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.
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The Electron-Ion Collider is a proposed machine for delving deeper than ever before into the building blocks of matter, so that we may better understand the matter within us and its role in the universe around us.