A Microwave SQUID Multiplexer Optimized for Bolometric Applications

Abstract

A microwave SQUID multiplexer ($\mu$MUX) has been optimized for coupling to large arrays of superconducting transition-edge sensor (TES) bolometers. We present the scalable cryogenic multiplexer chip design in a 1820-channel multiplexer configuration for the 4-8 GHz rf band. The key metrics of yield, sensitivity, and crosstalk are determined through measurements of 455 readout channels, which span 4-5 GHz. The median white-noise level is 45 pA/$\sqrt{\text{Hz}}$, evaluated at 2 Hz, with a 1/f knee $\le$ 20 mHz after common-mode subtraction. The white-noise level decreases the sensitivity of a TES bolometer optimized for detection of the cosmic microwave background at 150 GHz by only 3%. The measured crosstalk between any channel pair is $\le$ 0.3%.

arXiv comment6 pages, 5 figures

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Cited by in corpus (17)

• The Simons Observatory microwave SQUID multiplexing detector module design
• The Simons Observatory Large Aperture Telescope Receiver
• SLAC Microresonator RF (SMuRF) Electronics: A tone-tracking readout system for superconducting microwave resonator arrays
• Transition Edge Sensors: Physics and Applications
• Instrumental systematics biases in CMB lensing reconstruction: a simulation-based assessment
• The Simons Observatory 220 and 280 GHz Focal-Plane Module: Design and Initial Characterization
• The Simons Observatory: the Large Aperture Telescope (LAT)
• Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier
• Crosstalk effects in microwave SQUID multiplexed TES bolometer readout
• Demonstration of a 1820 channel multiplexer for transition-edge sensor bolometers
• The Simons Observatory: Magnetic Shielding Measurements for the Universal Multiplexing Module
• Bandwidth and Aliasing in the Microwave SQUID Multiplexer
• The Simons Observatory: Studies of Detector Yield and Readout Noise From the First Large-Scale Deployment of Microwave Multiplexing at the Large Aperture Telescope
• Light Dark Matter Detection with Hydrogen-rich Crystals and Low-Tc TES Detectors
• The Simons Observatory: Large-Scale Characterization of 90/150 GHz TES Detector Modules
• The Simons Observatory: Dark Characterization of the Large Aperture Telescope
• The Simons Observatory: Studies of Phase Drift in RF Transmission Lines from the First Large-Scale Deployment of Microwave Frequency Multiplexing for Cosmology