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Author |
Hamilton J-Ch, Charlassier R, Cressiot C, Kaplan J, Piat M, Rosset C, |
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Title |
Sensitivity of a bolometric interferometer to the cosmic microwave backgroud power spectrum
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Journal Article |
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Year |
2008 |
Publication |
A&A |
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Volume |
491 |
Issue |
3 |
Pages |
923-927 |
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Abstract |
Context. The search for B-mode polarization fluctuations in the Cosmic Microwave Background is one of the main challenges of modern cosmology. The expected level of the B-mode signal is very low and therefore requires the development of highly sensitive instruments with low systematic errors. An appealing possibility is bolometric interferometry. Aims. We compare in this article the sensitivity on the CMB angular power spectrum achieved with direct imaging, heterodyne and bolometric interferometry. Methods. Using a simple power spectrum estimator, we calculate its variance leading to the counterpart for bolometric interferometry of the well known Knox formula for direct imaging. Results. We find that bolometric interferometry is less sensitive than direct imaging. However, as expected, it is finally more sensitive than heterodyne interferometry due to the low noise of the bolometers. It therefore appears as an alternative to direct imagers with different and possibly lower systematic errors, mainly due to the absence of an optical setup in front of the horns. |
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915 |
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Bachelor's thesis |
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0004-6361 |
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yes |
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120 |
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Author |
Ghribi Adnan, Tartari Andrea, Galli Silvia, Piat Michel, Breelle Eric, Hamilton Jean-Christophe, Spinelli Sebastiano, Gervasi Massimo, Zannoni Mario, |
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Title |
A demonstrator for bolometric interferometry
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Type |
Journal Article |
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Year |
2009 |
Publication |
JOURNAL OF INFRARED AND MILLIMETER WAVES |
Abbreviated Journal |
1001-9014 |
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Astrophysics – Cosmology and Extragalactic Astrophysics, Astrophysics – Instrumentation and Methods for Astrophysics, |
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Abstract |
Bolometric Interferometry (BI) is one of the most promising techniques for precise measurements of the Cosmic Microwave Background polarization. In this paper, we present the results of DIBO (Demonstrateur d'Interferometrie Bolometrique), a single-baseline demonstrator operating at 90 GHz, built to proof the validity of the BI concept applied to a millimeter-wave interferometer. This instrument has been characterized in the laboratory with a detector at room temperature and with a 4 K bolometer. This allowed us to measure interference patterns in a clean way, both (1) rotating the source and (2) varying with time the phase shift among the two interferometer's arms. Detailed modelisation has also been performed and validated with measurements. |
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915 |
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1001-9014 |
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yes |
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207 |
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Title |
QUBIC: the Q&U Bolometric Interferometer for Cosmology |
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Journal Article |
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Year |
2009 |
Publication |
JOURNAL OF LOW TEMPERATURE PHYSICS |
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Volume |
167 |
Issue |
5-6 |
Pages |
872-878 |
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Abstract |
The primordial B-mode polarisation of the Cosmic Microwave Background is the imprints of the gravitational wave background generated by inflation. Observing the B-mode is up to now the most direct way to constrain the physics of the primordial Universe, especially inflation. To detect these B-modes, high sensitivity is required as well as an exquisite control of systematics effects. To comply with these requirements, we propose a new instrument called QUBIC (Q and U Bolometric Interferometer for Cosmology) based on bolometric interferometry. The control of systematics is obtained with a close-packed interferometer while bolometers cooled to very low temperature allow for high sensitivity. We present the architecture of this new instrument, the status of the project and the self-calibration technique which allows accurate measurement of the instrumental systematic effects. |
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915 |
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Bachelor's thesis |
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0022-2291 |
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yes |
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231 |
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Title |
An efficient phase-shifting scheme for bolometric additive interferometry |
Type |
Journal Article |
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Year |
2009 |
Publication |
ASTRONOMY AND ASTROPHYSICS REVIEW |
Abbreviated Journal |
0935-4956 |
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Volume |
497 |
Issue |
3 |
Pages |
963-971 |
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915 |
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0935-4956 |
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yes |
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Serial |
236 |
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Author |
R. Charlassier, E.F. Bunn, J.-Ch. Hamilton, J. Kaplan, S. Malu. |
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Title |
Bandwidth in bolometric interferometry.
