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1. The large scale polarization explorer (LSPE) for CMB measurements: performance forecast

Author

The LSPE collaboration, Addamo, G., Ade, P. A. R., Baccigalupi, C., Baldini, A. M., Battaglia, P. M., Battistelli, E. S., Baù, A., de Bernardis, P., Bersanelli, M., Biasotti, M., Boscaleri, A., Caccianiga, B., Caprioli, S., Cavaliere, F., Cei, F., Cleary, K. A., Columbro, F., Coppi, G., Coppolecchia, A., Cuttaia, F., D'Alessandro, G., De Gasperis, G., De Petris, M., Fafone, V., Farsian, F., Barusso, L. Ferrari, Fontanelli, F., Franceschet, C., Gaier, T. C., Galli, L., Gatti, F., Genova-Santos, R., Gerbino, M., Gervasi, M., Ghigna, T., Grosso, D., Gruppuso, A., Gualtieri, R., Incardona, F., Jones, M. E., Kangaslahti, P., Krachmalnicoff, N., Lamagna, L., Lattanzi, M., López-Caraballo, C. H., Lumia, M., Mainini, R., Maino, D., Mandelli, S., Maris, M., Masi, S., Matarrese, S., May, A., Mele, L., Mena, P., Mennella, A., Molina, R., Molinari, D., Morgante, G., Natale, U., Nati, F., Natoli, P., Pagano, L., Paiella, A., Panico, F., Paonessa, F., Paradiso, S., Passerini, A., Perez-de-Taoro, M., Peverini, O. A., Piacentini, F., Piccirillo, L., Pisano, G., Poletti, D., Presta, G., Realini, S., Reyes, N., Rubino-Martin, J. A., Sandri, M., Sartor, S., Pezzotta, F., Polenta, G., Rocchi, A., Schillaci, A., Signorelli, G., Siri, B., Soria, M., Spinella, F., Tapia, V., Tartari, A., Taylor, A. C., Terenzi, L., Tomasi, M., Tommasi, E., Tucker, C., Vaccaro, D., Vigano, D. M., Villa, F., Virone, G., Vittorio, N., Volpe, A., Watkins, R. E. J., Zacchei, A., Zannoni, M., The LSPE collaboration, Addamo, G., Ade, P. A. R., Baccigalupi, C., Baldini, A. M., Battaglia, P. M., Battistelli, E. S., Baù, A., de Bernardis, P., Bersanelli, M., Biasotti, M., Boscaleri, A., Caccianiga, B., Caprioli, S., Cavaliere, F., Cei, F., Cleary, K. A., Columbro, F., Coppi, G., Coppolecchia, A., Cuttaia, F., D'Alessandro, G., De Gasperis, G., De Petris, M., Fafone, V., Farsian, F., Barusso, L. Ferrari, Fontanelli, F., Franceschet, C., Gaier, T. C., Galli, L., Gatti, F., Genova-Santos, R., Gerbino, M., Gervasi, M., Ghigna, T., Grosso, D., Gruppuso, A., Gualtieri, R., Incardona, F., Jones, M. E., Kangaslahti, P., Krachmalnicoff, N., Lamagna, L., Lattanzi, M., López-Caraballo, C. H., Lumia, M., Mainini, R., Maino, D., Mandelli, S., Maris, M., Masi, S., Matarrese, S., May, A., Mele, L., Mena, P., Mennella, A., Molina, R., Molinari, D., Morgante, G., Natale, U., Nati, F., Natoli, P., Pagano, L., Paiella, A., Panico, F., Paonessa, F., Paradiso, S., Passerini, A., Perez-de-Taoro, M., Peverini, O. A., Piacentini, F., Piccirillo, L., Pisano, G., Poletti, D., Presta, G., Realini, S., Reyes, N., Rubino-Martin, J. A., Sandri, M., Sartor, S., Pezzotta, F., Polenta, G., Rocchi, A., Schillaci, A., Signorelli, G., Siri, B., Soria, M., Spinella, F., Tapia, V., Tartari, A., Taylor, A. C., Terenzi, L., Tomasi, M., Tommasi, E., Tucker, C., Vaccaro, D., Vigano, D. M., Villa, F., Virone, G., Vittorio, N., Volpe, A., Watkins, R. E. J., Zacchei, A., and Zannoni, M.

