| Download | - View final version: A clock stabilization system for CHIME/FRB outriggers (PDF, 1.5 MiB)
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| DOI | Resolve DOI: https://doi.org/10.3847/1538-3881/ac397a |
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| Author | Search for: Mena-Parra, J.ORCID identifier: https://orcid.org/0000-0002-0772-9326; Search for: Leung, C.ORCID identifier: https://orcid.org/0000-0002-4209-7408; Search for: Cary, S.ORCID identifier: https://orcid.org/0000-0003-1860-1632; Search for: Masui, K. W.ORCID identifier: https://orcid.org/0000-0002-4279-6946; Search for: Kaczmarek, J. F.1ORCID identifier: https://orcid.org/0000-0003-4810-7803; Search for: Amiri, M.ORCID identifier: https://orcid.org/0000-0001-6523-9029; Search for: Bandura, K.ORCID identifier: https://orcid.org/0000-0003-3772-2798; Search for: Boyle, P. J.ORCID identifier: https://orcid.org/0000-0001-8537-9299; Search for: Cassanelli, T.ORCID identifier: https://orcid.org/0000-0003-2047-5276; Search for: Cliche, J.-F.ORCID identifier: https://orcid.org/0000-0001-6509-8430; Search for: Dobbs, M.ORCID identifier: https://orcid.org/0000-0001-7166-6422; Search for: Kaspi, V. M.ORCID identifier: https://orcid.org/0000-0001-9345-0307; Search for: Landecker, T. L.1ORCID identifier: https://orcid.org/0000-0003-1455-2546; Search for: Lanman, A.ORCID identifier: https://orcid.org/0000-0003-2116-3573; Search for: Sievers, J. L.ORCID identifier: https://orcid.org/0000-0001-6903-5074 |
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| Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
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| Funder | Search for: Canada Foundation for Innovation; Search for: National Science Foundation |
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| Format | Text, Article |
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| Subject | radio astronomy; radio transient sources; radio pulsars; astronomical instrumentation; very long baseline interferometry |
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| Abstract | The Canadian Hydrogen Intensity Mapping Experiment (CHIME) has emerged as the prime telescope for detecting fast radio bursts (FRBs). CHIME/FRB Outriggers will be a dedicated very-long-baseline interferometry (VLBI) instrument consisting of outrigger telescopes at continental baselines working with CHIME and its specialized real-time transient-search backend (CHIME/FRB) to detect and localize FRBs with 50 mas precision. In this paper, we present a minimally invasive clock stabilization system that effectively transfers the CHIME digital backend reference clock from its original GPS-disciplined ovenized crystal oscillator to a passive hydrogen maser. This enables us to combine the long-term stability and absolute time tagging of the GPS clock with the short- and intermediate-term stability of the maser to reduce the clock timing errors between VLBI calibration observations. We validate the system with VLBI-style observations of Cygnus A over a 400 m baseline between CHIME and the CHIME Pathfinder, demonstrating agreement between sky-based and maser-based timing measurements at the 30 ps rms level on timescales ranging from one minute to up to nine days, and meeting the stability requirements for CHIME/FRB Outriggers. In addition, we present an alternate reference clock solution for outrigger stations that lack the infrastructure to support a passive hydrogen maser. |
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| Publication date | 2022-01-07 |
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| Publisher | IOP
American Astronomical Society |
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| Licence | |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 98c38b57-d765-4c75-bc1a-fc2257308172 |
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| Record created | 2023-09-20 |
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| Record modified | 2023-09-20 |
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