Upgraded photon calorimeter with integrating readout for Hall A Compton Polarimeter at Jefferson Lab
arXiv:1108.3116 · doi:10.1016/j.nima.2012.02.041
Abstract
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.
16 pages, 15 figures