Narrow Search Results

Dummy Block

Dummy Block

JEFFERSON LAB SEARCH

(Show results from this date)
(Show results to this date)
*Use spaces between key words, no punctuation needed *Sign In for authenticated content

  • 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

  • Hall C maintains two general interest mailing lists. To subscribe to these lists, go to the link below and follow the "Subscribing to" instructions. A list of other public Jefferson Lab mailing lists is available.

  • 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

  • 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