In order to rule out competing evolutionary models of the universe and better constrain cosmological parameters including the primordial baryon density, the Hubble constant, and the growth of structure in our universe, more sensitive ground-based telescopes are needed for surveying the Cosmic Microwave Background (CMB). In response to this call, the Simons Observatory (SO) has developed a 6-m Large Aperture Telescope (LAT) to study the CMB from the Chilean Andes. Mapping nearly 40% of the sky at arcminute angular resolution with a noise level of 6 uK-arcmin, the LAT will be the most sensitive CMB survey instrument to-date. The LAT houses the 2.4-m diameter Large Aperture Telescope Receiver (LATR), the largest cryogenic receiver built for studying the CMB. The LATR will house over 62,000 Transition Edge Sensor (TES) detectors operating at 100 mK and sensitive to frequencies between 27 GHz and 280 GHz. Nearly a decade of research, design and testing work went into developing the telescope and its receiver, which are currently deployed in Chile. In this talk, I will present an overview of the project's scientific motivations and the design drivers behind the telescope and receiver along with an in-depth look into the final receiver design and its current status.
