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Proceedings Paper

Optical design and modelling of the QUBIC instrument, a next-generation quasi-optical bolometric interferometer for cosmology
Author(s): S. Scully; D. Burke; C. O'Sullivan; D. Gayer; M. Gradziel; J. A. Murphy; M. De Petris; D. Buzi; M. Zannoni; A Mennella; M. Gervasi; A. Tartari; B. Maffei; J. Aumont; S. Banfi; P. Battaglia; E. S. Battistelli; A. Baù; B. Bélier; D. Bennet; L. Bergé; J.-Ph. Bernard; M. Bersanelli; M.-A. Bigot-Sazy; N. Bleurvacq; G. Bordier; J. Brossard; E. F. Bunn; D. Cammileri; F. Cavaliere; P. Chanial; C. Chapron; A. Coppolecchia; F. Couchot; G. D'Alessandro; P. De Bernardis; T. Decourcelle; F. Del Torto; L. Dumoulin; C. Franceschet; A. Gault; A. Ghribi; M. Giard; Y. Giraud-Héraud; L. Grandsire; J. Ch. Hamilton; V. Haynes; S. Henrot-Versillé; N. Holtzer; J. Kaplan; A. Korotkov; J. Lande; A. Lowitz; S. Marnieros; J. Martino; S. Masi; Mark McCulloch; Simon Melhuish; L. Montier; D. Néel; M. W. Ng; F. Pajot; A. Passerini; C. Perbost; O. Perdereau; F. Piacentini; M. Piat; L. Piccirillo; G. Pisano; D. Prêle; R. Puddu; D. Rambaud; O. Rigaut; M. Salatino; A. Schillaci; M. Stolpovskiy; P. Timbie; M. Tristram; G. Tucker; D. Viganò; F. Voisin; B. Watson
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Paper Abstract

Big Bang cosmologies predict that the cosmic microwave background (CMB) contains faint temperature and polarisation anisotropies imprinted in the early universe. ESA's PLANCK satellite has already measured the temperature anisotropies1 in exquisite detail; the next ambitious step is to map the primordial polarisation signatures which are several orders of magnitude lower. Polarisation E-modes have been measured2 but the even-fainter primordial B-modes have so far eluded detection. Their magnitude is unknown but it is clear that a sensitive telescope with exceptional control over systematic errors will be required. QUBIC3 is a ground-based European experiment that aims to exploit the novel concept of bolometric interferometry in order to measure B-mode polarisation anisotropies in the CMB. Beams from an aperture array of corrugated horns will be combined to form a synthesised image of the sky Stokes parameters on two focal planes: one at 150 GHz the other at 220 GHz. In this paper we describe recent optical modelling of the QUBIC beam combiner, concentrating on modelling the instrument point-spread-function and its operation in the 220-GHz band. We show the effects of optical aberrations and truncation as successive components are added to the beam path. In the case of QUBIC, the aberrations introduced by off-axis mirrors are the dominant contributor. As the frequency of operation is increased, the aperture horns allow up to five hybrid modes to propagate and we illustrate how the beam pattern changes across the 25% bandwidth. Finally we describe modifications to the QUBIC optical design to be used in a technical demonstrator, currently being manufactured for testing in 2016.

