BNL FNAL LBNL SLAC LHQ Status and Plan

BNL - FNAL - LBNL - SLAC LHQ Status and Plan Giorgio Ambrosio Fermilab 1 st Hi. Lumi 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) 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 1

Magnet Development Chart Completed Ongoing Starting 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 2

Length Scale-up Projects in LARP SM LR TQS LQS HQ LHQ 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 • From 0. 3 m to 4 m • Started in 2005, competed in 2008 • Racetrack coils, shell based structure • From 1 m to 4 m • Started in 2007, exp. completion 2012 • 90 mm aperture cos 2 q coils • Structure alignment • From 1 m to 4 m • Starting in 2011, exp. completion 2015 • 120 mm aperture cos 2 q coils • Full coil and structure alignment LHQ Status and Plans – G. Ambrosio 3

LHQ Features & Goals • LHQ is the main “Nb 3 Sn 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 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 4

Conductor • Strand for LHQ 01: — 0. 778 mm — OST RRP 108/127 • • Jc: > 2650 A/mm 2 (4. 2 K 12 T) Jc: > 1400 A/mm 2 (4. 2 K 15 T) Cu/non_Cu: 1. 22 Effective Filament size: ~52 um • Strand for LHQ 02: — 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 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 5

Cable and Insulation • Cable: — With 25 um stainless steel core — See “HQ cable development” by D. Dietderich • Insulation: — 0. 1 mm per side — Braided S 2 glass • Tests in progress with NEEW (optimization of thickness and coverage) 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 6

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 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 7

Coil Fabrication Technology • Same coil fabrication technology of revised HQ — winding (Ti-Al-V pole parts) — curing of ceramic binder (CTD 1202) — potting (CTD 101 K) — reaction (T = 210, 400, 6 xx °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 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 8

Supporting Structure • Supporting structure: — 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 2 m long • Structure with more accelerator features under development in the HQ program 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 9

Quench Protection • Analysis performed with Quench. Pro and Roxie • Experimental data from HQ (1 m) and LQ (4 m) — LHQ can be protected by extracting some energy (R = 40 m. W) and using LQ type heaters on coil ID and OD — T peak < 400 K (without quench back) — V max < 1000 V 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 10

Test • Test at FNAL VMTF: — T = 4. 6 – 2. 3 K • no superfluid He with present top plate FNAL structural plate — support similar to HQ test at CERN — new He recovery line — new warm bore for magnetic measurements: • 63 -68 mm ID FOUR SUSPENSION RODS 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 11

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 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 12

LHQ Schedule | 2012 | 2013 | 2014 | 2015 Practice coils Coil test in mirror Structure develop. & mech. model LHQ 01 coils (5) LHQ 01 assembly & test LHQ 01 b assembly & test LHQ 02 coils (5), assembly & test 10 coils, 1 coil test, 3 magnet tests by the middle of 2015 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 13

Conclusions • The LHQ is LARP’s last step for demonstrating Nb 3 Sn 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 1 st Hi. Lumi LHC / LARP Collaboration Mtg, Nov. 16, 2011 LHQ Status and Plans – G. Ambrosio 14