Upgraded photon calorimeter with integrating readout for Hall A Compton   Polarimeter at Jefferson Lab
  The photon arm of the Compton polarimeter in Hall A of Jefferson Lab has been upgraded to allow for electron beam polarization measurements with better than 1% accuracy. The data acquisition system (DAQ) now includes an integrating mode, which eliminates several systematic uncertainties inherent in the original counting-DAQ setup. The photon calorimeter has been replaced with a Ce-doped GSO crystal, which has a bright output and fast response, and works well for measurements using the new integrating method at electron beam energies from 1 to 6 GeV. 
M. Friend, D. Parno, F. Benmokhtar, A. Camsonne, M. Dalton, G. B.   Franklin, V. Mamyan, R. Michaels, S. Nanda, V. Nelyubin,...
physics.ins-det