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25 April 2024

» arxiv » 1811.8287

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On-sky performance of the CLASS Q-band telescope
John W. Appel ; Zhilei Xu ; Ivan L. Padilla ; Kathleen Harrington ; Bastián Pradenas Marquez ; Aamir Ali ; Charles L. Bennett ; Micheal K. Brewer ; Ricardo Bustos ; Manwei Chan ; David T. Chuss ; Joseph Cleary ; Jullianna Cuoto ; Sumit Dahal ; Kevin Denis ; Rolando Dünner ; Joseph R. Eimer ; Thomas Essinger-Hileman ; Pedro Fluxa ; Dominik Gothe ; Gene C. Hilton ; Johannes Hubmayr ; Jeffrey Iuliano ; John Karakla ; Tobias A. Marriage ; Nathan J. Miller ; Carolina Núñez ; Lucas Parker ; Matthew Petroff ; Carl D. Reintsema ; Karwan Rostem ; Robert W. Stevens ; Deniz Augusto Nunes Valle ; Bingjie Wang ; Duncan J. Watts ; Edward J. Wollack ; Lingzhen Zeng ;
Date:	19 Nov 2018
Abstract:	The Cosmology Large Angular Scale Surveyor (CLASS) is mapping the polarization of the Cosmic Microwave Background (CMB) at large angular scales ($2<elllesssim200$) in search of a primordial gravitational wave B-mode signal down to a tensor-to-scalar ratio of $r approx 0.01$. The same dataset will provide a near sample-variance-limited measurement of the optical depth to reionization. Between June 2016 and March 2018, CLASS completed the largest ground-based Q-band CMB survey to date, covering over 31 000~square-degrees (75% of the sky), with an instantaneous array noise-equivalent temperature (NET) sensitivity of $32~mu mbox{K}_{cmb}sqrt{mbox{s}}$. We demonstrate that the detector optical loading ($1.6~mbox{pW}$) and noise-equivalent power ($19~mbox{aW}sqrt{mbox{s}}$) match the expected noise model dominated by photon bunching noise. We derive a $13.1pm0.3~mbox{K/pW}$ calibration to antenna temperature based on Moon observations, which translates to an optical efficiency of $0.48pm0.04$ and a $27~mbox{K}$ system noise temperature. Finally, we report a Tau A flux density of $315pm19~mbox{Jy}$ at $38.8pm1.0~mbox{GHz}$, consistent with the WMAP Tau A time-dependent spectral flux density model.
Source:	arXiv, 1811.8287
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