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  • Year Title Experiment Spokesperson

    2010-2012
      Qweak E08-016 Carlini, Finn, Kowalski, Page
  • The HMS On-Call cell phone number is 817-7851.

  • 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 25 cm 35 cm
  • 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 0.001
  • 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
  • OPTICS TUNE:PARALLEL-PTPT-PT

    MOMENTUM:
    Maximum Central Momentum
    Momentum Bite[(Pmax-Pmin)/P0]
    Momentum Resolution delta p/p7.5 GeV/c
    18%
    <0.1%7.5 GeV/c
    18%
    <0.1%

    ACCEPTANCES:
    Solid Angle 
    Min. Central Scattering Angle 
    >6 msr
    12.5o 
    >6 msr
    12.5oAngle Measurement Precision

    In Scattering Plane
    Out-of-Plane

  • Pictured is the Hall C detector for the High Momentum Spectrometer (HMS). Contained in a concrete shield house, this detector is used for particle identification after the beam hits the target and the scattered particles are focused onto this detector . The detector contains several instruments that measure different elements of the particles including: drift chambers, hodoscopes, and gas and lead-glass Cerenkov detectors.

    HMS Detector