Speaker
Description
Nucleon electromagnetic form factors offer insight into the internal structure of those nucleons. The Super Bigbite Spectrometer (SBS) program at Jefferson Lab conducts experiments measuring nucleon form factors at high Q$^2$ values. With the neutron’s electric form factor, G$^{n}_E$, previously measured to Q$^2$ = 3.4 GeV$^2$, GEn-II aimed to surpass this by up to roughly a factor of three. By colliding a polarized electron beam with a polarized $^3\text{He}$ target (with novel convection cell), GEn-II, measured the double spin asymmetry of the $e-n$ cross section in order to extract the form factor ratio G$^{n}_E$/G$^{n}_M$ at Q$^2$ values of 2.9, 6.6, and 9.7 GeV$^2$.
The changes in the target cell's geometry, along with an innovative experimental setup, allowed for higher beam currents coupled with high SEOP (Spin Exchange Optical Pumping) polarizations. These effects helped lead to luminosities previously unattainable in polarized $^3\text{He}$ experiments. This talk will cover target installation, the target system setup, as well as a general overview of the $^3\text{He}$ target performance during GEn-II.
