Harnessing the whole power of CMB Lensing with the Atacama Cosmology Telescope

Weak gravitational lensing of the CMB has been established as a robust and powerful observable for precision cosmology. By mapping the matter distribution, it provides a clean window to measure structure growth and key cosmological parameters such as the neutrino mass. In this talk, I will present the major improvements to the Atacama Cosmology Telescope lensing measurement following the latest public data release (DR6). In particular, I will discuss both the inclusion of DR6 data collected during the day (which has never before been used in any lensing analysis) and the prospect of accessing wider sky areas thanks to Galactic foreground mitigation strategies. These improvements will dramatically increase the forecasted power of CMB lensing measurements with the Simons Observatory.