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Proceedings Paper

ALMA temporal phase stability and the effectiveness of water vapor radiometer
Author(s): Satoki Matsushita; Koh-Ichiro Morita; Denis Barkats; Richard E. Hills; Edward B. Fomalont; Bojan Nikolic
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Paper Abstract

We present the temporal phase stability of the entire ALMA system. We first verified the temporal phase stability: We observed a strong quasar for a long time (a few tens of minutes), derived the temporal structure function after the atmospheric phase correction using the water vapor radiometers (WVRs), and confirmed that the phase stability of all the baselines reached the ALMA specification. We then verified frequency transfer between bands: We observed a bright quasar and switched between the two frequency bands, and confirmed that the phase returned to the original values within the phase fluctuation. In addition to these results, we also studied the effectiveness of the WVR phase correction at various frequencies, baseline lengths, and weather conditions.

Paper Details

Date Published: 10 October 2012
PDF: 7 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84443E (10 October 2012); doi: 10.1117/12.925872
Show Author Affiliations
Satoki Matsushita, Academia Sinica (Taiwan)
Koh-Ichiro Morita, ALMA (Chile)
Denis Barkats, ALMA (Chile)
Richard E. Hills, ALMA (Chile)
Edward B. Fomalont, National Radio Astronomy Observatory (United States)
Bojan Nikolic, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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