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The FUV detector for the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope is a limited resource and must be managed carefully in order to prolong its life. This includes implementing multiple Lifetime Positions (LPs) in order to have spectra fall at different positions on the detector and adjusting the high voltage to minimize the extracted charge. The detector model used to predict how the gain evolves with time has become more sophisticated since launch and is used for both short and long-term planning. One limitation of the model is our incomplete understanding of how the response of a region on the detector is affected by factors such as the applied high voltage, shape of the pulse height distribution, modal gain, and previous usage. With more than fourteen years’ worth of data available for analysis, we can now improve our understanding of the effects of these items and enhance our predictive capabilities. We will discuss our investigation of how they affect the model and address the possibility that we may be able to recover data from heavily gain sagged regions of the detector.
Conference Presentation
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
David J. Sahnow andChristian I. Johnson
"Improved characterization of pulse height changes in the far ultraviolet detector of the cosmic origins explorer (COS)", Proc. SPIE 12678, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXIII, 126780W (5 October 2023); https://doi.org/10.1117/12.2677617
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David J. Sahnow, Christian I. Johnson, "Improved characterization of pulse height changes in the far ultraviolet detector of the cosmic origins explorer (COS)," Proc. SPIE 12678, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXIII, 126780W (5 October 2023); https://doi.org/10.1117/12.2677617