Simons Observatory Microwave SQUID Multiplexing Readout -- Cryogenic RF Amplifier and Coaxial Chain Design

Abstract

The Simons Observatory (SO) is an upcoming polarization-sensitive Cosmic Microwave Background (CMB) experiment on the Cerro Toco Plateau (Chile) with large overlap with other optical and infrared surveys (e.g., DESI, LSST, HSC). To enable the readout of \bigO(10,000) detectors in each of the four telescopes of SO, we will employ the microwave SQUID multiplexing technology. With a targeted multiplexing factor of \bigO{(1,000)}, microwave SQUID multiplexing has never been deployed on the scale needed for SO. Here we present the design of the cryogenic coaxial cable and RF component chain that connects room temperature readout electronics to superconducting resonators that are coupled to Transition Edge Sensor bolometers operating at sub-Kelvin temperatures. We describe design considerations including cryogenic RF component selection, system linearity, noise, and thermal power dissipation.

10 pages, 2 figures

References in corpus (8)

• The Simons Observatory: Science goals and forecasts
• Advanced ACTPol Cryogenic Detector Arrays and Readout
• A semi-empirical model for two-level system noise in superconducting microresonators
• A readout for large arrays of Microwave Kinetic Inductance Detectors
• The Simons Observatory: Instrument Overview
• Microwave SQUID Multiplexer demonstration for Cosmic Microwave Background Imagers
• Highly-multiplexed microwave SQUID readout using the SLAC Microresonator Radio Frequency (SMuRF) Electronics for Future CMB and Sub-millimeter Surveys
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Cited by in corpus (11)

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• The Simons Observatory Large Aperture Telescope Receiver
• Small Aperture Telescopes for the Simons Observatory
• The Simons Observatory 220 and 280 GHz Focal-Plane Module: Design and Initial Characterization
• Assembly development for the Simons Observatory focal plane readout module
• The Simons Observatory: Magnetic Sensitivity Measurements of Microwave SQUID Multiplexers
• Simons Observatory Focal-Plane Module: In-lab Testing and Characterization Program
• Demonstration of a 1820 channel multiplexer for transition-edge sensor bolometers
• The Integration and Testing Program for the Simons Observatory Large Aperture Telescope Optics Tubes
• Flux ramp modulation based hybrid microwave SQUID multiplexer
• The Simons Observatory: Design, Optimization, and Performance of Low Frequency Detectors