Receiver design for the REACH global 21-cm signal experiment.

• Tác giả: P Alexander, D Anstey, G Bernardi, H T J Bevins, Steven H Carey, J Cavillot, Riccardo Chiello, W Croukamp, J Cumner, E de Lera Acedo, D I L de Villiers, John A Ely, A Fialkov, T Gessey-Jones, Q Gueuning, Will Handley, Tian Huang, A T Josaitis, G Kulkarni, S A K Leeney, Alessio Magro, R Maiolino, P D Meerburg, S Mittal, M Pagano, S Pegwal, C Pieterse, J R Pritchard, Nima Razavi-Ghods, Ian L V Roque, A Saxena, K H Scheutwinkel, P Scott, E Shen, P H Sims, O Smirnov, M Spinelli, K Zarb-Adami
• Ngôn ngữ: eng
• Ký hiệu phân loại: 234.9 Predestination and free will
• Thông tin xuất bản: Netherlands : Experimental astronomy , 2025
• Bộ sưu tập: NCBI
• ID: 496849

Tóm tắt

We detail the REACH radiometric system designed to enable measurements of the 21-cm neutral hydrogen line. Included is the radiometer architecture and end-to-end system simulations as well as a discussion of the challenges intrinsic to highly-calibratable system development. Following this, we share laboratory results based on the calculation of noise wave parameters utilising an over-constrained least squares approach. For five hours of integration on a custom-made source with comparable impedance to that of the antenna used in the field, we demonstrate a calibration RMSE of 80 mK. This paper therefore documents the state of the calibrator and data analysis in December 2022 in Cambridge before shipping to South Africa.