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28 August 2014Improving JWST science productivity by changing the detector reset mode
For large space missions maximizing the time spent observing science targets by minimizing overhead increases the
scientific return of the mission. On the James Webb Space Telescope (JWST), the baseline mode of resetting the near
infrared detectors is a pixel-by-pixel reset. For the Hawaii-2RG detectors this requires 10.5 seconds. Over the life of the
mission, 2-3% of the total time is spent performing these resets. In this paper, we investigate using the much faster row-by-
row reset mode of the Hawaii-2RG as an alternative. Resets in this mode can be performed in only 40 milliseconds
allowing more time for science. We investigate how the changing of the reset modes affects: thermal stability of the
detectors, total noise, and observed persistence after bright sources are observed. Overall, any negative side effects seem
to be outweighed by the increase in the available exposure time for science during the lifetime of JWST.
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Michael W. Regan, Rachel Anderson, Eddie Bergeron, Douglas Long, "Improving JWST science productivity by changing the detector reset mode," Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91433U (28 August 2014); https://doi.org/10.1117/12.2059825