Paper Details

Date Published: 19 July 2016
PDF: 15 pages
Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99142S (19 July 2016); doi: 10.1117/12.2231717
Show Author Affiliations
S. Scully, National Univ. of Ireland, Maynooth (Ireland)
D. Burke, National Univ. of Ireland, Maynooth (Ireland)
C. O'Sullivan, National Univ. of Ireland, Maynooth (Ireland)
D. Gayer, National Univ. of Ireland, Maynooth (Ireland)
M. Gradziel, National Univ. of Ireland, Maynooth (Ireland)
J. A. Murphy, National Univ. of Ireland, Maynooth (Ireland)
M. De Petris, Sapienza Univ. di Roma (Italy)
D. Buzi, Sapienza Univ. di Roma (Italy)
M. Zannoni, Univ degli Studi di Milano-Bicocca (Italy)
A Mennella, Univ degli Studi di Milano (Italy)
M. Gervasi, Univ. degli Studi di Milano-Bicocca (Italy)
A. Tartari, Univ. Paris Diderot-Paris 7 (France)
B. Maffei, Institut d’Astrophysique Spatiale (France)
J. Aumont, Institut d’Astrophysique Spatiale (France)
S. Banfi, Univ. degli Studi di Milano-Bicocca (Italy)
P. Battaglia, Univ. degli Studi di Milano (Italy)
E. S. Battistelli, Sapienza Univ. di Roma (Italy)
A. Baù, Univ. degli Studi di Milano-Bicocca (Italy)
B. Bélier, Institut d’Electronique Fondamentale (France)
D. Bennet, National Univ. of Ireland, Maynooth (Ireland)
L. Bergé, Ctr. de Spectrométrie Nucléaire et de Spectrométrie de Masse (France)
J.-Ph. Bernard, Institut de Recherche en Astrophysique et Planétologie (France)
M. Bersanelli, Univ. degli Studi di Milano (Italy)
M.-A. Bigot-Sazy, Univ. Paris Diderot-Paris 7 (France)
N. Bleurvacq, Univ. Paris Diderot-Paris 7 (France)
G. Bordier, Univ. Paris Diderot-Paris 7 (France)
J. Brossard, Univ. Paris Diderot-Paris 7 (France)
E. F. Bunn, Univ. of Richmond (United States)
D. Cammileri, Univ. Paris Diderot-Paris 7 (France)
F. Cavaliere, Univ. degli Studi di Milano (Italy)
P. Chanial, Univ. Paris Diderot-Paris 7 (France)
C. Chapron, Univ. Paris Diderot-Paris 7 (France)
A. Coppolecchia, Sapienza Univ. di Roma (Italy)
F. Couchot, Lab. de l'Accélérateur Linéaire (France)
G. D'Alessandro, Sapienza Univ. di Roma (Italy)
P. De Bernardis, Sapienza Univ. di Roma (Italy)
T. Decourcelle, Univ. Paris Diderot-Paris 7 (France)
F. Del Torto, Univ. degli Studi di Milano (Italy)
L. Dumoulin, Ctr. de Spectrométrie Nucléaire et de Spectrométrie de Masse (France)
C. Franceschet, Univ. degli Studi di Milano (Italy)
A. Gault, Univ. of Wisconsin-Madison (United States)
A. Ghribi, Univ. Paris Diderot-Paris 7 (France)
M. Giard, Institut de Recherche en Astrophysique et Planétologie (France)
Y. Giraud-Héraud, Univ. Paris Diderot-Paris 7 (France)
L. Grandsire, Univ. Paris Diderot-Paris 7 (France)
J. Ch. Hamilton, Univ. Paris Diderot-Paris 7 (France)
V. Haynes, Univ. of Manchester (United Kingdom)
S. Henrot-Versillé, Lab. de l'Accélérateur Linéaire (France)
N. Holtzer, Spectrométrie Nucléaire et de Spectrométrie de Masse (France)
J. Kaplan, Univ. Paris Diderot-Paris 7 (France)
A. Korotkov, Brown Univ. (United States)
J. Lande, Ctr. de Spectrométrie Nucléaire et de Spectrométrie de Masse (France)
A. Lowitz, Univ. of Wisconsin-Madison (United States)
S. Marnieros, Ctr. de Spectrométrie Nucléaire et de Spectrométrie de Masse (France)
J. Martino, Institut d’Astrophysique Spatiale (France)
S. Masi, Sapienza Univ. di Roma (Italy)
Mark McCulloch, The Univ. of Manchester (United Kingdom)
Simon Melhuish, The Univ. of Manchester (United Kingdom)
L. Montier, Institut de Recherche en Astrophysique et Planétologie (France)
D. Néel, Ctr. de Spectrométrie Nucléaire et de Spectrométrie de Masse (France)
M. W. Ng, Univ. of Manchester (United Kingdom)
F. Pajot, Institut de Recherche en Astrophysique et Planétologie (France)
A. Passerini, Univ. degli Studi di Milano-Bicocca (Italy)
C. Perbost, Univ. Paris Diderot-Paris 7 (France)
O. Perdereau, Lab. de l'Accélérateur Linéaire (France)
F. Piacentini, Sapienza Univ. di Roma (Italy)
M. Piat, Univ. Paris Diderot-Paris 7 (France)
L. Piccirillo, Univ. of Manchester (United Kingdom)
G. Pisano, Cardiff Univ. (United Kingdom)
D. Prêle, Univ. Paris Diderot-Paris 7 (France)
R. Puddu, Sapienza Univ. di Roma (Italy)
D. Rambaud, Institut de Recherche en Astrophysique et Planétologie (France)
O. Rigaut, Ctr. de Spectrométrie Nucléaire et de Spectrométrie de Masse (France)
M. Salatino, Sapienza Univ. di Roma (Italy)
A. Schillaci, Sapienza Univ. di Roma (Italy)
M. Stolpovskiy, Univ. Paris Diderot-Paris 7 (France)
P. Timbie, Univ. of Wisconsin-Madison (United States)
M. Tristram, Lab. de l'Accélérateur Linéaire (France)
G. Tucker, Brown Univ. (United States)
D. Viganò, Univ. degli Studi di Milano (Italy)
F. Voisin, Univ. Paris Diderot-Paris 7 (France)
B. Watson, Univ. of Manchester (United Kingdom)


Published in SPIE Proceedings Vol. 9914:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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