Experimental radio cosmology

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The C-Band All-Sky Survey (C-BASS): new constraints on the integrated radio spectrum of M 31

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 523:3 (2023) 3471-3486

Authors:

Stuart E Harper, Adam Barr, C Dickinson, MW Peel, Roke Cepeda-Arroita, CJ Copley, RDP Grumitt, J Patrick Leahy, JL Jonas, Michael E Jones, J Leech, TJ Pearson, ACS Readhead, Angela C Taylor
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Correction to: The C-Band All-Sky Survey (C-BASS): template fitting of diffuse galactic microwave emission in the northern sky

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 522:1 (2023) 151-151
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The C-Band All-Sky Survey (C-BASS): New Constraints on the Integrated Radio Spectrum of M 31

ArXiv 2304.03875 (2023)

Authors:

Stuart E Harper, Adam Barr, C Dickinson, MW Peel, Roke Cepeda-Arroita, CJ Copley, RDP Grumitt, J Patrick Leahy, JL Jonas, Michael E Jones, J Leech, TJ Pearson, ACS Readhead, Angela C Taylor
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Sensitivity modeling for LiteBIRD

Journal of Low Temperature Physics Springer Nature 211:5-6 (2022) 384-397

Authors:

T Hasebe, Par Ade, A Adler, E Allys, David Alonso, K Arnold, D Auguste, J Aumont, R Aurlien, J Austermann, Susanna Azzoni, C Baccigalupi, Aj Banday, R Banerji, Rb Barreiro, N Bartolo, S Basak, E Battistelli, L Bautista, J Beall, D Beck, S Beckman, K Benabed, J Bermejo-Ballesteros, M Bersanelli, J Bonis, J Borrill, F Bouchet, F Boulanger, S Bounissou, M Brilenkov, Ml Brown, M Bucher, E Calabrese, M Calvo, P Campeti, A Carones, Fj Casas, A Catalano, A Challinor, V Chan, K Cheung, Y Chinone, J Cliche, F Columbro

Abstract:

LiteBIRD is a future satellite mission designed to observe the polarization of the cosmic microwave background radiation in order to probe the inflationary universe. LiteBIRD is set to observe the sky using three telescopes with transition-edge sensor bolometers. In this work we estimated the LiteBIRD instrumental sensitivity using its current design. We estimated the detector noise due to the optical loadings using physical optics and ray-tracing simulations. The noise terms associated with thermal carrier and readout noise were modeled in the detector noise calculation. We calculated the observational sensitivities over fifteen bands designed for the LiteBIRD telescopes using assumed observation time efficiency.
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Optical characterization of OMT-coupled TES bolometers for LiteBIRD

Journal of Low Temperature Physics Springer Nature 209:3-4 (2022) 396-408

Authors:

J Hubmayr, Par Ade, A Adler, E Allys, D Alonso, K Arnold, D Auguste, J Aumont, R Aurlien, Je Austermann, S Azzoni, C Baccigalupi, Aj Banday, R Banerji, Rb Barreiro, N Bartolo, S Basak, E Battistelli, L Bautista, Ja Beall, D Beck, S Beckman, K Benabed, J Bermejo-Ballesteros, M Bersanelli, J Bonis, J Borrill, F Bouchet, F Boulanger, S Bounissou, M Brilenkov, Ml Brown, M Bucher, E Calabrese, M Calvo, P Campeti, A Carones, Fj Casas, A Catalano, A Challinor, V Chan, K Cheung, Y Chinone, C Chiocchetta, Se Clark, L Clermont, S Clesse, J Cliche, F Columbro, Ja Connors

Abstract:

Feedhorn- and orthomode transducer- (OMT) coupled transition edge sensor (TES) bolometers have been designed and micro-fabricated to meet the optical specifications of the LiteBIRD high frequency telescope (HFT) focal plane. We discuss the design and optical characterization of two LiteBIRD HFT detector types: dual-polarization, dual-frequency-band pixels with 195/280 GHz and 235/337 GHz band centers. Results show well-matched passbands between orthogonal polarization channels and frequency centers within 3% of the design values. The optical efficiency of each frequency channel is conservatively reported to be within the range 0.64 - 0.72, determined from the response to a cryogenic, temperature-controlled thermal source. These values are in good agreement with expectations and either exceed or are within 10% of the values used in the LiteBIRD sensitivity forecast. Lastly, we report a measurement of loss in Nb/SiNx/Nb microstrip at 100 mK and over the frequency range 200–350 GHz, which is comparable to values previously reported in the literature.
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