Baryon acoustic oscillations from Integrated Neutral Gas Observations: Broadband corrugated horn construction and testing

Abstract

The Baryon acoustic oscillations from Integrated Neutral Gas Observations (BINGO) telescope is a 40-m~class radio telescope under construction that has been designed to measure the large-angular-scale intensity of HI emission at 980--1260 MHz and hence to constrain dark energy parameters. A large focal plane array comprising of 1.7-metre diameter, 4.3-metre length corrugated feed horns is required in order to optimally illuminate the telescope. Additionally, very clean beams with low sidelobes across a broad frequency range are required, in order to facilitate the separation of the faint HI emission from bright Galactic foreground emission. Using novel construction methods, a full-sized prototype horn has been assembled. It has an average insertion loss of around 0.15 dB across the band, with a return loss around -25 dB. The main beam is Gaussian with the first sidelobe at around $-25 dB. A septum polariser to separate the signal into the two hands of circular polarization has also been designed, built and tested.

arXiv commentThis is a pre-print of an article published in Experimental Astronomy. The final authenticated version is available online at: https://doi.org/10.1007/s10686-020-09666-9

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Cited by in corpus (10)

• Teleparallel Gravity: From Theory to Cosmology
• Prospects for Constraining Interacting Dark Energy Models with 21 cm Intensity Mapping Experiments
• The BINGO Project I: Baryon Acoustic Oscillations from Integrated Neutral Gas Observations
• The BINGO Project II: Instrument Description
• Prospects for measuring dark energy with 21 cm intensity mapping experiments
• HI intensity mapping with MeerKAT: forecast for delay power spectrum measurement using interferometer mode
• Testing the consistency of early and late cosmological parameters with BAO and CMB data
• Testing synchrotron models and frequency resolution in BINGO 21 cm simulated maps using GNILC
• Baryon Acoustic Oscillations from Integrated Neutral Gas Observations: an instrument to observe the 21cm hydrogen line in the redshift range 0.13 $<$ z $<$ 0.45 -- status update
• QUBIC VII: The feedhorn-switch system of the technological demonstrator