1. SHMS Spectrometer Update Hall C 2008 Users Meeting Paul Brindza January 18, 2008

2. SHMS Design Parameters Parameter2006 design (@ 7 GeV/c) Range of Central Momentum2 to 11 GeV/c for all angles Momentum Acceptance-10% to 22% Momentum Resolution0.03-0.08% Scattering Angle Range5.5 to 40 degrees Solid Angle Acceptance> 4.5 msr for all angles Horizontal Angle Resolution0.5-1.2 mrad Vertical Angle Resolution0.3-1.1 mrad Vertex Length Resolution0.1-0.3 cm

3. SHMS 2008

4. HB a la MSU/NSCL 2008 MSU design has warm iron Meets SHMS spatial requirements Features a helium cooled coil and self supporting cryostat Trial Coil winding in 2008

5. Q1 2008 Trial wind R&D resulted in higher turns density 70 -> 92 turns/coil Q1 2008 is shorter- same length as the HMS Q1 (96 in. vs 107 in.)

6. Q23 2008 Force collar Aluminum 6cm -> 11 cm Coil “Keys” stainless Yoke ID 69->73 cm Length reduced by 12 cm Performance & size OK

7. Dipole 2008 Force collar 10 ->18 cm Yoke ID 69->79 cm Collar is Aluminum Coil “Keys” are Stainless Magnet OD is the same

8. SHMS Support Structure and Shield House Recent work by ALION-JJMA Dec 2007 Design updated to current SHMS design “slider” removed-all magnets now fixed HB magnet inserted Current design for magnets and detectors Current angular range (5.5 to 40 degrees) Current angle SHMS-HMS (18 degrees) Preliminary Shield House design with side access- shielding simulation underway.

11. Q1 Trial winding- 2007 results JLAB contracted with Scientific Magnetics to develop Q1 coil tooling and wind coils Phase 1 is complete and produced one full size trial coil that passed all tests Phase 2 is about to start and will produce 2 full size Q1 coils Phase 1 demonstrated a higher turns density(92 vs 70) resulting in a shorter Q1

12. Q1 Trial Winding B stage tape application (left) Coil end turn former (right)

13. Q1 Winding Tooling

14. Q1 Full Size Coil Sept 2007

15. Uniformity of Q1 Coil straight section height

16. Verification of Insulation Integrity

17. SHMS Conductor Testing Complete

18. Q23 and Dipole Force Collar Analysis Parallel analysis projects at JLAB, FNAL, ACCEL and NOVATECH Consensus results( ie typical data) suggest Use thicker Aluminum Force collar Use Stainless “keys” instead of Titanium Preload achieved after cool down Coils stay clamped at Max Field Need to measure copper stabilizer properties at 4.2 Kelvin- R&D at FNAL in 2008

19. NovaTech JLAB ACCEL FERMI Dipole and Q23 FEA results

20. SHMS Conclusions Improvements in magnet designs have increased the available free space along SHMS optical axis R&D program: HB Design, Q1 Trial Wind and Force Collar Analysis resulted in improvements in the SHMS design and Value Engineering Support Structure design work has advanced credibility and confidence in SHMS Design. Believe it or not we will start SC magnet procurement this summer!!!!!