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LARP Magnet Progress

US LHC Accelerator Research Program. bnl - fnal - lbnl - slac. LARP Magnet Progress. Michael Lamm For the LARP Collaboration. All Experimenters’ Meeting Monday, October 8, 2007. US Accelerator Research Program (LARP).  What is LARP ?

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LARP Magnet Progress

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  1. US LHC Accelerator Research Program bnl - fnal - lbnl - slac LARP Magnet Progress Michael Lamm For the LARP Collaboration All Experimenters’ Meeting Monday, October 8, 2007

  2. US Accelerator Research Program (LARP) What is LARP ? • US Accelerator Specialist to play role in LHC Accelerator, commissioning, operation and performance upgrades • Fermilab AD/APC/TD play major role Magnet LARP Motivation • Existing 70 mm NbTi IR quads will likely be replaced after 4-7 years of operation to increase luminosity • We want to play a major role with CERN in developing these magnets Michael Lamm on LARP Magnets

  3. IR Higher Luminosity Replacement Magnets • IR Environment (low b, more interactions) • Wider beam profile, Larger G*dl, Higher energy deposition, More Radiation • Implications for Magnet Design • Wider Aperture, Higher Gradient  Higher field on conductor, SC Temperature Margin, Rad Hardened Materials • Utilize Nb3Sn Superconductor • Improved Nb3Sn magnet technology • Improved Nb3Sn conductor • Rad Hardened structure Michael Lamm on LARP Magnets

  4. One of a kind magnets Nb3Sn has been around for a while…. • 1960-1990 Nb3Sn/NbTi on parallel path • Alternative for Isabelle • SSC development • LHC 4.2 K Nb3Sn vs. 1.9K NbTi NbTi Wins! • 1990’s Generic R&D to push envelope Twente, LBNL, achieve up to 14. 7 T Nb3Sn Tape BNL W. B. Sampson, circa 1967 • 21st Century, Nb3Sn revisited for future VLHC, LHC upgrade • Conductor improvements in Nb3Sn vs. Field limitations in NbTi • Several participants by now... BNL, FNAL, LBNL,TAMU, CEA, Twente, KEK • 10’s of 1 meter models magnets successfully built, mostly in the US…. But never used in an actual accelerator Michael Lamm on LARP Magnets

  5. LARP 2009 Challenge • “Demonstrate that Nb3Sn magnets are a viable choice for an LHC IR upgrade” Milestone set in agreement with CERN  Technological Quadrupoles (TQ) for performance reproducibility 1 m long, 90 mm aperture Cos(2q), Gnom > 200 T/m, Bcoil > 12T  Scale up to 4 meter long (LQ) TQs-like cross section and mechanical structure, + experience from two long magnet intermediate studies  High gradientquadrupoles (HQ) to explore performance limits 1 m long, 90+ mm aperture, Gnom > 250 T/m, Bcoil > 15 T Michael Lamm on LARP Magnets

  6. Aluminum shell 4 pads Yoke Keys Filler Bladder 2 layers LBNL: concept, design, development, coils co-fabric., assembly & test FNAL: concept, design, development, coils co-fabric., assembly & test FNAL: coils co-fabric, test at 1.9K LBNL: coils co-fabric Technological Quadrupoles • Two mechanical designs are under development • Same coils / Aperture = 90 mm / Gradient > 200 T/m @ 4.2K TQC: using collars Collar laminations from LHC-IR quads 1st time applied to Nb3Sn coils TQS: using Al-shell Pre-loaded by bladders and keys 1st time applied to shell-type coils Michael Lamm on LARP Magnets

  7. TQC01b (Collar structure): Re-assembly of TQC01 with 2 TQS coils 85% ssl at 4.5 K 89% at 1.9 K Reached G = 200 T/m • Improvement over TQC01 in understanding and process control TQC01b training history TQS02 (Shell Structure): with next generation RRP 54/61 conductor, assembled at LBNL reached ~215 T/m at 4.5 K, little improvement at 1.9K 4.5K 1.9K 4.5K TQS02a training history Recent TQ Test Results at Fermilab TQE02: Build a TQC magnet with TQS02 coils Direct comparison of mechanical structures To be tested early Oct (this week!) Michael Lamm on LARP Magnets

  8. Plan for Length Scale-Up LENGTH SCALE-UP CHALLENGE: No Nb3Sn accelerator magnet longer than 1m has ever been built LARP should make a successful 4m long quadrupole by end of 09 Scale up quad (LQ) will be a 4 meter longer version of the TQ with TQS, TQC or hybrid structure Design Inputs to LQ: • TQ results and design studies • Long mirror • 2 m/4 m Nb3sn Cos (q) Dipole with COLLAR structure • Long race track • 4 m Nb3Sn Racetrack coil with SHELL Structure Michael Lamm on LARP Magnets

  9. From 0.3 m to 3.6 m LARP Long Racetrack The goals of the Long Racetrack (LR): • fabricate and test long Nb3Sn racetrack coils • test an Al-shell-based supporting structure (preloaded using bladders and keys) Reported in Sept 7, 2007 Fermilab Today Results: • Iq> 90% ssl LBNL Designed BNL Built/tested Michael Lamm on LARP Magnets

  10. SSL FNAL Long Mirror • This magnet is a base program contribution in support of LARP • FNAL “Mirror magnet” is a Nb3Sn cos(Q) dipole where a coil is substituted by iron blocks. • Long cos(Q) coils fabrication/reaction and collar mechanics prior to LQ LM02 quench history at 4.5K compared with 1m model Front view of mirror magnet Successful 2m mirror magnet test in May 2007 4m mirror magnet will be tested in November Michael Lamm on LARP Magnets

  11. LQ Status/Future Plans • We are developing a plan whose goal is to produce 2 4-meter long LQ’s by the end of CY 2009 • Program leader for LQ has been chosen (Giorgio Ambrosio) • Program will involve all three participating LARP Magnet Labs • Major issue to be decided is the mechanical structure • There will be an external review of the LQ program in late November Michael Lamm on LARP Magnets

  12. LARP Magnet Status • Several TQ Magnets have been built. All of them work well. Performance improves with successive rebuilt due to increased understand of mechanics and coil fabrication. • Scaleup to 4 meters is underway. 4 meter long racetrack and 2 meter long mirror dipole (4 meter test soon) LQ plan for 4 meter long cos(Q) underway • Beyond LQ several LARP activities toward final goal of Nb3Sn accelerator magnets (local leaders) • Conductor Studies for higher Jc better conductor stability (Barzi) • Join AP/Magnet IR studies (Zlobin) • HQ quad model program (project leaders at LBNL but with contributions from Fermilab on magnetic design for e.g.) • 1.9K Test facility and instrumentation upgrades Michael Lamm on LARP Magnets

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