http://arxiv.org/abs/1702.05126
This paper is the first on a series of papers describing the impact of antenna instrumental artefacts on the 21-cm cosmology experiments to be carried out by the SKA1-LOW telescope, i.e., the Cosmic Dawn (CD) and the Epoch of Reionization (EoR). The smoothness of the passband response of the current log-periodic antenna being developed for the SKA1-LOW is analyzed using numerical electromagnetic simulations. The frequency ripples are characterized using low-order polynomials defined locally, in order to study the impact of the passband smoothness in the instrument calibration and CD/EoR Science. A solution is offered to correct a fast ripple found at 60 MHz during a test campaign at the SKA site at the Murchison Radio-astronomy Observatory, Western Australia in September 2015 with a minor impact on the telescope’s performance and design. A comparison with the Hydrogen Epoch of Reionization Array antenna is also shown demonstrating the potential use of the SKA1-LOW antenna for the Delay Spectrum technique to detect the EoR.
E. Acedo, C. Trott, R. Wayth, et. al.
Mon, 20 Feb 17
25/37
Comments: 12 pages, 19 figures, submitted to MNRAS
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