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The Simons Observatory (SO) will detect and map the temperature andpolarization of the millimeter-wavelength sky from Cerro Toco, Chile across arange of angular scales, providing rich data sets for cosmological andastrophysical analysis. The SO focal planes will be tiled with compacthexagonal packages, called Universal Focal-plane Modules (UFMs), in which thetransition-edge sensor (TES) detectors are coupled to 100 mKmicrowave-multiplexing electronics. Three different types of dichroic TESdetector arrays with bands centered at 30/40, 90/150, and 220/280 GHz will beimplemented across the 49 planned UFMs. The 90/150GHz and 220/280 GHz arrayseach contain 1,764 TESes, which are read out with two 910x multiplexercircuits. The modules contain a series of densely routed silicon chips, whichare packaged together in a controlled electromagnetic environment with robustheat-sinking to 100 mK. Following an overview of the module design, we reporton early results from the first 220/280GHz UFM, including detector yield, aswell as readout and detector noise levels.

The Simons Observatory 220 and 280 GHz Focal-Plane Module: Design and Initial Characterization