Specification and Application of the MAMA Additive Image (MADDIM) to Track Charge Extraction

Details Specification and Application of the MAMA Additive Image (MADDIM) to Track Charge Extraction Specification and Application of the MAMA Additive Image (MADDIM) to Track Charge Extraction

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stis.rept...30w&link_type=abstract

Instrument Science Report STIS 98-30, 20 pages

Physics

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

Scientific paper

Incident photons extract charge from the channels of the Micro-Channel Plate of the STIS MAMA detectors. Continued exposure leads to a decrease in the gain and a subsequent drop in the detective quantum efficiency (DQE). Ground tests of MAMA tubes show that the rate of loss of DQE is dependent not only on the total amount of charge extracted, but also on the rate. Plots are shown for the DQE loss v. exposure time for MAMA detectors and a fit to the data is used to derive the DQE loss in terms of detected rate. An archiving system has been set up to collect images from both the STIS MAMA detectors of the total number of detected counts and the DQE loss, the latter derived from the count rate. These files are referred to as MADDIM images and are designated with the suffix _oma. Collection of these data were begun in October 1997. The _oma files for each week are summed into a running total to produce the lifetime count and DQE loss images (designated by life_). Plots of the life_ images can be used to determine strategies for placement of spectra on the detector and could be used to adjust the pixel flat fields if substantial DQE loss has occurred, which is not the case in the 400 days so far monitored.

Affiliated with

Also associated with

No associations

Rating

Specification and Application of the MAMA Additive Image (MADDIM) to Track Charge Extraction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Specification and Application of the MAMA Additive Image (MADDIM) to Track Charge Extraction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Specification and Application of the MAMA Additive Image (MADDIM) to Track Charge Extraction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1648506