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SHMS Spectrometer Update Hall C 2008 Users Meeting. Paul Brindza January 18, 2008. SHMS Design Parameters . SHMS 2008. 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.
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SHMS Spectrometer UpdateHall C 2008 Users Meeting Paul Brindza January 18, 2008
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
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.)
Q23 2008 Force collar Aluminum 6cm -> 11 cm Coil “Keys” stainless Yoke ID 69->73 cm Length reduced by 12 cm Performance & size OK
Dipole 2008 Force collar 10 ->18 cm Yoke ID 69->79 cm Collar is Aluminum Coil “Keys” are Stainless Magnet OD is the same
SHMS Support Structure and Shield HouseRecent 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.
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
Q1 Trial WindingB stage tape application (left) Coil end turn former (right)
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
Dipole and Q23 FEA results ACCEL FERMI NovaTech JLAB
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!!!!!