Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ingn....9...37l&link_type=abstract
The Newsletter of the Isaac Newton Group of Telescopes (ING Newsl.), issue no. 9, p. 37-37.
Physics
Observing Time, Ing Telescopes, Isaac Newton Telescope, William Herschel Telescope
Scientific paper
Over the years the instrument suite at the WHT has changed many times. One constant in all these changes is that our intermediate dispersion spectrograph ISIS continues to win the largest share of the observing time across all our three TACs. It's therefore good to see some improvements coming to this venerable instrument. The past 6 months have seen the commissioning of a new dichroic beam splitter, and initial tests indicate that the infamous ripples which plagued the old dichroic set are substantially reduced. Throughput in both blue and red arms is improved, while the response of the new blue fold mirror is also substantially better than before. This is the only dichroic which will be offered in service mode, and will be the default dichroic offered to visiting observers unless an alternative is specified. It is expected that the older dichroics will be phased out of use pending feedback from users.
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