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Ali CMB Polarization Telescope (AliCPT-1) is the first CMB degree-scalepolarimeter to be deployed on the Tibetan plateau at 5,250m above sea level.AliCPT-1 is a 90/150 GHz 72 cm aperture, two-lens refracting telescope cooleddown to 4 K. Alumina lenses, 800mm in diameter, image the CMB in a 33.4{\deg}field of view on a 636mm wide focal plane. The modularized focal plane consistsof dichroic polarization-sensitive Transition-Edge Sensors (TESes). Each moduleincludes 1,704 optically active TESes fabricated on a 150mm diameter siliconwafer. Each TES array is read out with a microwave multiplexing readout systemcapable of a multiplexing factor up to 2,048. Such a large multiplexing factorhas allowed the practical deployment of tens of thousands of detectors,enabling the design of a receiver that can operate up to 19 TES arrays for atotal of 32,376 TESes. AliCPT-1 leverages the technological advancements in thedetector design from multiple generations of previously successfulfeedhorn-coupled polarimeters, and in the instrument design from BICEP-3, butapplied on a larger scale. The cryostat receiver is currently under integrationand testing. During the first deployment year, the focal plane will bepopulated with up to 4 TES arrays. Further TES arrays will be deployed in thefollowing years, fully populating the focal plane with 19 arrays on the fourthdeployment year. Here we present the AliCPT-1 receiver design, and how thedesign has been optimized to meet the experimental requirements.

The design of the Ali CMB Polarization Telescope receiver