Setting requirements on out-of-band rejection for next-generation CMB experiments. Application to the LiteBIRD instrument
Abstract
Next-generation cosmic microwave background experiments have very stringent constraints to achieve the required sensitivity to target polarization B modes. In this work, we intend to set requirements on the out-of-band rejection level, with out-of-band referring to frequencies outside the telescope band-pass. The method developed is applied to the LiteBIRD Medium and High Frequency Telescopes. In order to determine the impact of out-of-band power, we model the instrument's optical response and the spectral emissions of the sky and of the instrument itself. This allows us to propagate optical power inside the telescope. Using this tool, we address both the impact of out-of-band power on the detection chain and on the thermal heat load, together with the impact on the process of separation between astrophysical components. The role of additional static power as well as dynamic power variations is studied. The requirement derived consist in attenuation factors (in dB) in frequency subdomains. They will be used to design the telescopes filters.
Versions
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BibTeX
@misc{mousset2026setting,
title = {{Setting requirements on out-of-band rejection for next-generation CMB experiments. Application to the LiteBIRD instrument}},
author = {L. Mousset and L. Montier and J. Aumont and F. Columbro and P. de Bernardis and J. Errard and C. Franceschet and S. Giardiello and T. Ghigna and H. Hubmayr and G. Jaehnig and S. Masi and F. Piacentini and G. Pisano and A. Rizzieri and G. Savini and C. Tucker and LiteBIRD Collaboration},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.31778},
eprint = {2606.31778},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.31778},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Setting requirements on out-of-band rejection for next-generation CMB experiments. Application to the LiteBIRD instrument
AU - L. Mousset
AU - L. Montier
AU - J. Aumont
AU - F. Columbro
AU - P. de Bernardis
AU - J. Errard
AU - C. Franceschet
AU - S. Giardiello
AU - T. Ghigna
AU - H. Hubmayr
AU - G. Jaehnig
AU - S. Masi
AU - F. Piacentini
AU - G. Pisano
AU - A. Rizzieri
AU - G. Savini
AU - C. Tucker
AU - LiteBIRD Collaboration
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2606.31778
UR - https://arxiv.org/abs/2606.31778
AB - Next-generation cosmic microwave background experiments have very stringent constraints to achieve the required sensitivity to target polarization B modes. In this work, we intend to set requirements on the out-of-band rejection level, with out-of-band referring to frequencies outside the telescope band-pass. The method developed is applied to the LiteBIRD Medium and High Frequency Telescopes. In order to determine the impact of out-of-band power, we model the instrument's optical response and the spectral emissions of the sky and of the instrument itself. This allows us to propagate optical power inside the telescope. Using this tool, we address both the impact of out-of-band power on the detection chain and on the thermal heat load, together with the impact on the process of separation between astrophysical components. The role of additional static power as well as dynamic power variations is studied. The requirement derived consist in attenuation factors (in dB) in frequency subdomains. They will be used to design the telescopes filters.
ER -