APA
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Amiri, M., Chakraborty, A., Foreman, S., Halpern, M., Hill, A., Hinshaw, G., … Wulf, D. (2024). Holographic Beam Measurements of the Canadian Hydrogen Intensity Mapping Experiment (CHIME).
Chicago/Turabian
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Amiri, M., Arnab Chakraborty, Simon Foreman, Mark Halpern, A. Hill, Gary Hinshaw, T. Landecker, et al. “Holographic Beam Measurements of the Canadian Hydrogen Intensity Mapping Experiment (CHIME)” (2024).
MLA
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Amiri, M., et al. Holographic Beam Measurements of the Canadian Hydrogen Intensity Mapping Experiment (CHIME). 2024.
BibTeX Click to copy
@article{m2024a,
title = {Holographic Beam Measurements of the Canadian Hydrogen Intensity Mapping Experiment (CHIME)},
year = {2024},
author = {Amiri, M. and Chakraborty, Arnab and Foreman, Simon and Halpern, Mark and Hill, A. and Hinshaw, Gary and Landecker, T. and MacEachern, Joshua and Masui, K. and Mena-Parra, J. and Milutinovic, N. and Newburgh, Laura and Ordog, A. and Pen, Ue-Li and Pinsonneault-Marotte, T. and Reda, A. and Siegel, Seth R. and Singh, Saurabh and Wang, Haochen and Wulf, D.}
}
We present the first results of the holographic beam mapping program for the Canadian Hydrogen Intensity Mapping Experiment (CHIME). We describe the implementation of the holographic technique as adapted for CHIME, and introduce the processing pipeline which prepares the raw holographic timestreams for analysis of beam features. We use data from six bright sources across the full 400-800\,MHz observing band of CHIME to provide measurements of the co-polar and cross-polar beam response of CHIME in both amplitude and phase for the 1024 dual-polarized feeds instrumented on CHIME. In addition, we present comparisons with independent probes of the CHIME beam which indicate the presence of polarized beam leakage in CHIME. Holographic measurements of the CHIME beam have already been applied in science with CHIME, e.g. in estimating detection significance of far sidelobe FRBs, and in validating the beam models used for CHIME's first detections of \tcm emission (in cross-correlation with measurements of large-scale structure from galaxy surveys and the Lyman-$\alpha$ forest). Measurements presented in this paper, and future holographic results, will provide a unique data set to characterize the CHIME beam and improve the experiment's prospects for a detection of BAO.