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Proceedings Paper

Phase correction for ALMA
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Paper Abstract

We discuss the use of the water vapour radiometry technique for atmospheric phase correction as applied to the Atacama Large Millimetre Array (ALMA). The atmospheric conditions derived from site test instrumentation are summarised, and the nature of the phase correction problem quantified. We then present calculations of the expected errors in the radiometrically-corrected atmospheric phase, based on estimates of the radiometer sensitivity. These results indicate how well we need to know the atmospheric structure in order to make accurate phase estimates, and have implications for the meteorological instruments needed on the site. Finally we present the results of simulations of daytime turbulence on the site, and use these to predict the phase fluctuations due to wet and dry air, and discuss their implications for phase correction at Chajnantor.

Paper Details

Date Published: 23 June 2006
PDF: 12 pages
Proc. SPIE 6267, Ground-based and Airborne Telescopes, 62671Y (23 June 2006); doi: 10.1117/12.671389
Show Author Affiliations
Alison Stirling, Met Office (United Kingdom)
John Richer, Cavendish Lab. (United Kingdom)
Richard Hills, Cavendish Lab. (United Kingdom)
Juan Pardo, Consejo Superior de Investigaciones Cientificas (Spain)

Published in SPIE Proceedings Vol. 6267:
Ground-based and Airborne Telescopes
Larry M. Stepp, Editor(s)

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