Cavaliere, F. and Mennella, A. and Zannoni, M. and Battaglia, P. and Battistelli, E.S. and de Bernardis, P. and Burke, D. and D'Alessandro, G. and De Petris, M. and Franceschet, C. and Grandsire, L. and Hamilton, J.-Ch. and Maffei, B. and Manzan, E. and Marnieros, S. and Masi, S. and O'Sullivan, Créidhe and Passerini, A. and Pezzotta, F. and Piat, M. and Tartari, A. and Torchinsky, S.A. and Viganò, D. and Voisin, F. and Ade, P. and Alberro, J.G. and Almela, A. and Amico, G. and Arnaldi, L.H. and Auguste, D. and Aumont, J. and Azzoni, S. and Banfi, S. and Baù, A. and Bélier, B. and Bennett, D. and Bergé, L. and Bernard, J.-Ph. and Bersanelli, M. and Bigot-Sazy, M.-A. and Bonaparte, J. and Bonis, J. and Bunn, E. and Buzi, D. and Chanial, P. and Chapron, C. and Charlassier, R. and Cobos Cerutti, A.C. and Columbro, F. and Coppolecchia, A. and De Gasperis, G. and De Leo, M. and Dheilly, S. and Duca, C. and Dumoulin, L. and Etchegoyen, A. and Fasciszewski, A. and Ferreyro, L.P. and Fracchia, D. and Gamboa Lerena, M.M. and Ganga, K.M. and García, B. and García Redondo, M.E. and Gaspard, M. and Gayer, D. and Gervasi, M. and Giard, M. and Gilles, V. and Giraud-Heraud, Y. and Gómez Berisso, M. and González, M. and Gradziel, M. and Hampel, M.R. and Harari, D. and Henrot-Versillé, S. and Incardona, F. and Jules, E. and Kaplan, J. and Kristukat, C. and Lamagna, L. and Loucatos, S. and Louis, T. and Marty, W. and Mattei, A. and May, A. and McCulloch, M. and Mele, L. and Melo, D. and Montier, L. and Mousset, L. and Mundo, L.M. and Murphy, J.A. and Murphy, J.D. and Nati, F. and Olivieri, E. and Oriol, C. and Paiella, A. and Pajot, F. and Pastoriza, H. and Pelosi, A. and Perbost, C. and Perciballi, M. and Piacentini, F. and Piccirillo, L. and Pisano, G. and Platino, M. and Polenta, G. and Prêle, D. and Puddu, R. and Rambaud, D. and Rasztocky, E. and Ringegni, P. and Romero, G.E. and Salum, J.M. and Schillaci, A. and Scóccola, C.G. and Scully, S. and Spinelli, S. and Stankowiak, G. and Stolpovskiy, M. and Supanitsky, A.D. and Thermeau, J.-P. and Timbie, P. and Tomasi, M. and Tucker, C. and Tucker, G. and Vittorio, N. and Wicek, F. and Wright, M. and Zullo, A. (2022) QUBIC VII: The feedhorn-switch system of the technological demonstrator. Journal of Cosmology and Astroparticle Physics, 04 (40). pp. 1-41. ISSN 1475-7516

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Abstract

We present the design, manufacturing and performance of the horn-switch system developed for the technological demonstrator of QUBIC (the Q&U Bolometric Interferometer for Cosmology). This system consists of 64 back-to-back dual-band (150 GHz and 220 GHz) corrugated feed-horns interposed with mechanical switches used to select desired baselines during the instrument self-calibration. We manufactured the horns in aluminum platelets milled by photo-chemical etching and mechanically tightened with screws. The switches are based on steel blades that open and close the waveguide between the back-to-back horns and are operated by miniaturized electromagnets. The measured electromagnetic performance of the feedhorns agrees with simulations. In particular we obtained a return loss around -20 dB up to 230 GHz and beam patterns in agreement with single-mode simulations down to -30 dB. The switches for this prototype were designed and built for the 150 GHz band. In this frequency range we find return and insertion losses consistent with expectations (<-25 dB and ∼-0.1 dB, respectively) and an isolation larger than 70 dB. In this paper we also show the current development status of the feedhorn-switch system for the QUBIC full instrument, based on an array of 400 horn-switch assemblies.

Item Type:	Article
Keywords:	CMB experiments; CMB polarization; feedhorn arrays; microwave propagation;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	18830
Identification Number:	https://doi.org/10.1088/1475-7516/2022/04/040
Depositing User:	Dr. Créidhe O'Sullivan
Date Deposited:	04 Sep 2024 09:17
Journal or Publication Title:	Journal of Cosmology and Astroparticle Physics
Publisher:	IOP Publishing
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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