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  • 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

  • HMS Central Momentum

  • HMS at Target

  • Online Documentation for Running Hall-C
    (username/password are available from Hall C Counting Room)

  • Click images to see enlarged version or download the zip file.

    E03-008

  • The Hall-C Moller Polarimeter measures the polarization of the electron beam arriving in Hall-C. It does so by observing the rate of production of Moller electrons at 90 degrees in the center of mass when the beam strikes a thin iron target. The outer shell electrons in the iron are polarized parallel (or anti-parallel) to the beam direction by a 4 Tesla magnetic field. The Moller electron production rate differs when the beam and target electron spins are aligned parallel or anti-parallel to one-another. Measurement of this rate difference provides a measure of the beam polarization.

  • Happy Holidays!

    seasons_greetings

     

    Dear Colleagues,

    As 2019 comes to a close, it is worth reflecting on all that was accomplished in the last year thanks to your hard work and dedication.

  • JLab Implementing MEDCON 5 Precautions Starting Tuesday, March 17 (msg.6)

     

    Posted on behalf of Lab Director, Stuart Henderson
     

    The growing number of COVID19 cases in our region, particularly James City County, requires more aggressive action to protect our employees, their families, our Users, visitors, and the community. At the recommendation of the Jefferson Lab Pandemic Advisory Team we are implementing MEDCON 5 effective today, Monday, March 16.