Optics Calibration for the MOLLER Experiment (for the MOLLER Collaboration)

A precise measurement of the parity-violating asymmetry (A_PV) in MOLLER Experiment is strongly dependent on our ability to accurately determine the average kinematic factor and verifying the acceptance of the toroidal spectrometer system. The kinematic factor, for Møller scattering, depends not only on the scattering angle θ but also on the incident beam energy (E). The experiment aims to utilize the GEM tracking system in conjunction with a sieve-slit collimator and a set of thin foil targets to obtain an optics transport map between the variables defining the scattered electron (θ_lab, φ_lab, E', v_z) and the GEM variables (r, r', φ, φ') thus allowing the determination of the average kinematic factor as well as the acceptance function. In this talk, the various kinematic aspects that were involved in the development of the sieve-slit collimator design together with the performance of a Machine Learning based reconstruction algorithm will be presented.