Science Impact of a NewCoating for the WFC3 CCDUVIS Channel

Details Science Impact of a NewCoating for the WFC3 CCDUVIS Channel Science Impact of a NewCoating for the WFC3 CCDUVIS Channel

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000wfc..rept....6d&link_type=abstract

Instrument Science Report WFC3 2000-06, 5 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3

Scientific paper

We assess the science impact of using a new coating for the reflective elements of WFC3.The new coating, LLNL EUVHRS, increases the throughput of the instrument at opticalwavelengths at the expense of the UV, compared with the currently planned MgF2 coatedaluminum. Two possibilities have been identified, namely to use the new coating only onthe pick-off mirror of WFC3 (single surface) or to use it on all its reflective elements (3surfaces). The single reflection improves the throughput by approximately 7% at the optical wavelength (about 550 nm). However, it is 20% less efficient in the UV (at about 250nm), than the current coating. The 3 surfaces reflection is 23% more efficient in the opticaland about 70% less efficient in the UV. We calculate that adopting the new coating will allow WFC3 to carry out the DRM science programs with less total telescope time than required with the current coating.

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