Year: 2022
Type: preprint
Abstract: The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) aims to improve constraints on the dark energy equation of state through measurements of large-scale structure at high redshift ($0.8$700MHz. Noise temperature measurements of the HIRAX feeds were performed in a custom apparatus built at Yale. In this system, identical loads, one cryogenic and the other at room temperature, are used to take a differential (Y-factor) measurement from which the noise of the system is inferred. Several measurement sets have been conducted using the system, involving CHIME feeds as well as four of the HIRAX active feeds. These measurements give the first noise temperature measurements of the HIRAX feed, revealing a $\sim$60K noise temperature (relative to 30K target) with 40K peak- to-peak frequency-dependent features, and provide the first demonstration of feed repeatability. Both findings inform current and future feed designs.
Source: arXiv (Cornell University)
Authors: Kuhn, Emily R., Saliwanchik, Benjamin R. B., Bandura, Kevin, Bianco, Michele, Chiang, H. Cynthia, Crichton, Devin, Deng, Meiling, Gaddam, Sindhu, Gerodias, Kit, Gumba, Austin, Harris, Maile, Moodley, Kavilan, Mugundhan, V., Newburgh, Laura, Peterson, Jeffrey, Pieters, Elizabeth, Polish, Anna R., Refregier, Alexandre, Sampath, Ajith, Santos, Mario G., Sengate, Onkabetse, Sievers, Jonathan, Smith, Ema, Tyndall, Will, Walters, Anthony, Weltman, Amanda, Wulf, Dallas
Institutions: Yale University, Brookhaven National Laboratory, West Virginia University, École Polytechnique Fédérale de Lausanne, McGill University, ETH Zurich, Institute of Particle Physics, Institute for Particle Physics and Astrophysics, Perimeter Institute, Dominion Astrophysical Observatory, University of KwaZulu-Natal, Carnegie Mellon University, University of the Western Cape, University of Cape Town
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4288096813