Measurement of the Neutron Electromagnetic Form Factor with Large Acceptance at High Rates

The neutron electromagnetic form factors, G_Eⁿ and G_Mⁿ, give important insights into the neutron structure. In previous experiments the proton electromagnetic form factors, G_E^p, was measured up to Q² = 8.5 GeV², and G_M^p was measured up to Q² = 30 GeV², while G_Eⁿ has only been measured up to Q² = 3.4 GeV². The Super BigBite Spectrometer (SBS) program at JLab will measure the neutron form factor ratio, G_Eⁿ/G_Mⁿ, at Q² values of 2.9, 6.6, and 9.7 GeV² by scattering a polarized electron beam with a polarized ³He target, used here as an effective polarized neutron target, and measuring the double spin asymmetry of the cross section. Measurements of Q² = 2.9 and 6.6 GeV² was completed in December 2022, and Q² = 9.7 GeV² will be complete in October 2023. The analysis of this data is especially challenging due to the unprecedented high-rate background environment caused by the open nature of the spectrometer with a direct line of sight from tracking detectors to the target. Early analysis details for cuts and corrections needed for GEn extraction under these high-rate conditions at all Q² points will be presented.