BRAIN/MBI is a mm-wave ground-based experiment dedicated to the study of the B-modes of CMB polarization. It is based on the bolometric interferometry (BI) technique, and it is the result of the merging of two different projects proposed in the last years: BRAIN (France, Italy, UK) and MBI 4 (US, UK). BI is a technique already validated in a laboratory environment using small scale demonstrators employing as detectors standard 4 K bolometers. In fact, both the MBI and BRAIN teams demonstrated that interference fringes are observed once the signals coming from the two antennas of a single baseline are phase-shifted, combined and then detected. Both optical and wave-guided combination schemes have been tested within the collaboration. From the hardware point of view, the simplest unity of BRAIN/MBI is constituted by a feed horn, an OMT, and two independent phase shifters for each polarization. After phase shifting, the two beams coming out from each unity, feed a beam combiner redirecting the signals towards the detectors. Some of the most critical components, that are OMTs, phase-shifters and possibly detectors, will be made using superconducting technologies and are now under development. Moreover, detailed calculations showed that the sensitivity of a bolometric interferometer, if operated with a proper phase modulation-demodulation scheme, can approach that one of an imager with a comparable number of detectors, while exploiting the systematics cleaness of compact interferometers. On one side, BRAIN/MBI will be an instrument with a sensitivity and a polarization purity suitable for the detection of B-modes. On the other side, it will be a benchmark for new and promisings technologies that may be qualified for the CMB science in perspective of a post-Planck space mission. Since BI is prone to different contaminations from systematics with respect to imagers, a cross-check of the results and a comparison of two conceptually orthogonal strategies will finally be possible

Tartari, A., Bartlett, J., Battistelli, E., Bau', A., Bennett, D., Bergè, L., et al. (2009). BRAIN/MBI: a bolometric interferometer dedicated to the CMB polarization. In Millimetre and sub-millimetre waves - From technologies to systems (pp.641-648).

BRAIN/MBI: a bolometric interferometer dedicated to the CMB polarization

BAU', ALESSANDRO;GERVASI, MASSIMO;PASSERINI, ANDREA;SIRONI, GIORGIO;ZANNONI, MARIO
2009

Abstract

BRAIN/MBI is a mm-wave ground-based experiment dedicated to the study of the B-modes of CMB polarization. It is based on the bolometric interferometry (BI) technique, and it is the result of the merging of two different projects proposed in the last years: BRAIN (France, Italy, UK) and MBI 4 (US, UK). BI is a technique already validated in a laboratory environment using small scale demonstrators employing as detectors standard 4 K bolometers. In fact, both the MBI and BRAIN teams demonstrated that interference fringes are observed once the signals coming from the two antennas of a single baseline are phase-shifted, combined and then detected. Both optical and wave-guided combination schemes have been tested within the collaboration. From the hardware point of view, the simplest unity of BRAIN/MBI is constituted by a feed horn, an OMT, and two independent phase shifters for each polarization. After phase shifting, the two beams coming out from each unity, feed a beam combiner redirecting the signals towards the detectors. Some of the most critical components, that are OMTs, phase-shifters and possibly detectors, will be made using superconducting technologies and are now under development. Moreover, detailed calculations showed that the sensitivity of a bolometric interferometer, if operated with a proper phase modulation-demodulation scheme, can approach that one of an imager with a comparable number of detectors, while exploiting the systematics cleaness of compact interferometers. On one side, BRAIN/MBI will be an instrument with a sensitivity and a polarization purity suitable for the detection of B-modes. On the other side, it will be a benchmark for new and promisings technologies that may be qualified for the CMB science in perspective of a post-Planck space mission. Since BI is prone to different contaminations from systematics with respect to imagers, a cross-check of the results and a comparison of two conceptually orthogonal strategies will finally be possible
slide + paper
CMB, Polarization
English
5th ESA Workshop on Millimetre Wave Technology and Applications & 31st ESA Antenna Workshop
Tartari, A., Bartlett, J., Battistelli, E., Bau', A., Bennett, D., Bergè, L., et al. (2009). BRAIN/MBI: a bolometric interferometer dedicated to the CMB polarization. In Millimetre and sub-millimetre waves - From technologies to systems (pp.641-648).
Tartari, A; Bartlett, J; Battistelli, E; Bau', A; Bennett, D; Bergè, L; Bernard, J; Bounab, A; Brèelle, E; Bunn, E; Charlassier, R; Cruciani, A; Collin, S; Curran, G; De Bernardis, P; Dumoulin, L; Gault, A; Gervasi, M; Ghribi, A; Giard, M; Giordano, C; Giraud Hèraud, J; Gradziel, M; Guglielmi, L; Hamilton, J; Haynes, V; Iacoangeli, A; Kaplan, J; Korotkov, A; Lande, J; Maffei, B; Maiello, M; Malu, S; Marnieros, S; Masi, S; Murphy, A; O'Sullivan, C; Pajot, F; Passerini, A; Peterzen, S; Piacentini, F; Piccirillo, L; Piat, M; Pisano, G; Polenta, G; Prêle, D; Rosset, C; Schillaci, A; Sironi, G; Spinelli, S; Tucker, G; Timbie, P; Voisin, F; Watson, B; Zannoni, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/7726
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