1. LQ Goals and Design Study Summary – G. Ambrosio 1 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 BNL - FNAL - LBNL - SLAC LQ Goals & Design Summary Giorgio Ambrosio LARP 9 th Collaboration Meeting Oct. 17-19, 2007 OUTLINE: LQ goals LQ design status

2. LQ Goals and Design Study Summary – G. Ambrosio 2 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 LQ Goals GOALS: Gradient: 200+ T/m Aperture: 90 mm magnet length: 4 m Timeframe: Performance and reproducibility by the end of 2009

3. LQ Goals and Design Study Summary – G. Ambrosio 3 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 LQ Goals + The LQ may also be an opportunity to test some accelerator features (such as alignment, unrestricted cooldown) in long Nb 3 Sn magnets Questions for discussion: What features? Is this important, necessary, negligible? Could an LQ with accelerator features become QA?

4. LQ Goals and Design Study Summary – G. Ambrosio 4 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 The Road to the LQ Technological Quadrupoles, LQ task (FY08) Long Quad. Design Study Long RacetrackLong mirror Long Quadrupole Practice coils LQ01, LQ02, LQ03

5. LQ Goals and Design Study Summary – G. Ambrosio 5 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 Magnetic Design Coil layout = TQs Iron yoke design depends on mechanical structure –Collar design with iron yoke up to the ends –Shell design may have ss pads ParameterUnitTQCTQS N of layers-2 136 29.33 N of turns- Coil area (Cu + nonCu)cm 2 4.2 K temperature Quench gradientT/m221234 Quench currentkA13.313.2 Peak field in the body at quenchT11.512.0 Peak field in the end at quenchT11.911.8 Inductance at quenchmH/m4.565.03 Stored energy at quenchkJ/m406438 1.9 K temperature Quench gradientT/m238252 Quench currentkA14.4 Peak field in the body at quenchT12.412.9 Peak field in the end at quenchT12.912.7 Stored energy at quenchkJ/m472511

6. LQ Goals and Design Study Summary – G. Ambrosio 6 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 Conductor Cable: –LQ cable design = TQ cable design Strand: –RRP 54/61 for LQ01 Strand used in TQS02 coils (also in TQE02) and LR Good performance at 4.5K Limited performance at 1.9K under investigation –Higher number of subelements considered for following LQs Options: 114/127, 108/127, … Possible CERN-LARP collab. More info and discussion in the Materials session

7. LQ Goals and Design Study Summary – G. Ambrosio 7 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 Mechanical Design TQC Hybrid designTQS Both TQ designs are options for the LQ, the hybrid design cannot be considered because lacking short models

8. LQ Goals and Design Study Summary – G. Ambrosio 8 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 Mechanical Design Following presentations will show details of the LQ Support Structure options LQ Support Structure Review –Nov 28-29, at BNL –Originally thought of as Selection Review, –Presently considered as Plan Review More on these topics at the end of the session

9. LQ Goals and Design Study Summary – G. Ambrosio 9 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 Coil Fabrication Technology LQ coils = TQ coils + minor modifications –Pole material: Ti-Al-V (as TQS02 coils, also used in TQE02) –Ground insulation: Kapton wrap (as TQC coils) 1 kV Hi-pot test –Soldering to traces outside of the magnet (new features) –Outer layer glued to the coil (as TQS coils) –Pins to lock inner and outer layer Goal: to improve coil fabrication process reliability –Insulation: LQ01 will use TQ sleeve Tested also on LR NbTi leads: 0.7  1 mm ?

10. LQ Goals and Design Study Summary – G. Ambrosio 10 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 Quench Protection Goal: –MIITs < 7.5  Temp < 380 K Quench protection parameters (4.5 K) –Dump resistance: 60 m  (extract ~1/3 of the energy; V leads ~ 800 V) –100% heater coverage (  heaters also on the inner layer) –Detection time: ~5 msbased on TQs with I > 80% ssl –Heater delay time: 15 msbased on TQs with I > 80% ssl

11. LQ Goals and Design Study Summary – G. Ambrosio 11 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 Coil Instrumentation (…in progress) Voltage taps: –Inner layer: 4 VTs more than TQC (+5-1) Goals : splice, pole-midplane blocks, pole turn (lead end, return end, layer-ramp, straight section), 2 nd turn –Outer layer: Same as TQs Goals: splice, pole turn (lead end, return end, layer-ramp) Strain gauges as TQS Protection heater on both layers Will need two traces (1.5 m each) for layer –May still be too much… Work in progress Bubbles: plan tests at 4.5, 2.5 K and 1.9K (at the end) –Bubble proof heater design?

12. LQ Goals and Design Study Summary – G. Ambrosio 12 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 Next Complete LQ Design Study Report before the LQ Support Structure Review

13. LQ Goals and Design Study Summary – G. Ambrosio 13 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 Next talks Session 5B Magnets - LQ session1 Chair Ambrosio Redwood Room- C/ D 9: 00 9: 20 Ambrosio LQ goals and DS summary 9: 20 9: 40 Schmalzle LR summary and LQ work at BNL 9: 40 10: 00 Nobrega LM summary and LQ work at Fermilab 10: 00 10: 20 all Discussion 10: 20 10: 35 Coffee Session 6B Magnets - LQ session2 Chair Ambrosio Redwood Room- C/ D 10: 35 10: 55 Ferracin LQ support option - segmented shell 10: 55 11: 15 Bossert LQ support option - collars 11: 15 11: 35 Ambrosio LQ plans 11: 35 11: 55 all Discussion

14. LQ Goals and Design Study Summary – G. Ambrosio 14 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 Appendix

15. LQ Goals and Design Study Summary – G. Ambrosio 15 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 LQ inner layer NEW GOALS: Splice: A1-A2; pole-midplane blocks: A3&A5 (redundancy); lead end: A6-A7 Return end: A8-A9; layer-ramp: A10; straight section vs. ~ends: 4 VTs NEW 2 nd turn: NEW 500 mm ? Quadrant 3 Inner A1A2 A5 A4 A6 A10 A7 A3 A8 A9 NEW

16. LQ Goals and Design Study Summary – G. Ambrosio 16 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 TQs Heater Delay & Detection Time Heater delay time: t < 10 ms close to quench plateau; t < 15 ms at I = 62% I ssl Detection time: 3 - 11 ms during TQS01c training –Flux jumps up to 600 mV with MJR cable TQC01 TQC01 protection heater studies by using spot heaters to initiate the quench. msec TQS01c

17. LQ Goals and Design Study Summary – G. Ambrosio 17 LARP Collab Mtg – SLAC, Oct. 17-19, 2007 MIITs Limit During TQC01 test, one QI vs. T measurement I: 5000 A,QI: 9.05 MIITs, Peak Temp: 340 K Impact on quench performance of high-MIITs quenches (TQS01c) + 4% after 8 MIITs - 2.9% after 8.1 MIITs - 7.4% after 8.7 MIITs - 18.4 after 9.5 MIITs Small bumps at 7.5 MIITs