Precision Electron Beam Polarimetry in Hall C at Jefferson Lab

Conference · Tue Oct 01 00:00:00 EDT 2013

OSTI ID:1989786

Gaskell, David ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

The electron beam polarization in experimental Hall C at Jefferson Lab is measured using two devices. The Hall-C/Basel M\o ller polarimeter measures the beam polarization via electron-electron scattering and utilizes a novel target system in which a pure iron foil is driven to magnetic saturation (out of plane) using a superconducting solenoid. A Compton polarimeter measures the polarization via electron-photon scattering, where the photons are provided by a high-power, CW laser coupled to a low gain Fabry-Perot cavity. In this case, both the Compton-scattered electrons and backscattered photons provide measurements of the beam polarization. Results from both polarimeters, acquired during the Q-Weak experiment in Hall C, will be presented. In particular, the results of a test in which the M\o ller and Compton polarimeters made interleaving measurements at identical beam currents will be shown. In addition, plans for operation of both devices after completion of the Jefferson Lab 12 GeV Upgrade will also be discussed.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1989786
• Report Number(s): JLAB-PHY-14-2072; DOE/OR/23177-6702
• Resource Relation: Conference: 2013 Fall Meeting of the APS Division of Nuclear Physics, October 23–26, 2013, Newport News, Virginia
• Country of Publication: United States
• Language: English