  We present measurements of AC-LGADs performed at the Fermilab's test beam
facility using 120 GeV protons. We studied the performance of various strip and
pad AC-LGAD sensors that were produced by BNL and HPK. The measurements are
performed with our upgraded test beam setup that utilizes a high precision
telescope tracker, and a simultaneous readout of up to 7 channels per sensor,
which allows detailed studies of signal sharing characteristics. These
measurements allow us to assess the differences in designs between different
manufacturers, and optimize them based on experimental performance. We then
study several reconstruction algorithms to optimize position and time
resolutions that utilize the signal sharing properties of each sensor. We
present a world's first demonstration of silicon sensors in a test beam that
simultaneously achieve better than 6-10 micron position and 30 ps time
resolution. This represents a substantial improvement to the spatial resolution
than would be obtained with binary readout of sensors with similar pitch.
