Muon Magnet R&D Status 5 Year Plan Review Preparation

1. Muon Magnet R&D Status5 Year Plan Review Preparation • 5 Year Plan • MUTAC Comments and Recommendations • Activities Since MUTAC Review • Near Term Plans Michael Lamm MCTF Meeting Sept. 3, 2009 1

2. Magnet R&D in the 5 Year Plan Areas of Study (Section 5.3) • Magnets for 6-D cooling-emphasis on HCC • Very high field solenoids for final cooling • Collider and IR magnets • Other magnets and magnet issues • Fast Ramping Synchrotron Magnets • 10-15 T solenoid for late-stage 6-D cooling • Cost models for MC magnet components Not called out explicitly in the magnet plan is Guggenheim or FIFO snakes (although it is part of the Section 5.5 Cooling Tests and Experiments) Michael Lamm MCTF Meeting Sept. 3, 2009 2

3. 5 Year Plan High Field Cooling Channel Solenoids From 5 Year Plan: “Very high field solenoids with on-axis fields in excess of 30T and apertures on the order of 50 mm are part of the baseline design….” Plan: • Develop functional specs • Evaluate/compile info on state of the art of conductors. Propose R&D to fill in gaps from existing data and National HTS program, through additional conductor tests. • Build HTS and hybrid inserts to prove technology • Conceptual design for highest field practical magnet • Present plan for building magnets in years 1-3 post plan Michael Lamm MCTF Meeting Sept. 3, 2009 3

4. 5 Year Helical Cooling Channel Solenoids “...several technical issues need to be addressed including • Magnetic matching sections • Functional specs including tune-ability, RF integration, heat loads “ Plan: • Conceptual design of full scale HCC with RF, matching sections, etc. • Fabricate four coil solenoids to prove technology • Coil winding, cooling, NbTi, Nb3Sn, HTS? • Build short demonstration magnet that is capable of housing RF cavities by end of 5 year plan Michael Lamm MCTF Meeting Sept. 3, 2009 4

5. 5 Year Collider Magnets • High field dipoles keep the ring diameter small and increase number of crossings. • Magnets operate in high radiation/ heat load environment • Build on existing accelerator magnet technology as much as possible • Two approaches: open midplane and wide aperture plus absorber Plan • Compare design options for dipoles and quads • Design magnets elements to a level sufficient to support preliminary cost estimates • Propose longer range studies Michael Lamm MCTF Meeting Sept. 3, 2009 5

6. 5 Year “other magnets”Fast Ramping Synchrotron Magnets.. • From the April 2009 MUTAC Magnet Talk…. • One novel muon acceleration concept utilizes a very rapid cycling synchrotron. In a proposed scenario using the existing Tevatron tunnel to accelerate muons from 30 to 750 GeV in 72 turns (See D.J. Summers talk this Meeting). • Each of the Tevatron half-cell’s four main dipoles are replaced by three fast ramping dipoles that ramp at 550 Hz from –1.8 T to +1.8 T, interleaved with 8 T fixed superconducting dipoles. • These magnets would utilize 3 mm copper tubing and 0.28 mm grain-oriented silicon steel laminations, plus a 2% duty cycle, to mitigate eddy-current losses. • This would be a two-year program, with the 30 cm long prototype dipole built in the first year and the 6.3 m long prototype dipole built in the second year. Michael Lamm MCTF Meeting Sept. 3, 2009 6

7. Preliminary Cost and Effort Michael Lamm MCTF Meeting Sept. 3, 2009 7

8. MUTAC April 09 Final Report…Section J Findings: ……It will be important to develop a model for the magnet development versus project performance and cost risk to help optimize the R&D plan and then develop priorities for the different aspects of the magnet R&D program. The magnet program must support a design that is still changing. In particular, there are multiple cooling approaches with different magnet requirements that are being considered. Developing a program with milestones and decision points will be essential to coordinate the different R&D programs and understand how the magnet R&D program needs to evolve as the NF/MC design evolves. Milestones would include the choice of final cooling stage field, the cooling technology, and the ring magnet design. Interpret: We need plan for magnet development closely coordinated with accelerator design Michael Lamm MCTF Meeting Sept. 3, 2009 8

