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  • Jefferson Lab has four experimental halls. Hall C is 150 feet in diameter and 60 feet tall.

    Hall C houses two large spectrometers, the High Momentum Spectrometer and the new Super High Momentum Spectrometer.  The hall also provides space for temporary installation of other detectors such as the Neutral Particle Spectrometer and the Large Acceptance Detector.

    The research equipment in Hall C is used to study form factors and 3-D structure of simple quark systems, and short range structure in nuclei.

  • Theory and experiment combine to provide the most precise empirical extraction of the proton’s tensor charge, a fundamental property of the proton.

  • Scientists have made a new measurement that represents a breakthrough in their understanding of the proton’s mass.

  • Year Title Experiment Spokesperson
    2010-2012
      Qweak E08-016 Carlini, Finn, Kowalski, Page

  • General

    Photos and Figures

  • 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

  • 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

  • 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