[asac][almanews] ALMA Memo 495 Released

[Stacy Oliver]

ALMA Memo # 495

Estimated Performance of the Water Vapour Radiometers 

Richard Hills (Cavendish Laboratory, Cambridge, UK) 

2004-06-14

Keywords: Phase COrrection, Water Vapour Radiometer 

The sensitivity and accuracy to be expected from the ALMA water vapour
radiometers is estimated. Even with quite pessimistic assumptions about
noise temperature and gain stability, it appears that the sensitivity of the
present design is at least a factor of 2 better than the specifications. It
is more difficult to predict the medium term stability and accuracy that
will be achieved, but the indications are that these will not be a limiting
factor in using the data from the radiometers. An estimate of the errors
that would occur in correcting the single-dish pointing for the effects of
water vapour gradients is also given. 

View a pdf version of ALMA Memo #495. 
http://www.alma.nrao.edu/memos/html-memos/alma495/memo495.pdf


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