天空平均21厘米宇宙学实验的无线电天线设计:REACH案例

IF 1.5 Q3 ASTRONOMY & ASTROPHYSICS

Journal of Astronomical Instrumentation Pub Date : 2021-09-21 DOI:10.1142/s2251171722500015

J. Cumner, E. Acedo, D. Villiers, D. Anstey, C. Kolitsidas, B. Gurdon, N. Fagnoni, P. Alexander, G. Bernardi, H. Bevins, S. Carey, J. Cavillot, Riccardo Chiello, C. Craeye, W. Croukamp, J. Ely, A. Fialkov, T. Gessey-Jones, Q. Gueuning, Will Handley, R. Hills, A. Josaitis, G. Kulkarni, A. Magro, R. Maiolino, P. Meerburg, S. Mittal, J. Pritchard, E. Puchwein, N. Razavi-Ghods, I. Roque, A. Saxena, K. Scheutwinkel, E. Shen, P. Sims, O. Smirnov, M. Spinelli, K. Zarb-Adami

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引用次数: 6

摘要

据报道，在2018年EDGES实验检测到与宇宙黎明号发出的21厘米天空平均信号相关的吸收现象之后，已经建立了许多实验来验证这一结果。本文讨论了用于全球21厘米实验的设计过程，特别关注宇宙氢分析无线电实验(REACH)。本实验将通过对仪器的详细建模和表征来理解和补偿系统误差。详细的定量指标和数值建模用于辅助REACH偶极子天线(REACH阶段的两个天线设计之一)的设计过程。该设计过程产生2.5:1频率带宽的偶极子。该设计的目的是平衡频谱平滑性和低阻抗反射，同时能够描述和理解天线对天空信号的响应，从而为观测和数据分析期间至关重要的校准提供信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Radio antenna design for sky-averaged 21 cm cosmology experiments: the REACH case

Following the reported detection of an absorption pro¯le 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 speci¯cally 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 modeling and characteri-zation of the instrumentation. Detailed quantitative ¯gures of merit and numerical modeling are used to assist the design process of the REACH dipole antenna (one of the two antenna designs for REACH Phase I). This design process produced a 2.5:1 frequency bandwidth dipole. The aim of this design was to balance spectral smoothness and low impedance re°ections with the ability to describe and understand the antenna response to the sky signal to inform the critically important calibration during observation and data analysis.

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来源期刊

Journal of Astronomical Instrumentation ASTRONOMY & ASTROPHYSICS-

CiteScore

2.30

自引率

7.70%

发文量

期刊介绍： The Journal of Astronomical Instrumentation (JAI) publishes papers describing instruments and components being proposed, developed, under construction and in use. JAI also publishes papers that describe facility operations, lessons learned in design, construction, and operation, algorithms and their implementations, and techniques, including calibration, that are fundamental elements of instrumentation. The journal focuses on astronomical instrumentation topics in all wavebands (Radio to Gamma-Ray) and includes the disciplines of Heliophysics, Space Weather, Lunar and Planetary Science, Exoplanet Exploration, and Astroparticle Observation (cosmic rays, cosmic neutrinos, etc.). Concepts, designs, components, algorithms, integrated systems, operations, data archiving techniques and lessons learned applicable but not limited to the following platforms are pertinent to this journal. Example topics are listed below each platform, and it is recognized that many of these topics are relevant to multiple platforms. Relevant platforms include: Ground-based observatories[...] Stratospheric aircraft[...] Balloons and suborbital rockets[...] Space-based observatories and systems[...] Landers and rovers, and other planetary-based instrument concepts[...]