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Holography map Oct 7 1999 large scale errors
Large scale surface errors (Oct 7 1999)
Image of the large scale errors of the JCMT dish on October 7 1999 just after
a dish adjustment.
The measurement was made between 05:15 and 07:15 hrs in the early morning before
sunrise. During the last 15 minutes however, the sun had risen above the ridge and
was illuminating the dish.
The rms of the large scale surface errors, from holography, is 8.5 microns.
Note however that the above map does not include
systematic errors from the holography system itself, or from imperfections of the
panels such as surface roughness and scalloping..
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