A polarization modulator unit for the mid- and high-frequency telescopes of the LiteBIRD mission

Fabio Columbro; Paolo de Bernardis; Luca Lamagna; Silvia Masi; Alessandro Paiella; Francesco Piacentini; Giampaolo Pisano

doi:10.1117/12.2577818

13 December 2020 A polarization modulator unit for the mid- and high-frequency telescopes of the LiteBIRD mission

Fabio Columbro, Paolo de Bernardis, Luca Lamagna, Silvia Masi, Alessandro Paiella, Francesco Piacentini, Giampaolo Pisano

Author Affiliations +

Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 114436Z (2020) https://doi.org/10.1117/12.2577818
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

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Abstract

The LiteBIRD mission is a JAXA strategic L-class mission for all sky CMB surveys which will be launched in the 2020s. The main target of the mission is the detection of primordial gravitational waves with a sensitivity of the tensor-to-scalar ratio δr<0.001. The polarization modulator unit (PMU) represents a critical and powerful component to suppress 1/f noise contribution and mitigate systematic uncertainties induced by detector gain drift, both for the high-frequency telescope (HFT) and for the mid-frequency telescope (MFT). Each PMU is based on a continuously-rotating transmissive half-wave plate (HWP) held by a superconducting magnetic bearing in a 5K environment. In this contribution we will present the design and expected performance of the LiteBIRD PMUs and testing performed on every PMU subsystem with a room-temperature rotating disk used as a stand-in for the cryogenic HWP rotor.

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Citation Download Citation

Fabio Columbro, Paolo de Bernardis, Luca Lamagna, Silvia Masi, Alessandro Paiella, Francesco Piacentini, and Giampaolo Pisano "A polarization modulator unit for the mid- and high-frequency telescopes of the LiteBIRD mission", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 114436Z (13 December 2020); https://doi.org/10.1117/12.2577818

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