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Proceedings Paper

Characterization, modeling, and management of the COS FUV detector lifetime
Author(s): 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
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Paper 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.

Paper Details

Date Published: 26 September 2013
PDF: 6 pages
Proc. SPIE 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII, 88590S (26 September 2013); doi: 10.1117/12.2024708
Show Author Affiliations
David J. Sahnow, Space Telescope Science Institute (United States)
Alessandra Aloisi, Space Telescope Science Institute (United States)
K. Azalee Bostroem, Space Telescope Science Institute (United States)
John Debes, Space Telescope Science Institute (United States)
Justin Ely, Space Telescope Science Institute (United States)
Philip E. Hodge, Space Telescope Science Institute (United States)
Gerard Kriss, Space Telescope Science Institute (United States)
Derck Massa, Space Telescope Science Institute (United States)
Cristina Oliveira, Space Telescope Science Institute (United States)
Rachel Osten, Space Telescope Science Institute (United States)
Steven N. Osterman, Univ. of Colorado (United States)
Steven V. Penton, Space Telescope Science Institute (United States)
Charles Proffitt, Space Telescope Science Institute (United States)
Julia Roman-Duval, Space Telescope Science Institute (United States)
Paule Sonnentrucker, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 8859:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII
Oswald H. Siegmund, Editor(s)

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