Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942216k&link_type=abstract
American Astronomical Society, AAS Meeting #219, #422.16
Astronomy and Astrophysics
Astronomy
Scientific paper
The GMOS-N CCDs have been recently upgraded with new e2v deep-depletion devices, replacing the original EEV CCDs in use since the instrument was commissioned in late 2001. These new detectors have improved sensitivity in both the red and the blue, and were immediately used for queue observing while commissioning and detector on-sky characterization proceeded in parallel. These devices provide an incremental, yet significant upgrade which will be followed by the planned replacement of the focal plane with fully-depleted Hamamatsu red and blue sensitive devices. The interim e2v upgrade was designed to satisfy the needs of the Gemini scientific community in a timely fashion until issues encountered with the Hamamatsu CCD upgrade could be more fully addressed. Here, we present a project status update on the GMOS-N CCDs upgrade project, including details of the e2v deep-depletion CCD installation and plans for the eventual Hamamatsu upgrade. We discuss some of the complications and lessons learned during the course of the Hamamatsu project, and present the current schedule for installation of the Hamamatsu CCDs. In addition to further improved QE in the red, the Hamamatsu project will deliver faster readout times, 10% more spectral coverage, and improved detector controller software providing integrated support for nod & shuffle. By combining multiple CCDs with different anti-reflective coatings, the coming Hamamatsu focal plane array will retain the increased blue sensitivity recently realized by the e2V installation and provide an additional factor of 2 increase in QE longward of 940 nm.
Bombino Stacy
Cavedoni Chas
Chiboucas Kristin
Dunn Jennifer
Gimeno German
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