Accès ouvert déclaré
2024
preprint
Calibration Measurements of the BICEP3 and BICEP Array CMB Polarimeters from 2017 to 2024
Christos Giannakopoulos, C. Vergès, P. A. R. Ade, A. Zeeshan, M. Amiri, Denis Barkats, R. Basu Thakur, Colin A. Bischoff, D. Beck, J. J. Bock, Hans Boenish, Victor Buza, James R. Cheshire, Jake Connors, James Cornelison, M. Crumrine, A. Cukierman, Edward Denison, M. Dierickx, L. Duband, Miranda Eiben, Brodi Elwood, S. Fatigoni, Jeff P. Filippini, Antonio Fortes, Min Gao, N. Goeckner-Wald, D. C. Goldfinger, James A. Grayson, Paul Grimes, Grantland Hall, George Halal, Mark Halpern, E. Hand, Sam A. Harrison, Shawn Henderson, Johannes Hubmayr, H. Hui, K. D. Irwin, J. Kang, Kirit S. Karkare, Sinan Kefeli, J. M. Kovac, Chao‐Lin Kuo, K. Lau, Margaret Lautzenhiser, Amber R. Lennox, Tongtian Liu, Koko G. Megerian, Oliver Miller, Lorenzo Minutolo, Lorenzo Moncelsi, Yuka Nakato, H. T. Nguyen, Roger O'brient, Anika Patel, Matthew A. Petroff, Anna Rose Polish, Nathan Precup, Thomas Prouve, Clement Pryke, Carl D. Reintsema, Thibault Romand, Maria Salatino, A. Schillaci, Benjamin L. Schmitt, Baibhav Singari, Ahmed Soliman, T. St. Germaine, A. Steiger, Bryan Steinbach, Rashmi Sudiwala, K. Thompson, Calvin Tsai, C. Tucker, Anthony D. Turner, A. G. Vieregg, Albert Wandui, Alexis C. Weber, Justin Willmert, Wai Ling K. Wu, Hung-I Yang, Cyndia Yu, Lingzhen Zeng, Cheng Zhang, Silvia Zhang
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Le résumé fourni par la source
The BICEP3 and BICEP Array polarimeters are small-aperture refracting telescopes located at the South Pole designed to measure primordial gravitational wave signatures in the Cosmic Microwave Background (CMB) polarization, predicted by inflation. Constraining the inflationary signal requires not only excellent sensitivity, but also careful control of instrumental systematics. Both instruments use antenna-coupled orthogonally polarized detector pairs, and the polarized sky signal is reconstructed by taking the difference in each detector pair. As a result, the differential response between detectors within a pair becomes an important systematic effect we must control. Additionally, mapping the intensity and polarization response in regions away from the main beam can inform how sidelobe levels affect CMB measurements. Extensive calibration measurements are taken in situ every austral summer for control of instrumental systematics and instrument characterisation. In this work, we detail the set of beam calibration measurements that we conduct on the BICEP receivers, from deep measurements of main beam response to polarized beam response and sidelobe mapping. We discuss the impact of these measurements for instrumental systematics studies and design choices for future CMB receivers.
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