Design and simulation of electron injection system for scattering off rare isotopes at FRIB.

The Facility for Rare Isotope Beams (FRIB) started operation on May 10, 2022, becoming the most powerful facility to study rare isotopes for nuclear astrophysics research. Several facilities are under developments to couple electron linacs to storage rings in Japan (SCRIT at RIKEN) and in Europe (ELISE at FAIR, GANIL, and DERICA in Dubna) with the possibility to extend past and current scattering experiments from stable nuclei to exotic nuclei. Of particular interest is the experimental measurement of the nuclear charge radius for these systems since such information is lacking for nuclei beyond Bi and is a critical ingredient for theoretical models. We investigate the structure for an electron beam that could be coupled to FRIB beamline to perform scattering experiments. The results from this study will be presented and discussed.