Vector Analyzing Power Measurements During PREX-II

I report on various 1 GeV measurements of the vector analyzing power $A_{n}$ on spin-0 during PREX-II at $$ =  0.0064 $(\frac{GeV}{c})^{2}$ and $<\theta>$ = $5^{o}$. The PREX-II experiment at Jefferson Lab measured the parity-violating (PV) asymmetry of elastically scattered longitudinally polarized electrons off an unpolarized $^{208}{Pb}$ target. The analyzing power couples to any residual transverse beam polarization thus making it a potential source of systematic error. Dedicated $A_{n}$ measurements were taken highlighted by the first $A_{n}$ measurement on an intermediate Z nuclei, $^{40}{Ca}$. The $^{40}{Ca}$ measurement is interesting as it provides input on the Z dependence of the analyzing power. Additional measurements on $^{208}{Pb}$ and $^{12}{C}$ were taken with the latter being taken since the lead target is sandwiched between two diamond foils.