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Optical modeling for the LiteBIRD Medium and High Frequency Telescope
Lamagna, Luca; Franceschet, Cristian; De Petris, Marco et al.
2022In Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI
 

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Keywords :
LiteBIRD; Medium and High Frequency Telescope; Cosmic Microwave Background
Abstract :
[en] LiteBIRD is the next-generation space mission for polarization-sensitive mapping of the Cosmic Microwave Background anisotropies, with observations covering the full sky in a wide frequency range (34-448 GHz) to ensure high-precision removal of polarized foregrounds. Its main goal is to constrain the contribution of primordial gravitational waves to the curly component of the CMB polarization pattern. The LiteBIRD Medium and High Frequency Telescope (MHFT) will observe the sky in the 89-448 GHz band. Its optical configuration features two separate dual-lens assemblies with 300mm and 200mm apertures, 28° fields of view and diffraction-limited imaging over the whole spectral range. Polarization modulation is achieved through the continuous spinning of a half-wave plate at the optical entrance of each system. The optical studies for MHFT focus on a refined modeling of the telescope elements (lenses, anti-reflection coatings, absorbers, interfaces) to assess their individual effects on the predicted optical behavior of the telescopes. Such studies will provide key inputs for end-to-end simulations and will inform the subsystem and system-level characterization to meet the stringent requirements set for the LiteBIRD success. We describe the progress in MHFT optical modeling and the ongoing efforts to reproduce full Medium Frequency Telescope (MFT) and High Frequency Telescope (HFT) beams for representative focal plane pixels down to the far-sidelobe angular region. Here, systematic effects due to challenging beam measurements and higher order optical coupling between the telescope and the surrounding structures are likely to affect the final level and shape of the beams and thus set compelling requirements for in-flight calibration and beam reconstruction.
Research center :
CSL - Centre Spatial de Liège - ULiège [BE]
STAR - Space sciences, Technologies and Astrophysics Research - ULiège [BE]
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Lamagna, Luca
Franceschet, Cristian
De Petris, Marco
Gudmundsson, Jon E.
Hargrave, Peter C.
Maffei, Bruno
Noviello, Fabio
O'Sullivan, Creidhe
Paiella, Alessandro
Columbro, Fabio
Austermann, Jason E.
Bersanelli, Marco
Chahadih, Abdallah
Cicuttin, Matteo  ;  Université de Liège - ULiège > Département d'électricité, électronique et informatique (Institut Montefiore) > Applied and Computational Electromagnetics (ACE)
Clermont, Lionel ;  Université de Liège - ULiège > Centres généraux > CSL (Centre Spatial de Liège)
De Bernardis, Paolo
Fleury-Frenette, Karl ;  Université de Liège - ULiège > Centres généraux > CSL (Centre Spatial de Liège)
Georges, Marc ;  Université de Liège - ULiège > Centres généraux > CSL (Centre Spatial de Liège)
Geuzaine, Christophe  ;  Université de Liège - ULiège > Département d'électricité, électronique et informatique (Institut Montefiore) > Applied and Computational Electromagnetics (ACE)
Hastanin, Juriy ;  Université de Liège - ULiège > Centres généraux > CSL (Centre Spatial de Liège)
Henrot-Versillé, Sophie
Hubmayr, Johannes
Jaehnig, Greg
Keskitalo, Reijo
Masi, Silvia
Matsuda, Frederick
Matsumura, Tomotake
Montier, Ludovic
Mot, Baptiste
Piacentini, Francesco
Pisano, Giampaolo
Plesseria, Jean Yves
Ritacco, Alessia
Savini, Giorgio
Shitvov, Alexei
Suzuki, Aritoki
Trappe, Neil
Winter, Berend
More authors (28 more) Less
Language :
English
Title :
Optical modeling for the LiteBIRD Medium and High Frequency Telescope
Publication date :
31 August 2022
Event name :
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI
Event organizer :
SPIE
Event place :
Montréal, Canada
Event date :
July 17-22, 2022
Audience :
International
Main work title :
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI
Publisher :
SPIE
Pages :
121901R
Available on ORBi :
since 02 December 2022

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