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NEWS ABOUT SHMS DESIGN
Single arm SHMS Monte Carlo has be updated
Note that for simulations for upcoming 12 GeV PACs, one should assume the "standard" 10 cm, 20 cm, and 30 cm cryotargets will be available. Please note that the total beam current available for Hall C and Hall A together will be 85 micro-amps (11 GeV equivalent).
CURRENT SHMS STUDIES AND R&D
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Year Title Experiment Spokesperson
2010-2012Qweak E08-016 Carlini, Finn, Kowalski, Page -
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Features:
- Conservative Superconducting Cold Fe Design
- Q2 & Q3 are Identical & Cryostable
- Multipole Windings
Specifications:
Q1 Q2/Q3 Gradient 605 G/cm 445 G/cm "Good Field" Radius 22 cm 30 cm Pole Tip Field 1.5 T 1.56 T Radius to Pole -
Features:
- Flat Racetrack, Cryostable Coils
- No Negative Curvature on Coil
- Graded Air Gap
- Flat Poles
- All Yoke Pieces <20 tons
Specifications:
Gap 421 cm Good Field Width +/- 30 cm Bend Angle 25o Max. Pole Tip Field 1.66 T (6 GeV/c) Dynamic Field Range 10:1 Field Uniformity B/B -
Performance of HMS Studied for Two Tunes:
Parallel ⇒ Point Best in plane angle accuracy. Point ⇒ Point Best vertex reconstruction. HMS Transmission Efficiency Studied as Functions of:
- Target location offsets
- Momentum offsets