Development of frequency domain multiplexing readout using sub-kelvin SQUIDs for LiteBIRD

Megan Russell; Kam Arnold; Tucker Elleflot; Tijmen de Haan; Johannes Hubmayr; Greg Jaehnig; Adrian Lee; Joshua Montgomery; Aritoki Suzuki

doi:10.1117/12.2630316

31 August 2022 Development of frequency domain multiplexing readout using sub-kelvin SQUIDs for LiteBIRD

Megan Russell, Kam Arnold, Tucker Elleflot, Tijmen de Haan, Johannes Hubmayr, Greg Jaehnig, Adrian Lee, Joshua Montgomery, Aritoki Suzuki

Author Affiliations +

Proceedings Volume 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; 1219027 (2022) https://doi.org/10.1117/12.2630316
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

LiteBIRD is a satellite mission designed to map the polarization of the Cosmic Microwave Background (CMB) at degree and larger scales from 40 to 402 GHz. LiteBIRD will use 4,600 Transition-Edge Sensor (TES) bolometers biased and read out using Digital Frequency Domain Multiplexing (DfMux). The DfMux implementation for LiteBIRD uses sub-kelvin Superconducting Quantum Interference Device (SQUID) at the same 0.1 K thermal stage as the detectors, this allows for reduced parasitic impedances within the mK circuit and improved SQUID performance. Additionally it must work in the integrated system with the spacecraft’s wiring harnesses, which will be longer than is typical on similar ground based experiments, and therefore have more significant parasitic impedances which will impact readout performance. The properties of SQUID candidates at millikelvin temperatures and effects of the spacecraft-like meter scale wiring harness are investigated. Additionally, the possibility of inductively rather than resistively biasing our bolometers at the 0.1K stage, to reduce power dissipation in the bias element, is investigated. We will report progress on validating the cryogenic components of this readout system.

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Megan Russell, Kam Arnold, Tucker Elleflot, Tijmen de Haan, Johannes Hubmayr, Greg Jaehnig, Adrian Lee, Joshua Montgomery, and Aritoki Suzuki "Development of frequency domain multiplexing readout using sub-kelvin SQUIDs for LiteBIRD", Proc. SPIE 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, 1219027 (31 August 2022); https://doi.org/10.1117/12.2630316

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