Abstract

[Abridged] The measurement of the polarization of the Cosmic Microwave Background radiation is one of the current frontiers in cosmology. In particular, the detection of the primordial B-modes, could reveal the presence of gravitational waves in the early Universe. The detection of such component is at the moment the most promising technique to probe the inflationary theory describing the very early evolution of the Universe. We present the updated performance forecast of the Large Scale Polarization Explorer (LSPE), a program dedicated to the measurement of the CMB polarization. LSPE is composed of two instruments: Strip, a radiometer-based telescope on the ground in Tenerife, and SWIPE (Short-Wavelength Instrument for the Polarization Explorer) a bolometer-based instrument designed to fly on a winter arctic stratospheric long-duration balloon. The program is among the few dedicated to observation of the Northern Hemisphere, while most of the international effort is focused into ground-based observation in the Southern Hemisphere. Measurements are currently scheduled in Winter 2021/22 for SWIPE, with a flight duration up to 15 days, and in Summer 2021 with two years observations for Strip. We describe the main features of the two instruments, identifying the most critical aspects of the design, in terms of impact into performance forecast. We estimate the expected sensitivity of each instrument and propagate their combined observing power to the sensitivity to cosmological parameters, including the effect of scanning strategy, component separation, residual foregrounds and partial sky coverage. We also set requirements on the control of the most critical systematic effects and describe techniques to mitigate their impact. LSPE can reach a sensitivity in tensor-to-scalar ratio of $\sigma_r<0.01$, and improve constrains on other cosmological parameters., Comment: Submitted to JCAP. Abstract abridged for arXiv submission

Published
2020
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2. Design and Verification of a Q-Band Test Source for UAV-Based Radiation Pattern Measurements

Author

Paonessa, F, Virone, G, Ciorba, L, Addamo, G, Lumia, M, Dassano, G, Zannoni, M, Franceschet, C, Peverini, O, Paonessa, Fabio, Virone, Giuseppe, Ciorba, Lorenzo, Addamo, Giuseppe, Lumia, Mauro, Dassano, Gianluca, Zannoni, Mario, Franceschet, Cristian, Peverini, Oscar A., Paonessa, F, Virone, G, Ciorba, L, Addamo, G, Lumia, M, Dassano, G, Zannoni, M, Franceschet, C, Peverini, O, Paonessa, Fabio, Virone, Giuseppe, Ciorba, Lorenzo, Addamo, Giuseppe, Lumia, Mauro, Dassano, Gianluca, Zannoni, Mario, Franceschet, Cristian, and Peverini, Oscar A.

Abstract

In the last years, the unmanned aerial vehicles (UAVs) generated significant innovations in in situ antenna measurements. UAV-mounted test sources have been exploited to characterize the radiation pattern of receiving antennas and arrays for HF radars, radio telescopes in very high-frequency (VHF) band, and up to the X-band for radar characterization. A UAV test source operating in the Q -band has been recently developed within the large-scale polarization explorer (LSPE) project. It will be used for the in situ validation of a ground-based cluster of coherent polarimeters for cosmology observation. This article presents the payload solution that is actually applicable to general UAV-based radiation pattern measurements in the Q-band. It is based on a phase-locked loop synthesizer and an active multiplier coupled with a power detector to compensate for signal power drifts in postprocessing. Relevant system tests have been performed in both laboratory environment and operative conditions. The measured outdoor radiation patterns are in good agreement with both the anechoic chamber measurements and simulated data.

Published
2020

3. Modeling, Design and Experimental Characterization of the Q-band OMTs and Polarizers for the STRIP-LSPE Balloon Experiment

Author

Peverini, O, Virone, G, Addamo, G, Lumia, M, Farooqui, Z, Tascone, R, Mennella, A, Bersanelli, M, Morgante, G, Zannoni, M, Gervasi, M, Gregorio, A, Zacchei, A, Peverini, O. A., Virone, G., Addamo, G., Lumia, M., Farooqui, Z., Tascone, R., Mennella, A., Bersanelli, M., Morgante, G., Gregorio, A., Zacchei, A., ZANNONI, MARIO, GERVASI, MASSIMO, Peverini, O, Virone, G, Addamo, G, Lumia, M, Farooqui, Z, Tascone, R, Mennella, A, Bersanelli, M, Morgante, G, Zannoni, M, Gervasi, M, Gregorio, A, Zacchei, A, Peverini, O. A., Virone, G., Addamo, G., Lumia, M., Farooqui, Z., Tascone, R., Mennella, A., Bersanelli, M., Morgante, G., Gregorio, A., Zacchei, A., ZANNONI, MARIO, and GERVASI, MASSIMO

Abstract

This paper reports on the Q-band polarizers and ortho-mode transducers developed for the STRatospheric Italian Polarimeter (STRIP) coherent multi-feed instrument. A split-block design of groove polarizers and an ad-hoc assembly procedure have been conceived in order to achieve recurring high-performance for all the 49 polarizers (i.e., cross-polarization < -35 dB, return-loss > 36 dB, insertion-loss < 0.07 dB). The ortho-mode transducers are based on a novel multi-layer turnstile-junction design. This configuration has been conceived toward a high parallelization rate of the manufacturing process, while providing high electromagnetic performance (cross-coupling < -50 dB, isolation > 50 dB).

