JEFFERSON LAB SEARCH
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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 PrecisionIn 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.
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Online Documentation for Running Hall-C
(username/password are available from Hall C Counting Room) -
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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.