Progress toward measuring the electron EDM in a cryogenic beam of polar molecules*

We report on the progress of the ACME Collaboration experiment to measure the electric dipole moment (EDM) of the electron using thorium monoxide. We have demonstrated a statistical sensitivity of $1 \times 10^{-28}$ $\mathrm{e \cdot cm}$ in one day of averaging time. We discuss our studies of several potential sources of systematic error, various apparatus diagnostics, and improvements in the measurement and data analysis scheme.