Published
2015

4. Modeling, Design and Experimental Characterization of the Q-band OMTs and Polarizers for the STRIP-LSPE Balloon Experiment

Author

Peverini, O, Virone, G, Addamo, G, Lumia, M, Farooqui, Z, Tascone, R, Mennella, A, Bersanelli, M, Morgante, G, Zannoni, M, Gervasi, M, Gregorio, A, Zacchei, A, Peverini, O. A., Virone, G., Addamo, G., Lumia, M., Farooqui, Z., Tascone, R., Mennella, A., Bersanelli, M., Morgante, G., Gregorio, A., Zacchei, A., ZANNONI, MARIO, GERVASI, MASSIMO, Peverini, O, Virone, G, Addamo, G, Lumia, M, Farooqui, Z, Tascone, R, Mennella, A, Bersanelli, M, Morgante, G, Zannoni, M, Gervasi, M, Gregorio, A, Zacchei, A, Peverini, O. A., Virone, G., Addamo, G., Lumia, M., Farooqui, Z., Tascone, R., Mennella, A., Bersanelli, M., Morgante, G., Gregorio, A., Zacchei, A., ZANNONI, MARIO, and GERVASI, MASSIMO

Abstract

This paper reports on the Q-band polarizers and ortho-mode transducers developed for the STRatospheric Italian Polarimeter (STRIP) coherent multi-feed instrument. A split-block design of groove polarizers and an ad-hoc assembly procedure have been conceived in order to achieve recurring high-performance for all the 49 polarizers (i.e., cross-polarization < -35 dB, return-loss > 36 dB, insertion-loss < 0.07 dB). The ortho-mode transducers are based on a novel multi-layer turnstile-junction design. This configuration has been conceived toward a high parallelization rate of the manufacturing process, while providing high electromagnetic performance (cross-coupling < -50 dB, isolation > 50 dB).

Published
2015

5. Q-band antenna-feed system for the Large Scale Polarization Explorer balloon experiment

Author

Peverini, O, Virone, G, Del Torto, F, Franceschet, C, Villa, F, Lumia, M, Farooqui, Z, Mennella, A, Bersanelli, M, Zannoni, M, Gervasi, M, Addamo, G, Battaglia, P, Cavaliere, F, Morgante, G, Gregorio, A, Zacchei, A, Tascone, R, Tascone, R., ZANNONI, MARIO, GERVASI, MASSIMO, Peverini, O, Virone, G, Del Torto, F, Franceschet, C, Villa, F, Lumia, M, Farooqui, Z, Mennella, A, Bersanelli, M, Zannoni, M, Gervasi, M, Addamo, G, Battaglia, P, Cavaliere, F, Morgante, G, Gregorio, A, Zacchei, A, Tascone, R, Tascone, R., ZANNONI, MARIO, and GERVASI, MASSIMO

Abstract

This work will present the corrugated-horns, polarizers and ortho-mode transducers developed for the 49-element coherent polarimeter array working in [39, 48] GHz to be embarked in the Large Scale Polarization Explorer. The latter is an ASI-funded balloon experiment designed to measure the CMB B-modes on large angular scales. The presentation will focus on the analysis, design, manufacturing and measurements of these components.

Published
2015

6. New RF data on ECCOSORB CR/MF absorber

Author

Holland, WS, Zmuidzinas, J, Valenziano, L, Peverini, O, Zannoni, M, Tascone, R, Addamo, G, Virone, G, Lumia, M, Mariotti, S, De Rosa, S, Peverini, OA, De Rosa, S., ZANNONI, MARIO, Holland, WS, Zmuidzinas, J, Valenziano, L, Peverini, O, Zannoni, M, Tascone, R, Addamo, G, Virone, G, Lumia, M, Mariotti, S, De Rosa, S, Peverini, OA, De Rosa, S., and ZANNONI, MARIO

Abstract

ECCOSORBTM CR/MF is a widely used absorber at radio and millimeter wavelengths. It is used both at room and at cryogenic temperature to realize loads and calibrators both for laboratory and for space-borne instruments. Data on its RF properties are available from the data sheet at room temperature. But it is also widely used outside the design wavelength range and at cryogenic temperature, where specific measurement of electromagnetic and thermal properties are needed. Scarce information is available in the literature and inconsistencies are frequent. We report here new RF data in Ka and W-band at room temperature obtained with waveguide measurements with different setups.

Published
2014

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