9. MUTAC April 09 Comments The high field solenoids are a critical challenge. The plan to first develop HTS conductor and then to apply the HTS conductor to hybrid magnets seems sound. It would be important to benefit as much as possible from similar programs being pursued in other fields such as the NMR magnets. Understanding the radiation performance of the HTS could be very useful – if the HTS is radiation hard, it could have broad benefits to the NF/MC design. The effort in developing the HTS conductor should examine similar programs around the world to see if additional collaboration is possible. Interpret: Emphasis on conductor R&D is right approach for now The modular HTS test facility sounds like a good development. It would be good to hear plans and progress at the next review. HCC magnets have a range of specifications. The 5-year plan includes development of a 1-meter section of the lowest field portion of the HCC with the integrated RF. Developing concepts for inserting and powering the RF cavities in the HCC could be useful before progressing too far along the prototyping route. Interpret: Solving the RF integration sooner than later is crucial Michael Lamm MCTF Meeting Sept. 3, 2009 9

10. MUTAC Recommendations Recommendations: Develop a model for the magnet development program including crucial milestones and decision points. …follows from findings The committee would like to hear plans and progress on the modular HTS test facility at the next review. …discussed on subsequent slides Michael Lamm MCTF Meeting Sept. 3, 2009 10

11. Magnet Activities Since MUTAC (April 2009) • MUTAC Magnet Presentations in April (Kashikhin) and MCTF presentation in March (Zlobin) give good picture of magnet activities… • Here is an update and summary of 2009 activities: • 4-Coil Magnet Results Presented at PAC09 and CEC/ICMC 09 • Start construction of 2nd and 3rd Magnet • Conceptual Design of stage 4 HCC • Studies on incorporating RF in HCC • Study on optimized Quads for Collider IP Palmer/Summers • Update on Fast Ramping Cyclotron Magnets • Progress on National HTS Program • Progress on HTS pancake coils “modular HTS facility” Michael Lamm MCTF Meeting Sept. 3, 2009 11

12. 4-Coil Model #1 Test Results Good agreement between magnetic measurement and prediction. Reached ~85% of short sample limit, which is the operation point for the magnet . Michael Lamm MCTF Meeting Sept. 3, 2009 12

13. 4-Coil Model 1 Autopsy in 2009 • The cold mass autopsy showed the places for improvements: • Coil geometry with 9 turns worse than with 10 turns; • Large voids in space between coils; • G10 spacers bending; • Too thick epoxy areas; Michael Lamm MCTF Meeting Sept. 3, 2009 13

14. HS NbTi Model 2 in 2009 • The main goal of building the second model is to improve the solenoid manufacturing technology • Outer stainless steel support rings will be replaced by Aluminum rings. It will provide the coil prestress after cooling down and will improve the solenoid performance; • Will be used two stages of epoxy impregnation: the first is with conventional for SC magnets epoxy resin and the second with the epoxy filler (Cab-o-Sil). During second stage the epoxy will fill all large areas which had voids. Such process will help to avoid number of epoxy cracks during magnet training; • The SSC superconducting cable has been dekeystoned to the rectangular cross-section to improve winding process. • Coil parts are being fabricated, expected magnet completion: fall 2009 Michael Lamm MCTF Meeting Sept. 3, 2009 14

15. Conceptual Designs HCC Section 4 Design Study M. Lopes et al Pac09 Using parameters for HCC sections and state of the art Je for HTS and Nb3Sn • Tight coupling between field requirements • Field depends on coil thickness • Probably need external solenoid fields to generate proper Bt,Bz, G Supported by SBIR with Muons Inc Michael Lamm MCTF Meeting Sept. 3, 2009 15

16. Incorporating RF into HCC Scheme for generating required helical quadrupole field Radial cross section of HCC with realistic real estate for RF cavity, vacuum etc. K. Yonehara et al Pac09 Supported by SBIR with Muons Inc Michael Lamm MCTF Meeting Sept. 3, 2009 16

17. Optimized Quads for Collider IP • Motivation: gain luminosity by lowering b* higher gradient • Starting from LARP HQ design (i.e. wide aperture, cos(2Q) Investigate wide range of parameters • Reducing radius, varying dR/R • Conductor Grading • Exotic Materials for pole tips • Final focus design utilizing potential higher gradient • “Gupta” open mid-plane dipoles for collider ring • Use HTS for 15 T bore field • Potential luminosity gains utilizing the above Palmer/Summers MCTF Presentation 5/28/09 Michael Lamm MCTF Meeting Sept. 3, 2009 17

18. Update On Rapid Cycling Synchrotron Magnets • A very small prototype magnet was built over the summer and ran it at 1.6 Tesla DC. • Over the next 12 months they are building a 400 Hz, 1.8 Tesla prototype dipole See slide at end of talk Michael Lamm MCTF Meeting Sept. 3, 2009 18

