Optical modelling and analysis of the Q and U bolometric interferometer for cosmology

D. Burke, D. Gayer, E. Kalinauskaite, C. O'Sullivan, J. D. Murphy, S. P. Scully, M. De Petris, M. De Leo, A. Mennella, S. A. Torchinsky, M. Zannoni, G. Amico, D. Auguste, J. Aumont, S. Banfi, G. Barbarán, P. Battaglia, E. Battistelli, A. Baù, B. BélierD. G. Bennett, L. Bergé, J. Ph Bernard, M. Bersanelli, M. A. Bigot-Sazy, N. Bleurvac, J. Bonaparte, J. Bonis, G. Bordier, E. Bréelle, E. F. Bunn, D. Buzi, A. Buzzelli, F. Cavaliere, P. Chanial, C. Chapron, R. Charlassier, F. Columbro, G. Coppi, A. Coppolecchia, F. Couchot, G. D'Alessandro, R. D'Agostino, P. De Bernardis, G. De Gasperis, A. Di Donato, A. A. Drilien, Louis Dumoulin, A. Etchegoyen, A. Fasciszewski, C. Franceschet, M. Gamboa-Lerena, B. García, X. Garrido, M. Gaspard, A. Gault, M. Gervasi, M. Giard, Y. Giraud-Héraud, M. Gómez Berisso, M. González, M. L. Gradziel, L. Grandsire, E. Guerrard, J. Ch Hamilton, D. Harari, V. Haynes, S. Henrot-Versillé, D. T. Hoang, N. Holtzer, F. Incardona, E. Jules, J. Kaplan, A. L. Korotkov, C. Kristukat, L. Lamagna, J. Lande, S. Loucatos, T. Louis, A. Lowitz, V. Lukovic, R. Luterstein, Bruno Maffei, S. Marnieros, S. Masi, A. Mattei, A. J. May, M. A. McCulloch, M. C. Medina, L. Mele, S. J. Melhuish, L. Mundo, L. Montier, J. A. Murphy, D. Néel, E. Olivieri, A. Paiella, F. Pajot, A. Passerini, H. Pastoriza, A. Pelosi, C. Perbost, O. Perdereau, F. Pezzotta, F. Piacentini, M. R. Piat, L. Piccirillo, G. Pisano, G. Polenta, D. Prêle, R. Puddu, D. Rambaud, O. Rigaut, P. Ringegni, G. E. Romero, M. Salatino, A. Schillaci, C. G. Scóccola, S. M. Spinelli, M. Stolpovskiy, F. Suarez, A. Tartari, J. P. Thermeau, P. T. Timbie, M. Tristram, V. Truongcanh, G. S. Tucker, C. E. Tucker, D. Viganò, N. Vittorio, F. Voisin, B. Watson, F. Wicek, A. Zullo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


Remnant radiation from the early universe, known as the Cosmic Microwave Background (CMB), has been redshifted and cooled, and today has a blackbody spectrum peaking at millimetre wavelengths. The QUBIC (Q&U Bolometric Interferometer for Cosmology) instrument is designed to map the very faint polaristion structure in the CMB. QUBIC is based on the novel concept of bolometric interferometry in conjunction with synthetic imaging. It will have a large array of input feedhorns, which creates a large number of interferometric baselines. The beam from each feedhorn is passed through an optical combiner, with an off-axis compensated Gregorian design, to allow the generation of the synthetic image. The optical-combiner will operate in two frequency bands (150 and 220 GHz with 25% and 18.2 % bandwidth respectively) while cryogenically cooled TES bolometers provide the sensitivity required at the image plane. The QUBIC Technical Demonstrator (TD), a proof of technology instrument that contains 64 input feed-horns, is currently being built and will be installed in the Alto Chorrillos region of Argentina. The plan is then for the full QUBIC instrument (400 feed-horns) to be deployed in Argentina and obtain cosmologically significant results. In this paper we will examine the output of the manufactered feed-horns in comparison to the nominal design. We will show the results of optical modelling that has been performed in anticipation of alignment and calibration of the TD in Paris, in particular testing the validity of real laboratory environments. We show the output of large calibrator sources (50 ° full width haf max Gaussian beams) and the importance of accurate mirror definitions when modelling large beams. Finally we describe the tolerance on errors of the position and orientation of mirrors in the optical combiner.

Original languageEnglish (US)
Title of host publicationTerahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI
EditorsLaurence P. Sadwick, Tianxin Yang
ISBN (Electronic)9781510615472
StatePublished - 2018
Externally publishedYes
Event2017 Conference on Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI - San Francisco, United States
Duration: Jan 29 2018Feb 1 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Conference2017 Conference on Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI
Country/TerritoryUnited States
CitySan Francisco

Bibliographical note

Publisher Copyright:
© 2018 SPIE.


  • B-modes
  • bolometric interferometry
  • CMB
  • Cosmology
  • Optical Modelling
  • Polarisation
  • Simulation


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