Model Magnet R&D (WBS 2.2) LARP Collaboration Meeting October 5-6, 2005 Gian Luca Sabbi

1. BNL - FNAL - LBNL - SLAC Model Magnet R&D (WBS 2.2) LARP Collaboration Meeting October 5-6, 2005 Gian Luca Sabbi

2. LARP Magnet Program Goals FY09 Milestone: Demonstrate viability of Nb3Sn technology for “Quad-first” option 1. Capability to deliver predictable, reproducible performance: TQ (Technology Quads, 2005-07) D = 90 mm, L = 1 m, Gnom > 200 T/m 2. Capability to scale-up the magnet length: LQ (Long Quadrupoles, 2008-09) D = 90 mm, L = 4 m, Gnom > 200 T/m 3. Capability to reach high gradient (pole tip field) in large aperture: HQ (High Gradient Quads, 2008-09) D = 90 mm, L = 1 m, Gnom > 250 T/m • Fabrication of the first two TQ quads (TQS01 and TQC01) has started • TQS01 test in February/March 2006; TQC01 test in April/May 2006

3. Technology Quads (TQ) • Objective: contribute to developing the technology base for LQ & HQ: • evaluate conductor and cable performance: stability, stress limits • develop and select coil fabrication procedures • select the mechanical design concept and support structure • demonstrate predictable and reproducible performance • Implementation: two series, same coil design, different structures: • TQSmodels: shell-based structure • TQC models: collar-based structure • Magnet parameters: • 1 m length, 90 mm aperture, 11-13 T coil peak field • Nominal gradient 200 T/m; maximum gradient 215-265 T/m

4. TQS01: Shell-based Structure • Concept: • Aluminum shell over yoke and pads • Assembly based on bladders and keys • Advantages: • Can deliver very high pre-stress • Large pre-stress increase at cool-down • Easy assembly/disassembly/reassembly • R&D issues: • Coil alignment, field quality • Long vs. segmented shells TQS01 task leader: S. Caspi - Test planned for February/March 2006

5. TQC01: Collar-based Structure • Concept: • Support by thick SS collars • Assembly w/external press • Advantages: • Proven coil positioning • Proven length scale-up • R&D issues: • Deliver required pre-stress • Pre-stress overshoot • Flexibility for R&D TQC01 task leader: R. Bossert - Test planned for April/May 2006

6. TQ Coil Winding Status • 6 unit lengths of practice cable and 10 UL of cable fabricated at LBNL • 8 insulated UL available for production coils, 2 additional UL to follow • 4 practice coils wound and cured at FNAL • Various improvement were included based on practice winding/curing • 2 production coils for TQS01 were fabricated at FNAL

7. TQ Coil Reaction and Impregnation • The first set of practice coils were reacted and impregnated at FNAL • Good results on the first set of impregnated coils • The second pair of practice coils is being reacted at LBNL • Strand & cable samples are being reacted with the practice coils • Reaction of first pair of production coils starts in 3 weeks

8. TQ mechanical models • Mechanical models using dummy coils: • TQS01 (2004) TQC01 (underway) • Mechanical models using the practice coils will be performed in the next 3 months in preparation for magnet assembly

9. TQ Schedule (Rev. 10/5/2005) Q3-05 Q4 2005 Q1 2006 Q2 2006 Q3 2006

10. TQ Program following TQS01-TQC01 • 1. Additional tests using the same coil design • TQS02: reconfigure/optimize based on TQS01 results • Increase preload?(e.g. 4.2 K to 1.9 K) Modify structure? (as for HD1) • Replace quadrant with spare?(if localized quenches observed) • TQC02: new coils (w/RRP conductor) in collar-based structure • Feedback from TQC01 can be incorporated at assembly • Coils might be redirected to TQS depending on test results • TQE01: coil-structure exchange • Disassemble TQC01 coil and test in TQS01 structure • Some technical issues to be addressed; decision after TQS01/TQC01 tests • 2. Coil iteration and fabrication of TQS03 & TQC03 coils

11. TQ plan after S01-C01 (Rev. 10/5/05)

12. Main focus for FY06-Q1 & Q2 Start in FY06, complete in FY07 Model Magnet Tasks & Budget Summary