Status and Installation Plan for the Spectrometer Solenoid Magnets

1. Status and Installation Plan for the Spectrometer Solenoid Magnets Steve Virostek Lawrence Berkeley National Lab MICE CM17 @ CERN February 24, 2007

2. MICE Cooling Channel Layout Spectrometer Solenoid 1 Spectrometer Solenoid 2 Steve Virostek - - - Lawrence Berkeley National Laboratory

3. Spectrometer Solenoid Overview • Order for two spectrometer solenoid magnets was placed with Wang NMR by LBNL in June ‘06 • Design review was held by Wang on Sept 6, 2006 • Complete design package book provided to LBNL • Detailed magnet design is complete and fabrication is well under way • First magnet shipment expected by Sep 07 • Second magnet to follow ~6 weeks later Steve Virostek - - - Lawrence Berkeley National Laboratory

4. Spectrometer Solenoid Fabrication Update • First machined coil former delivered to Wang • Preparation for coil winding is under way • First two cryocoolers to arrive at Wang on Feb 28th, two additional to follow two weeks later • Quench protection assemblies are near complete • Winding of fiberglass cold mass support bands will begin in early March • 50A HTC procured, 300A leads coming next week • Magnet instrumentation is on order Steve Virostek - - - Lawrence Berkeley National Laboratory

5. Lead Neck Cooler Neck He Filler Neck Cold Mass Support PMT Iron Shield Space for Radiation Shield Support Stand Steve Virostek - - - Lawrence Berkeley National Laboratory

6. 4.2 K Coolers Lead Neck He Gas Pipe Condenser Tank Cold Mass Cold Mass Support Liquid Pipe 4K End 60K Intercept 300K End Steve Virostek - - - Lawrence Berkeley National Laboratory

7. Cold Mass with 50 Ton Support System 300 K Support End Cold Mass Assembly 60 K Support Intercept Support Band 4 K Support End Steve Virostek - - - Lawrence Berkeley National Laboratory

8. Spectrometer Solenoid Cold Mass Passive Quench Protection Space Coil Cover End Coil 1 690 mm Match Coil 1 2544 mm End Coil 2 490 mm Center Coil Liquid Helium Space Match Coil 2 Coil Spacer Steve Virostek - - - Lawrence Berkeley National Laboratory

9. Design Overview (coil construction) • Single piece 6061-T6 aluminum coil former • Each layer wet wound using Stycast 2850 FT • 2.5 mil thick fiberglass between winding layers • Passive quench protection will be provided by a system of diodes & resistors • Aluminum coil banding will provide hoop force support and ensure coils are tight after cooldown • Conductor joints are to be lapped by at least 24” to minimize the I2R losses Steve Virostek - - - Lawrence Berkeley National Laboratory

10. First Completed Coil Winding Form Steve Virostek - - - Lawrence Berkeley National Laboratory

11. First Completed Coil Winding Form Steve Virostek - - - Lawrence Berkeley National Laboratory

12. First Completed Coil Winding Form Steve Virostek - - - Lawrence Berkeley National Laboratory

13. Vacuum Leak Check of Coil Winding Form Steve Virostek - - - Lawrence Berkeley National Laboratory

14. Vacuum Leak Check of Coil Winding Form Steve Virostek - - - Lawrence Berkeley National Laboratory

15. Vacuum Leak Check of Coil Winding Form Steve Virostek - - - Lawrence Berkeley National Laboratory

16. G-10 Material for Coil Side Insulation Steve Virostek - - - Lawrence Berkeley National Laboratory

17. Coil Winding Apparatus Steve Virostek - - - Lawrence Berkeley National Laboratory

18. Coil Winding Apparatus Steve Virostek - - - Lawrence Berkeley National Laboratory

19. Quench Protection & Power Supply Hookup Steve Virostek - - - Lawrence Berkeley National Laboratory

20. Quench Protection Diodes and Resistors Steve Virostek - - - Lawrence Berkeley National Laboratory

21. Quench Protection Diodes and Resistors Steve Virostek - - - Lawrence Berkeley National Laboratory

22. Quench Protection Diodes Steve Virostek - - - Lawrence Berkeley National Laboratory

23. Quench Protection Resistors Steve Virostek - - - Lawrence Berkeley National Laboratory

24. Quench Protection Assembly Parts Steve Virostek - - - Lawrence Berkeley National Laboratory

25. 50 Amp High TC Leads Steve Virostek - - - Lawrence Berkeley National Laboratory

26. Winding Form for Cold Mass Support Bands Steve Virostek - - - Lawrence Berkeley National Laboratory

27. Example of a Cold Mass Support Band Steve Virostek - - - Lawrence Berkeley National Laboratory

28. Example of a Quench Protection Assembly Steve Virostek - - - Lawrence Berkeley National Laboratory

29. Example of a Cold Mass Support System Steve Virostek - - - Lawrence Berkeley National Laboratory

30. Pulse Tube Cryocoolers • Two 1.5 W PT415’s will cool magnets to 45 K (1st stage) & 3.8 K (2nd stage) • ~0.05 T field @ cooler rotary valve motors (no iron shielding needed) • Up to three coolers per magnet can be installed and removed without breaking cryostat vacuum • Four units ordered by IIT – 1st two to arrive Feb 28th, 2nd two in ~2 weeks PT415 Pulse Tube Steve Virostek - - - Lawrence Berkeley National Laboratory

31. Magnet Power Supplies • Three power supplies of +300 A at ±10 V for the center and two match coils (shared for 2 magnets) • Four power supplies of ±50 A (may need 2 @ 60 A) at ±5 V for the two end coils (2 per magnet) • Power supply specification is nearly complete • Resolve issue of whether quick discharge circuit is needed • Address computer interface question • Settle on quantities (testing, operation @ RAL, spares) • 3 month lead time – place order soon after CM17 Steve Virostek - - - Lawrence Berkeley National Laboratory

32. Updated Schedule Summary Steve Virostek - - - Lawrence Berkeley National Laboratory

33. Installation Plan and Issues • Integration discussions ongoing with RAL • Module connection to rail system resolved • Required lifting features being finalized • Requirements for transfer through door of MICE hall @ RAL established • Flange sealing options being discussed • Vacuum pumping requirements defined Steve Virostek - - - Lawrence Berkeley National Laboratory

34. Summary • Detailed magnet design is complete • 1st coil former at Wang & ready for winding • 50 A HTC leads at vendor (300 A to follow) • Two cryocoolers to arrive on Feb 28 • P.S. spec is nearly complete – order ASAP • Expect 1st magnet complete by Sep 07 • Second magnet to follow ~6 weeks later Steve Virostek - - - Lawrence Berkeley National Laboratory