Systematic effects induced by half-wave plate differential optical load and TES nonlinearity for LiteBIRD

Silvia Micheli; Tijmen de Haan; Tommaso Ghigna; Alessandro Novelli; Francesco Piacentini; Giampaolo Pisano; Fabio Columbro; Alessandro Coppolecchia; Giuseppe D'Alessandro; Paolo de Bernardis; Luca Lamagna; Elisabetta Marchitelli; Silvia Masi; Andrea Occhiuzzi; Alessandro Paiella

doi:10.1117/12.3018553

16 August 2024 Systematic effects induced by half-wave plate differential optical load and TES nonlinearity for LiteBIRD

Silvia Micheli, Tijmen de Haan, Tommaso Ghigna, Alessandro Novelli, Francesco Piacentini, Giampaolo Pisano, Fabio Columbro, Alessandro Coppolecchia, Giuseppe D'Alessandro, Paolo de Bernardis, Luca Lamagna, Elisabetta Marchitelli, Silvia Masi, Andrea Occhiuzzi, Alessandro Paiella

Author Affiliations +

Proceedings Volume 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII; 131022R (2024) https://doi.org/10.1117/12.3018553
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

LiteBIRD, a forthcoming satellite mission, aims to measure the polarization of the Cosmic Microwave Background (CMB) across the entire sky. The experiment will employ three telescopes, Transition-Edge Sensor (TES) bolometers and rotating Half-Wave Plates (HWPs) at cryogenic temperatures to ensure high sensitivity and systematic effects mitigation. This study is focused on the Mid- and High-Frequency Telescopes (MHFT), which will use rotating metal mesh HWPs. We investigate how power variations due to HWP differential emissivity and transmittance combine with TES nonlinear responsivity, resulting in an effective instrumental polarization. We present the results of simulations for the current HWP design, modeling the TES deviation from linearity as a second-order response. We quantify the level of acceptable residual nonlinearity assuming the mission requirement on the tensor-to-scalar ratio, δr < 0.001. Moreover, we provide an accuracy requirement on the measurement of TES responsivity nonlinearity level for MHFT channels. Lastly, we present possible mitigation methods that will be developed in future studies.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Silvia Micheli, Tijmen de Haan, Tommaso Ghigna, Alessandro Novelli, Francesco Piacentini, Giampaolo Pisano, Fabio Columbro, Alessandro Coppolecchia, Giuseppe D'Alessandro, Paolo de Bernardis, Luca Lamagna, Elisabetta Marchitelli, Silvia Masi, Andrea Occhiuzzi, and Alessandro Paiella "Systematic effects induced by half-wave plate differential optical load and TES nonlinearity for LiteBIRD", Proc. SPIE 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 131022R (16 August 2024); https://doi.org/10.1117/12.3018553

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