Design and implementation of a noise temperature measurement system for the Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX)
Emily R. Kuhn, Benjamin R. B. Saliwanchik, Maile Harris, Moumita Aich, Kevin Bandura, Tzu-Ching Chang, H. Cynthia Chiang, Devin Crichton, Aaron Ewall-Wice, Aust… 展开作者
Emily R. Kuhn, Benjamin R. B. Saliwanchik, Maile Harris, Moumita Aich, Kevin Bandura, Tzu-Ching Chang, H. Cynthia Chiang, Devin Crichton, Aaron Ewall-Wice, Austin A. Gumba, N. Gupta, Kabelo Calvin Kesebonye, Jean-Paul Kneib, Martin Kunz, Kavilan Moodley, Laura B. Newburgh, Viraj Nistane, Warren Naidoo, Deniz Ölçek, Jeffrey B. Peterson, Alexandre Refregier, Jonathan L. Sievers, Corrie Ungerer, Alireza Vafaei Sadr, Jacques van Dyk, Amanda Weltman, Dallas Wulf
备注：
19 pages, 12 figures
发表信息：
Proc. SPIE 11445, Ground-based and Airborne Telescopes VIII, 114452Z (20 January 2021)
This paper describes the design, implementation, and verification of a test-bed for determining the noise temperature of radio antennas operating between 400-800MHz. The requirements for this test-bed were driven by the HIRAX experiment, which uses antennas with embedded amplification, making system noise characterization difficult in the laboratory. The test-bed consists of two large cylindrical cavities, each containing radio-frequency (RF) absorber held at different temperatures (300K and 77K), allowing a measurement of system noise temperature through the well-known 'Y-factor' method. The apparatus has been constructed at Yale, and over the course of the past year has undergone detailed verification measurements. To date, three preliminary noise temperature measurement sets have been conducted using the system, putting us on track to make the first noise temperature measurements of the HIRAX feed and perform the first analysis of feed repeatability.
Needlets and foreground removal for SKAO hydrogen intensity maps
INAF-IASF Milano（意大利国家天体物理研究所米兰天文物理研究所）；INAF - Osservatorio Astronomico di Trieste（意大利国家天体物理研究所的里雅斯特天文台）；IFPU - Institute for Fundamental Physics of the Universe（宇宙基础物理研究所）；Dipartimento di Fisica, Università degli Studi di Torino（意大利国家核物理研究所都灵分部）；INFN-Sezione di Torino（坎塔布里亚物理研究所）；Instituto de Fisica de Cantabria (CSIC-UC)
Flux Density Calibration of Radio Bursts Detected in the Sidelobes of the Canadian Hydrogen Intensity Mapping Experiment
York University（约克大学）；ASTRON, Netherlands Institute for Radio Astronomy（荷兰射电天文研究所）；UvA（阿姆斯特丹大学）；MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology（麻省理工学院卡弗里天体物理与空间研究研究所）；Department of Physics, Massachusetts Institute of Technology（麻省理工学院物理学系）；Laboratoire d’Astrophysique de Marseille, Aix-Marseille Univ.（马赛天体物理实验室，艾克斯-马赛大学）
Project management of the Canadian Hydrogen Observatory and Radio-transient Detector
McGill University（麦吉尔大学）；National Research Council Canada（加拿大国家研究委员会）；Perimeter Institute for Theoretical Physics（珀米特理论物理研究所）；University of Toronto（多伦多大学）
