Spectrometer Optics Calibration for PRex/CRex Experiment

The PRex-II and CRex experiments measure the model-independent RMS radius of the neutron skin thickness for $^{208}$Pb and $^{48}$Ca nuclei respectively using parity-violating asymmetry in elastic electron scattering. The neutron skin thickness is an important parameter that has a broad impact on modeling the neutron star structure, heavy iron collisions, and atomic parity violation experiments. PRex and CRex experiments were performed in Jefferson Lab Hall A with the High resolution Spectrometer(HRS) pair. In this report, I will discuss the Optics Calibration of the High Resolution Spectrometers, and the impact of the spectrometer optics on the neutron skin thickness results.