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  • Sebastian Kuhn at his workstation

    Sebastian Kuhn is a past chair of the Jefferson Lab Users Organization (JLUO) and current professor and eminent scholar at Old Dominion University. When he is not running an experiment in Hall B, Kuhn splits his time between his office, the university’s lecture hall, and his lab.

  • For theory group head, successful research and leadership comes from finding and keeping the right balance

    Jianwei Qiu has very full days managing his responsibilities at the lab. As Jefferson Lab’s associate director for theoretical and computational physics, most of his days are filled to the brim by attending meetings, reviewing papers and serving on the national and international advisory and review committees for funding agencies and various science programs.

  • Passion and commitment to hospitality drives Jefferson Lab conference manager, Anita Seay

    Anita Seay credits a fortuitous college job with laying the foundation for a career in hospitality and event management that eventually led her to a full-time role as events services conference manager at Jefferson Lab.

  • 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 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