STIS CCD Anneals

Details STIS CCD Anneals STIS CCD Anneals

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stis.rept....6h&link_type=abstract

Instrument Science Report STIS 98-06-Revision A, 14 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph

Scientific paper

In this ISR we outline the comprehensive monitoring program has been underway for the STIS CCD dark current since STIS was installed on HST (February 1997). This program consists of monitors of darks, biases, the growth of hot pixels, and the affect that annealing has on the elimination of these hot pixels. We outline in this ISR the outcome of the analysis of the utility of the anneal process for the STIS CCD. We find that the STIS CCD has grown a number of hot persistent pixels (i.e., hot pixels which do not anneal away). We also find that we continue to grow hot pixels at a constant rate. We also find that the STIS CCD does anneal new hot pixels at the ~80% rate which is comparable to that reported by the WFPC2 group, and that we see at brightness cuts greater than 1 e/sec a flattening of the growth rate of new hot pixels, though no flattenning is seen at lower levels (e.g., > 0.1 e/sec) . We also find that the average post-anneal dark count-rate is now 0.0068 e/sec.

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