{"paper":{"title":"Radio antenna design for sky-averaged 21 cm cosmology experiments: the REACH case","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"A. Fialkov, A. Magro, A. Saxena, A. T. Josaitis, B. Gurdon, C. Craeye, C. I. Kolitsidas, D. Anstey, D. I. L. de Villiers, E. de Lera Acedo, E. Puchwein, E. Shen, G. Bernardi, G. Kulkarni, H. T. J. Bevins, I. L. V. Roque, J. A. Ely, J. Cavillot, J. Cumner, J. R. Pritchard, K. H. Scheutwinkel, K. Zarb-Adami, M. Spinelli, N. Fagnoni, N. Razavi-Ghods, O. Smirnov, P. Alexander, P. D. Meerburg, P. H. Sims, Q. Gueuning, R. Chiello, R. Hills, R. Maiolino, S. Carey, S. Mittal, T. Gessey-Jones, W. Croukamp, W. Handley","submitted_at":"2021-09-21T11:06:44Z","abstract_excerpt":"Following the reported detection of an absorption profile associated with the 21~cm sky-averaged signal from the Cosmic Dawn by the EDGES experiment in 2018, a number of experiments have been set up to verify this result. This paper discusses the design process used for global 21~cm experiments, focusing specifically on the Radio Experiment for the Analysis of Cosmic Hydrogen (REACH). This experiment will seek to understand and compensate for systematic errors present using detailed modelling and characterization of the instrumentation. There is detailed the quantitative figures of merit and n"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.10098","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2109.10098/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}