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The Tianlai Cylinder Pathfinder Array: System Functions and Basic Performance Analysis

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arxiv 2006.05605 v1 pith:XZPENZYT submitted 2020-06-10 astro-ph.IM astro-ph.COphysics.ins-det

Jixia Li , Shifan Zuo , Fengquan Wu , Yougang Wang , Juyong Zhang , Shijie Sun , Yidong Xu , Zijie Yu
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Reza Ansari Yichao Li Albert Stebbins Peter Timbie Yanping Cong Jingchao Geng Jie Hao Qizhi Huang Jianbin Li Rui Li Donghao Liu Yingfeng Liu Tao Liu John P. Marriner Chenhui Niu Ue-Li Pen Jeffery B. Peterson Huli Shi Lin Shu Yafang Song Haijun Tian Guisong Wang Qunxiong Wang Rongli Wang Weixia Wang Kaifeng Yu Jiao Zhang Boqin Zhu Jialu Zhu Xuelei Chen (Tianlai Collaboration)
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The Tianlai Cylinder Pathfinder is a radio interferometer array designed to test techniques for 21 cm intensity mapping in the post-reionization Universe, with the ultimate aim of mapping the large scale structure and measuring cosmological parameters such as the dark energy equation of state. Each of its three parallel cylinder reflectors is oriented in the north-south direction, and the array has a large field of view. As the Earth rotates, the northern sky is observed by drift scanning. The array is located in Hongliuxia, a radio-quiet site in Xinjiang, and saw its first light in September 2016. In this first data analysis paper for the Tianlai cylinder array, we discuss the sub-system qualification tests, and present basic system performance obtained from preliminary analysis of the commissioning observations during 2016-2018. We show typical interferometric visibility data, from which we derive the actual beam profile in the east-west direction and the frequency band-pass response. We describe also the calibration process to determine the complex gains for the array elements, either using bright astronomical point sources, or an artificial on site calibrator source, and discuss the instrument response stability, crucial for transit interferometry. Based on this analysis, we find a system temperature of about 90 K, and we also estimate the sensitivity of the array.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Foreground Subtraction with a Tensor-Based Oriented Singular Value Decomposition Method for HI Experiments

    astro-ph.IM 2026-08 conditional novelty 5.0 of 10

    A tensor-oriented singular value decomposition can subtract radio foregrounds from 21 cm intensity mapping data while preserving more cosmological signal than standard PCA.

  2. Cosmology with HI Intensity Mapping

    astro-ph.CO 2026-07 accept novelty 4.0 of 10

    SKAO HI intensity mapping forecasts yield competitive LambdaCDM constraints (e.g. H0 to ~0.3 km/s/Mpc optimistic) via power spectrum, BAO, bispectrum and stacking, complementary to CMB and optical surveys.

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