Characterization, modeling, and management of the COS FUV detector lifetime

David J. Sahnow; Alessandra Aloisi; K. Azalee Bostroem; John Debes; Justin Ely; Philip E. Hodge; Gerard Kriss; Derck Massa; Cristina Oliveira; Rachel Osten; Steven N. Osterman; Steven V. Penton; Charles Proffitt; Julia Roman-Duval; Paule Sonnentrucker

doi:10.1117/12.2024708

26 September 2013 Characterization, modeling, and management of the COS FUV detector lifetime

David J. Sahnow, Alessandra Aloisi, K. Azalee Bostroem, John Debes, Justin Ely, Philip E. Hodge, Gerard Kriss, Derck Massa, Cristina Oliveira, Rachel Osten, Steven N. Osterman, Steven V. Penton, Charles Proffitt, Julia Roman-Duval, Paule Sonnentrucker

Author Affiliations +

Proceedings Volume 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII; 88590S (2013) https://doi.org/10.1117/12.2024708
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

The Far Ultraviolet (FUV) detector of the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) uses a large-format, two-segment microchannel plate detector with a Cross Delay-Line anode. Since the installation of COS into HST in 2009, the detector’s properties have continually evolved, and changes to both sensitivity and microchannel plate gain have been observed. In order to maximize the lifetime of the detector, we have been monitoring its local properties as a function of time, cumulative exposure, and other factors, and we have constructed models to predict its future evolution. These models will allow us to actively manage the microchannel plate high voltage levels and the location of the spectra on the detector in order to extend its life without limiting its scientific use. We are also tracking the global sensitivity of the detector, which has been decreasing since installation; the rate of degradation has been found to vary with time, and appears to be correlated with solar activity.

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David J. Sahnow, Alessandra Aloisi, K. Azalee Bostroem, John Debes, Justin Ely, Philip E. Hodge, Gerard Kriss, Derck Massa, Cristina Oliveira, Rachel Osten, Steven N. Osterman, Steven V. Penton, Charles Proffitt, Julia Roman-Duval, and Paule Sonnentrucker "Characterization, modeling, and management of the COS FUV detector lifetime", Proc. SPIE 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII, 88590S (26 September 2013); https://doi.org/10.1117/12.2024708

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KEYWORDS

Sensors

Microchannel plates

Ultraviolet radiation

Spectrographs

Calibration

Hubble Space Telescope

Airglow

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