Properties of PACE-I HgCdTe Detectors in Space - the NICMOS Warm-up Monitoring Program

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  • 11 July 2000
Abstract
We summarize the results of a monitoring program which was executed following the cryogen exhaustion of the NearInfrared Camera and MultiObject Spectrometer (NICMOS) onboard the Hubble Space Telescope. During the subsequent warm-up, detector parameters such as detective quantum efficiency, dark current, bias offsets, and saturation levels have been measured over the temperature range 62 K to about 100 K. The measurements provide a unique database of the characteristics of PACE-I HgCdTe detector arrays in the space environment. A surprising result of the analysis is the fact that all three NICMOS detectors showed an enhanced dark current in the temperature range between 77 K and 85 K. We discuss possible explanations for this unexpected behavior.

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