ITA-JPN Broadband VLBI Experiment for Optical Clock Comparison

Date Issued
2019
Author(s)
Sekido, M.
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Takefuji, K.
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Ujihara, H.
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Hachisu, H.
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Nemitz, N.
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Pizzocaro, M.
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Clivati, C.
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Calonico, D.
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Ido, T.
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Tsutsumi, M.
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Kawai, E.
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Namba, K.
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Okamoto, Y.
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Takahashi, R.
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Komuro, J.
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Ichikawa, R.
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Ishijima, H.
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Bregolin, F.
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Levi, F.
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Cantoni, E.
•
Cerretto, G.
•
•
•
•
•
Mura, Alberto
Abstract
NICT has developed a broadband VLBI (very-long-baseline interferometry) system for intercontinental frequency transfer. After domestic tests in Japan, a 2.4 m diameter VLBI station was exported and installed at Medicina astronomy observatory of INAF in Italy in 2018. We have started VLBI experiments for optical clock comparison on an Italy-Japan intercontinental baseline. Reference signals generated by an ytterbium (Yb) optical lattice clock at INRiM in Torino and by a strontium (Sr) lattice clock at NICT headquarters in Koganei are compared by a series of links, which include a coherent optical fiber link between INRiM and Medicina and intercontinental VLBI observation between Medicina and Koganei. A series of VLBI experiments was performed from Oct. 2018 to Feb. 2019. Yb and Sr lattice clocks were repeatedly operated throughout the same period for frequency comparison.
Coverage
Proceedings of the 24th European VLBI Group for Geodesy and Astrometry Working Meeting
All editors
Haas, Rüdiger; García-Espada, Susana; López Fernández, José Antonio
Start page
52
Conferenece
24th European VLBI Group for Geodesy and Astrometry Working Meeting
Conferenece place
Las Palmas de Gran Canaria, Spain
Conferenece date
17-19 March, 2019
Uri
Url
Ads BibCode
2019evga.conf...52S
Rights
open.access
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