The optical bread-board models of the LiteBIRD Medium and High Frequency Telescope

Cristian Franceschet; Marco De Petris; Bruno Maffei; Sophie Bounissou; Luca Cintura; Marco Bersanelli; Jon E. Gudmundsson; Peter Hargrave; Luca Lamagna; Sabrina Realini; Alessia Ritacco

doi:10.1117/12.2629267

31 August 2022 The optical bread-board models of the LiteBIRD Medium and High Frequency Telescope

Cristian Franceschet, Marco De Petris, Bruno Maffei, Sophie Bounissou, Luca Cintura, Marco Bersanelli, Jon E. Gudmundsson, Peter Hargrave, Luca Lamagna, Sabrina Realini, Alessia Ritacco

Author Affiliations +

Proceedings Volume 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; 121901W (2022) https://doi.org/10.1117/12.2629267
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

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Abstract

In this paper we discuss the modeling, development and testing of the optical bread-board models of the Medium and High Frequency Telescope (MHFT) onboard the LiteBIRD satellite. The future JAXA mission LiteBIRD will search for the signature of primordial gravitational waves through the measurement of the “B-modes” of the cosmic microwave background polarization. MHFT will observe the polarized microwave sky between 89 and 448 GHz by means of two refractive telescopes. The accurate knowledge of their optical properties is fundamental to assess the impact of systematic effects (e.g. beam deformation, side lobes and intensity to polarization leakage) on the future observations. To gain early experience with our test approach, and to provide hints of possible criticalities in the design and characterization of a MHFT-like refractive system, we developed two optical bread-board models. The BB1, a single dielectric lens coupled to a fully characterized W-band corrugated horn, allows us to assess the accuracy and potential limitations of different measurement methods and to verify the reliability of optical simulators in predicting refractive elements and systems, as compared to the precision required by LiteBIRD. The BB2, a 1⁄2-scaled version of the Medium Frequency Telescope, focuses on the modelling and issues of dual-lens coupling, while providing a test-bed to finalize the MHFT optical calibration plan for its higher levels of integration.

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Cristian Franceschet, Marco De Petris, Bruno Maffei, Sophie Bounissou, Luca Cintura, Marco Bersanelli, Jon E. Gudmundsson, Peter Hargrave, Luca Lamagna, Sabrina Realini, and Alessia Ritacco "The optical bread-board models of the LiteBIRD Medium and High Frequency Telescope", Proc. SPIE 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, 121901W (31 August 2022); https://doi.org/10.1117/12.2629267

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