QUBIC VIII: Optical design and performance

O'SULLIVAN, C.; DE PETRIS, M.; AMICO, G.; BATTISTELLI, E.S.; DE BERNARDIS, P.; BURKE, D.; BUZI, D.; CHAPRON, C.; CONVERSI, L.; D'ALESSANDRO, G.; DE LEO, M.; GAYER, D.; GRANDSIRE, L.; HAMILTON, J.-CH.; MARNIEROS, S.; MASI, S.; MATTEI, A.; MENNELLA, A.; MOUSSET, L.; MURPHY, J.D.; PELOSI, A.; PERCIBALLI, M.; PIAT, M.; SCULLY, S.; TARTARI, A.; TORCHINSKY, S.A.; VOISIN, F.; ZANNONI, M.; ZULLO, A.; ADE, P.; ALBERRO, J.G.; ALMELA, A.; ARNALDI, L.H.; AUGUSTE, D.; AUMONT, J.; AZZONI, S.; BANFI, S.; BAÙ, A.; BÉLIER, B.; BENNETT, D.; BERGÉ, L.; BERNARD, J.-PH.; BERSANELLI, M.; BIGOT-SAZY, M.-A.; BONAPARTE, J.; BONIS, J.; BUNN, E.; CAVALIERE, F.; CHANIAL, P.; CHARLASSIER, R.; COBOS CERUTTI, A.C.; COLUMBRO, F.; COPPOLECCHIA, A.; DE GASPERIS, G.; DHEILLY, S.; DUCA, C.; DUMOULIN, L.; ETCHEGOYEN, A.; FASCISZEWSKI, A.; FERREYRO, L.P.; FRACCHIA, D.; FRANCESCHET, C.; GAMBOA LERENA, M.M.; GANGA, K.M.; GARCÍA, B.; GARCÍA REDONDO, M.E.; GASPARD, M.; GERVASI, M.; GIARD, M.; GILLES, V.; GIRAUD-HERAUD, Y.; GÓMEZ BERISSO, M.; GONZÁLEZ

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS

IOP PUBLISHING LTD

Año: 2022 vol. 2022

1475-7516

The Q and U Bolometric Interferometer for Cosmology (QUBIC) is a ground-based experiment that aims to detect B-mode polarization anisotropies [1] in the CMB at angular scales around the â.,"≃100 recombination peak. Systematic errors make ground-based observations of B modes at millimetre wavelengths very challenging and QUBIC mitigates these problems in a somewhat complementary way to other existing or planned experiments using the novel technique of bolometric interferometry. This technique takes advantage of the sensitivity of an imager and the systematic error control of an interferometer. A cold reflective optical combiner superimposes the re-emitted beams from 400 aperture feedhorns on two focal planes. A shielding system composed of a fixed groundshield, and a forebaffle that moves with the instrument, limits the impact of local contaminants. The modelling, design, manufacturing and preliminary measurements of the optical components are described in this paper.