Maximizing COS Detector Lifetime: Gain Sag and the Selection of a New Detector Lifetime Position for the FUV Channel on the Cosmic Origins Spectrograph

Details Maximizing COS Detector Lifetime: Gain Sag and the Selection of a New Detector Lifetime Position for the FUV Channel on the Cosmic Origins Spectrograph Maximizing COS Detector Lifetime: Gain Sag and the Selection of a New Detector Lifetime Position for the FUV Channel on the Cosmic Origins Spectrograph

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924117s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #241.17

Astronomy and Astrophysics

Astronomy

Scientific paper

The Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) uses a two-segment, large-format microchannel plate (MCP) detector with a cross delay line anode in its Far Ultraviolet (FUV) channel. Local gain variations in the MCPs, due to the much greater illumination of some areas of the detector, is now evident, and complicates the extraction of the science data. These effects will become more severe in the future as the detector exposure increases. Therefore, we are now preparing to move the spectra to an alternate position by the summer of 2012 in order to extend the lifetime of the detector. We will discuss mitigation strategies implemented both onboard HST and in the calcos calibration pipeline to improve the quality of the spectra collected at the current position, and describe the tests conducted in order to identify and characterize several alternate lifetime positions. Finally, we will discuss our plans for the initial calibration program at the next location.

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