SHMS Spectrometer UpdateHall C 2008 Users Meeting

Paul Brindza

January 18, 2008

SHMS Design Parameters Parameter 2006 design (@ 7 GeV/c)

Range of Central Momentum

2 to 11 GeV/c for all angles

Momentum Acceptance -10% to 22%

Momentum Resolution 0.03-0.08%

Scattering Angle Range 5.5 to 40 degrees

Solid Angle Acceptance > 4.5 msr for all angles

Horizontal Angle Resolution

0.5-1.2 mrad

Vertical Angle Resolution 0.3-1.1 mrad

Vertex Length Resolution 0.1-0.3 cm

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

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)

Q1 Winding Tooling

Q1 Full Size Coil Sept 2007

Coil Pack Dimensions

10.52

10.54

10.56

10.58

10.60

10.62

10.64

10.66

10.68

10.70

10.72

-100 -50 0 50 100

Z-Position (cm)

Co

il P

ack

Th

ickn

ess

(cm

)

Straight A

Straight B

Uniformity of Q1 Coil straight section height

J-Lab Test Coil 2 - Shorted Turns Test

0.0

0.5

1.0

1.5

2.0

2.5

3.0

1 11 21 31 41 51 61 71 81

Turn

Vo

ltag

e (V

)

Verification of Insulation Integrity

SHMS Conductor Testing CompleteShort Sample Test Data

0

2000

4000

6000

8000

10000

12000

0 5 10 15 20 25 30

Test number

Cri

tica

l cu

rren

t

Series1

Series2

Series3

6 Tesla Data

7 Tesla Data

8 Tesla Data

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

NovaTechJLAB

ACCEL FERMI

Dipole and Q23 FEA results

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!!!!!