Record setting electron beam polarimetry at 2 GeV

A new level of accuracy in the measurement of electron beam polarization using Compton polarimetry was achieved during the CREX experiment. Conducted in experimental Hall A at Jefferson Lab in 2020, the back-scattered photons from the Compton scattering process were detected. A total uncertainty of dP/P=0.36% was achieved, surpassing even the measurement from the SLAC Large Detector (SLD) Compton polarimeter. The future Jefferson Lab flagship measurements to be made by the MOLLER and SoLID experiments will required polarization at this level. In this talk I will detail the steps required to achieve this high precision measurement.