H. Felice (LBNL) • Test preparation and test – G. Chlachidize (FNAL)

  2. Magnet Development Chart Completed ~30% 85% 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 2015 • 120 mm aperture cos2q coils • Full coil and structure alignment

  4. LHQ Features & Goals • LHQ is the main “Nb3Sn technology demonstrator” • For technology selection for the LHC IR upgrade • Deadline: 2015 • Aperture: 120 mm (as HQ) • Coil length: 3.4 m (as LQ) • Success criteria: • Nominal gradient = 80% of SSL based on extracted strands • HQ/LHQ Grad ~ 160/175 T/m (@ 4.2/1.9 K) • Quenches to nominal gradient: 3 • Quenches to 110% of nominal gradient: 10 • Quenches to nominal gradient after therm. cycle: 1 • Magnetic requirements from HL-LHC Design Study

  5. Conductor • Strand for LHQ01: • 0.778 mm • OST RRP 108/127 • Jc: > 2650 A/mm2 (4.2K 12T) • Jc: > 1400 A/mm2 (4.2K 15T) • Cu/non_Cu: 1.22 • Effective Filament size: ~52 um • Strand for LHQ02: • OST RRP 108/127, 144/169, 192/217 • Effective Filament size: ~52, ~44, ~38 um • Jc may go down with smaller filament size • The US CDP needs feedback now for this choice

  6. Cable and Insulation • Cable: • With 25 um stainless steel core • See “HQ cable development” by D. Dietderich • Insulation: • 0.1 mm per side • Braided S2 glass • Tests in progress with NEEW (optimization of thickness and coverage)

  7. Cross Section • LHQ X-Section = Revised HQ X-Section • thinner and less wide cable • thicker layer-layer insulation • 250 um  500 um • Task force for coil parts adjustments • Goal: more robust design • ES: replace saddles after heat treatment with insulation-covered saddles • ES: improve insulation around trace-leads solder joints

  8. Coil Fabrication Technology • Same coil fabrication technology of revised HQ • winding (Ti-Al-V pole parts) • curing of ceramic binder (CTD 1202) • potting (CTD 101K) • reaction (T = 210, 400, 6xx °C) • Last plateau temperature depends on strand type • Long coil features: • gaps among pole pieces (for longitudinal diff. CTE) • 4 mm/m as in latest HQ coils • Lifting and handling procedures used for LQ coils

  9. Supporting Structure • Supportingstructure: • X-section: LHQ = HQ • With holes for cooling (TBD) • Scale up-features similar to LQ • Segmented shell (4) • Al-collars, pads and yoke made of laminations • Masters and keys 2m long • Structure with more accelerator features under development in the HQ program

  10. Quench Protection • Analysis performed with QuenchPro and Roxie • Experimental data from HQ (1m) and LQ (4m) • LHQ can be protected by extracting some energy (R = 40 mW) and using LQ type heaters on coil ID and OD • T peak < 400 K (without quench back) • V max < 1000 V

  11. FNAL structural plate FOUR SUSPENSION RODS Test • Test at FNAL VMTF: • T = 4.6 – 2.3 K • no superfluid He with present top plate • support similar to HQ test at CERN • new He recovery line • new warm bore for magnetic measurements: • 63-68 mm ID

  12. Fabrication and Test Plan • Cable: • Cabling: LBNL • Insulation: NEEW (or other vendor) • Coils: • Winding & curing: FNAL • Reaction & potting: BNL, LBNL • Instrumentation: BNL, FNAL, LBNL • Shipment structure (long version of HQ one): BNL • Structure: • Pre-assembly & magnet assembly: LBNL • Shipment similar to LQ • Test: • Warm and cold measurements: FNAL

  13. LHQ Schedule | 2012 | 2013 | 2014 | 2015 Practice coils Structure develop. & mech. model Coil test in mirror LHQ01 coils (5) LHQ01 assembly & test LHQ01b assembly & test LHQ02 coils (5), assembly & test 10 coils, 1 coil test, 3 magnet tests by the middle of 2015

  14. Conclusions • The LHQ is LARP’s last step for demonstrating Nb3Sn technology for the LHC Luminosity Upgrade • It builds upon the whole LARP R&D (HQ, LQ, …) with contributions from other programs • LHQ magnet test results are expected in 2014 - 15  For more Luminosity at the LHC

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