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The Simons Observatory (SO) will be a cosmic microwave background (CMB)survey experiment with three small-aperture telescopes and one large-aperturetelescope, which will observe from the Atacama Desert in Chile. In total, SOwill field over 60,000 transition-edge sensor (TES) bolometers in six spectralbands centered between 27 and 280 GHz in order to achieve the sensitivitynecessary to measure or constrain numerous cosmological quantities, as outlinedin The Simons Observatory Collaboration et al. (2019). The 6~m Large ApertureTelescope (LAT), which will target the smaller angular scales of the CMB,utilizes a cryogenic receiver (LATR) designed to house up to 13 individualoptics tubes. Each optics tube is comprised of three silicon lenses, IRblocking filters, and three dual-polarization, dichroic TES detector wafers.The scientific objectives of the SO project require these optics tubes toachieve high-throughput optical performance while maintaining exquisite controlof systematic effects. We describe the integration and testing program for theSO LATR optics tubes that will verify the design and assembly of the opticstubes before they are shipped to the SO site and installed in the LATRcryostat. The program includes a quick turn-around test cryostat that is usedto cool single optics tubes and validate the cryogenic performance and detectorreadout assembly. We discuss the optical design specifications the optics tubesmust meet to be deployed on sky and the suite of optical test equipment that isprepared to measure these requirements.

The Integration and Testing Program for the Simons Observatory Large Aperture Telescope Optics Tubes