Calibration Of The Polarization Of A Frozen Spin Target PDF Download

This report lists the final, best estimate of the target polarization P[sub T] as a function of time for all of the periods during which scattering data were (or may have been) collected. The information under RUN'' refers to [Delta][sigma][sub L]-runs. The notation sfs'' stands for start of frozen spin, '' efs'' for end of frozen spin, '' [yields] la'' for go to large-aperture'' target magnet position, and nla'' for not large-aperture'' position, i.e., the target magnet is in polarizing'' position. Where the NOTE'' column is blank it means that all standard frozen-spin conditions were in effect: the target temperature was reduced and the magnet was in large-aperture position. The timing marks were developed on the basis of three criteria: (1) the availability of direct NMR data, (2) the inclusion of major Target and Run boundaries, and (3) the arbitrary inclusion of enough minor'' Run boundaries to shorten large timing gaps. The sign of the P[sub T]-values is given in the NMR convention: (+) corresponds to predominant occupation of the Zeeman ground state (the thermal'' NMR-signals are considered positive). Since the target magnet field pointed upstream, (+) corresponds to target spin antiparallel to the beam momentum. The estimated uncertainty on P[sub T] is [plus minus]6.5% (2[sigma]), and the estimated uncertainty on the ratio of values for the two signs of polarization, P[sub T](+)/PT([minus]), is [plus minus]4.3% (2[sigma]).