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 1a.,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.
Original language | English |
---|---|
Title of host publication | Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI |
Editors | Jonas Zmuidzinas, Jian-Rong Gao |
Publisher | SPIE |
ISBN (Electronic) | 9781510653610 |
DOIs | |
Publication status | Published - 31 Aug 2022 |
Event | Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI 2022 - Montreal, Canada Duration: 17 Jul 2022 → 22 Jul 2022 |
Publication series
Name | Proceedings of SPIE - The International Society for Optical Engineering |
---|---|
Volume | 12190 |
ISSN (Print) | 0277-786X |
ISSN (Electronic) | 1996-756X |
Conference
Conference | Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI 2022 |
---|---|
Country/Territory | Canada |
City | Montreal |
Period | 17/07/22 → 22/07/22 |
Bibliographical note
Funding Information:‡“Sviluppi tecnologici nel millimetrico per missioni di polarizzazione” funded by the Italian Space Agency (ASI), 2009
Funding Information:
LiteBIRD (phase A) activities are supported by the following funding agencies: ISAS/JAXA, MEXT, JSPS, KEK (Japan); CSA (Canada); CNES, CNRS, CEA (France); DFG (Germany); ASI, INFN, INAF (Italy); RCN (Norway); AEI (Spain); SNSA, SRC (Sweden); NASA, DOE (USA).
Publisher Copyright:
© 2022 SPIE.
Other keywords
- Cosmic Microwave Background polarization
- LiteBIRD
- Microwave optical sub-system testing
- Microwave optics modeling
- Space mission for CMB polarization