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Type |
Journal Article |
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Year |
2010 |
Publication |
ASTRONOMY & ASTROPHYSICS |
Abbreviated Journal |
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Volume |
514 |
Issue |
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Abstract |
Context. Bolometric interferometry is a promising new technology with potential applications to the detection of B-mode polarization fluctuations of the cosmic microwave background (CMB). A bolometric interferometer will have to take advantage of the wide spectral detection band of its bolometers to be competitive with imaging experiments. A crucial concern is that interferometers are assumed to be significantly affected by a spoiling effect known as bandwidth smearing. Aims: We investigate how the bandwidth modifies the work principle of a bolometric interferometer and affects its sensitivity to the CMB angular power spectra. Methods: We obtain analytical expressions for the broadband visibilities measured by broadband heterodyne and bolometric interferometers. We investigate how the visibilities must be reconstructed in a broadband bolometric interferometer and show that this critically depends on hardware properties of the modulation phase shifters. If the phase shifters produce shifts that are constant with respect to frequency, the instrument works like its monochromatic version (the modulation matrix is not modified), while if they vary (linearly or otherwise) with respect to frequency, one has to perform a special reconstruction scheme, which allows the visibilities to be reconstructed in frequency subbands. Using an angular power spectrum estimator that accounts for the bandwidth, we finally calculate the sensitivity of a broadband bolometric interferometer. A numerical simulation is performed that confirms the analytical results. Results: We conclude that (i) broadband bolometric interferometers allow broadband visibilities to be reconstructed regardless of the type of phase shifters used and (ii) for dedicated B-mode bolometric interferometers, the sensitivity loss caused by bandwidth smearing is quite acceptable, even for wideband instruments (a factor of 2 loss for a typical 20% bandwidth experiment). |
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915 |
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Bachelor's thesis |
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0004-6361 |
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yes |
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Serial |
465 |
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Title |
QUBIC: The QU bolometric interferometer for cosmology
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Type |
Journal Article |
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Year |
2011 |
Publication |
Astroparticle Physics |
Abbreviated Journal |
0927-6505 |
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Volume |
34 |
Issue |
9 |
Pages |
705-716 |
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Keywords |
Cosmology, Cosmic Microwave Background, Inflation, Instrumentation, Bolometric interferometry, |
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Abstract |
One of the major challenges of modern cosmology is the detection of B-mode polarization anisotropies in the Cosmic Microwave Background. These originate from tensor fluctuations of the metric produced during the inflationary phase. Their detection would therefore constitute a major step towards understanding the primordial Universe. The expected level of these anisotropies is however so small that it requires a new generation of instruments with high sensitivity and extremely good control of systematic effects. |
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915 |
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0927-6505 |
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yes |
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Call Number |
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Serial |
1421 |
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Title |
Intensity and polarization of the atmospheric emission at millimetric wavelengths at Dome Concordia
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Journal Article |
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2012 |
Publication |
Monthly Notices of the Royal Astronomical Society |
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Volume |
423 |
Issue |
2 |
Pages |
1293 -1299 |
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915 |
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0035-8711 |
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yes |
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4017 |
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Author |
Romain Charlassier |
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Title |
Measuring the polarisation anisotropy of the Cosmic Microwave Background with the QUBIC bolometric interferometer |
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Year |
2010 |
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Detecting the Cosmic Microwave Background B-mode polarisation is one of the major challenges of nowadays cosmology. This measurement indeed appears as the most powerful way to place constraints on inflation, this process of extreme accelerated expansion that would have occurred during the first few moments of the Universe. The QUBIC project, one of the many experiments dedicated to this purpose, is based on a novel instrumental technique we call bolometric interferometry. The work described in this thesis attempts to establish the instrument design. We introduce a mathematical formalism that shows how the observables of interest can be measured. We then obtain an analytical formula giving the instrument sensitivity and derive the requirements that its components must satisfy. We show in particular that the receivers (horns) distribution must be highly redundant in order for the instrument to achieve an optimal sensitivity. We study the bandwidth smearing effect due to bolometers' wide spectral band and estimate the resulting sensitivity loss. We also introduce alternative designs of bolometric interferometers ; one of them (with rotating half-wave plate and no controlled phase-shifters) has become the standard design of the QUBIC instrument.We finally present a promising self-calibration procedure that, we think, may be regarded in the future as one of the main arguments in favor of bolometric interferometry. |
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yes |
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Call Number |
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4219 |
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Author |
Bigot-Sazy M-A, Charlassier R, Hamilton J-Ch, Kaplan J, Zahariade G, |
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Title |
Self-calibration: an efficient method to control systematic effects in bolometric interferometry
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Type |
Journal Article |
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Year |
2013 |
Publication |
ASTRONOMY & ASTROPHYSICS |
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Volume |
550 |
Issue |
A |
Pages |
59 |
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Context. The QUBIC collaboration is building a bolometric interferometer dedicated to the detection of B-mode polarization fluctuations in the cosmic microwave background.
Aims: We introduce a self-calibration procedure related to those used in radio-interferometry to control a wide range of instrumental systematic errors in polarization-sensitive instruments.
Methods: This procedure takes advantage of the need for measurements on redundant baselines to match each other exactly in the absence of systematic effects. For a given systematic error model, measuring each baseline independently therefore allows writing a system of nonlinear equations whose unknowns are the systematic error model parameters (gains and couplings of Jones matrices, for instance).
Results: We give the mathematical basis of the self-calibration. We implement this method numerically in the context of bolometric interferometry. We show that, for large enough arrays of horns, the nonlinear system can be solved numerically using a standard nonlinear least-squares fitting and that the accuracy achievable on systematic effects is only limited by the time spent on the calibration mode for each baseline apart from the validity of the systematic error model. |
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915 |
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Bachelor's thesis |
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0004-6361 |
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4474 |
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Author |
J.-Ch. Hamilton for the QUBIC Collaboration |
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Title |
QUBIC: The QU Bolometric Interferometer for Cosmology |
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Conference - International - Communication |
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Year |
2013 |
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Invited talk at ESLAB 2013 – THE UNIVERSE AS SEEN BY PLANCK, held at ESTEC, Noordwijk, The Netherlands, 2-5 April 2013 |
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4475 |
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