19. MCTF-Related HTS Program in Support of High Field Solenoids • Small solenoid coils at Fermilab • National HTS Program (VHFSMC) • SBIR’s related to high field inserts • Note: there are active HTS magnet programs at LBNL, BNL, NHMFL and FNAL which contribute significantly to advancing the technology • For example: LBNL Bi2212 race track coils through their base program, coordinated with VHFSMC Michael Lamm MCTF Meeting Sept. 3, 2009 19

20. HTS Modular Insert Test Facility (ITF) • Designed to fit 14T/16T Teslatron magnet with 77 mm cold bore • Can stack up to 14 Double Pancakes units (ID=19 mm, OD=62 mm) • Expected hoop stress < 200 MPa • Calculated Peak Field on conductor ~25 T Commissioning in progress Michael Lamm MCTF Meeting Sept. 3, 2009 20

21. Small HTS Coils at Fermilab A number of double pancakes made of SuperPower SCS4050 (4 mm by 0.1 mm with 2x20 m of copper stabilizer) has been built and tested. A small geometry (ID=60 mm, OD=62 mm) was chosen to check winding procedures, turn to turn insulation, instrumentation and splicing techniques. Studies of the effect of impregnation produced results of optimal epoxy impregnation thicknesses. In-Field VI Curves In-Field Performance (0.1 V/m) 100% SSL Michael Lamm MCTF Meeting Sept. 3, 2009 21

22. VHFSMC Mission Answer whether a round wire Bi-2212 magnet technology is feasible Task 1 (k$500). Obtaining the needed high Jc and Je in long-length RW2212 by improving the microstructure and optimizing the heat treatment: FSU, LANL, LBNL, NIST Task 2 (k$248). Understanding the mechanical response of RW2212 conductors to axial and transverse strains: NIST, LBNL, FNAL Task 3 (k$263). Develop RW2212 cables into the Rutherford cable forms essential for accelerator magnets: FNAL, TAMU, LBNL, FSU Task 4 ($240). Study the quench process in RW2212 conductors and test coils: FSU, LBNL, BNL Task 5 (k$227). Construct small prototype coils that provide the essential demonstration that RW2212 is ready for real magnet construction: FSU, LBNL Task 6 (k$495). Development of an integrated industrial partnership with the large and small businesses: LANL, LBNL Program Management (k$27): BNL Michael Lamm MCTF Meeting Sept. 3, 2009 22

23. BSCCO Cables Developed for VHFSMC Task 3 Michael Lamm MCTF Meeting Sept. 3, 2009 23

24. Near Term (5 Year) Plans • Need to address MUTAC review + make progress on key R&D Issues from while we wait for full program to be funded • Continued progress on advanced SC materials • Work at National HTS Collaboration and Base Programs • Coordination of magnet effort with Muon Collider Accelerator physics • Solve practical issues with RF integration with 6-D cooling channels • Address apples to apples comparison of cooling schemes • Collider Magnet Specifications Michael Lamm MCTF Meeting Sept. 3, 2009 24

25. Collider Magnets • Use accelerator magnet programs to advance collider technology • Present lattice designs use ~10T dipoles and 200 T/m collider elements • Alexahin and Gianfelice-Wendt (Pac 09) • Present state of the art Nb3Sn magnets for LARP, LBNL and FNAL base program is ~starting point • Need to incorporate scheme for mid-plane radiation • R&D for 15 T magnets should be a 5 year plan goal • Comparable of magnet designs in LHC IR study in 2003 From “Energy Deposition Limits in a Nb3Sn Separation Dipole in Front of the LHC High Luminosity Inner Triplet, N. Mokhov et al. PAC 03 Michael Lamm MCTF Meeting Sept. 3, 2009 25

26. Propose Formation of Magnet Interface Working Groups Magnet builders, Other Accelerator Technologists (RF for e.g.) and Accelerator Designers • 6-D Cooling Magnets • Magnetic Solution to Full Channel • Including RF, magnetic insulation, matching section • Efficiency, feasibility, cost etc. • High Field Solenoids • Working Specification • Coordination with National HTS Program • … which has a need for straw man magnet design • Interact with SBIR Programs • Collider and IR Magnets • Lattice Requirements/wish list/what is practically achievable/in what time frame • Repository of full accelerator magnet parameter list Michael Lamm MCTF Meeting Sept. 3, 2009 26

27. Magnet Conclusion • 5 year plan for magnets is sound • Validation by MUTAC • Progress can and will continue despite 5 year plan approval and subsequent funding • Base programs, approved programs, SBIR’s • Fermilab, for e.g. will increase its base efforts on magnet R&D • Now is a good time to review magnet effort • Coordination magnet work with accelerator physics • Optimize use of available resources Michael Lamm MCTF Meeting Sept. 3, 2009 27

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