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

Abstract

The Simons Observatory (SO) will detect and map the temperature and polarization of the millimeter-wavelength sky from Cerro Toco, Chile across a range of angular scales, providing rich data sets for cosmological and astrophysical analysis. The SO focal planes will be tiled with compact hexagonal packages, called Universal Focal-plane Modules (UFMs), in which the transition-edge sensor (TES) detectors are coupled to 100 mK microwave-multiplexing electronics. Three different types of dichroic TES detector arrays with bands centered at 30/40, 90/150, and 220/280 GHz will be implemented across the 49 planned UFMs. The 90/150GHz and 220/280 GHz arrays each contain 1,764 TESes, which are read out with two 910x multiplexer circuits. The modules contain a series of densely routed silicon chips, which are packaged together in a controlled electromagnetic environment with robust heat-sinking to 100 mK. Following an overview of the module design, we report on early results from the first 220/280GHz UFM, including detector yield, as well as readout and detector noise levels.

8 pages, 3 figures

References in corpus (4)

• A Microwave SQUID Multiplexer Optimized for Bolometric Applications
• The Simons Observatory microwave SQUID multiplexing detector module design
• The Simons Observatory Large Aperture Telescope Receiver
• Assembly development for the Simons Observatory focal plane readout module

Cited by in corpus (6)

• Demonstration of a 1820 channel multiplexer for transition-edge sensor bolometers
• The Simons Observatory: Studies of Detector Yield and Readout Noise From the First Large-Scale Deployment of Microwave Multiplexing at the Large Aperture Telescope
• The Simons Observatory: Design, Optimization, and Performance of Low Frequency Detectors
• The Simons Observatory: Dark Characterization of the Large Aperture Telescope
• The Simons Observatory: Design, Integration, and Current Status of Small Aperture Telescopes
• The Simons Observatory: Studies of Phase Drift in RF Transmission Lines from the First Large-Scale Deployment of Microwave Frequency Multiplexing for Cosmology