Trend of Dark Rates of the COS and STIS NUV MAMA Detectors

Details Trend of Dark Rates of the COS and STIS NUV MAMA Detectors Trend of Dark Rates of the COS and STIS NUV MAMA Detectors

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hstc.worke..47z&link_type=abstract

"2010 Space Telescope Science Institute Calibration Workshop - Hubble after SM4. Preparing JWST, held 21-23 July 2010 at Space T

Computer Science

Scientific paper

The dark rate of the STIS NUV MAMA detector was about an order of magnitude higher after SM4 repair than anticipated, with an initial rate of 0.01 count sec^-1 pixel^-1. Measurements over the past year show a dual-component exponential decline with e-folding timescales of o 30 and 300 days. The most recent measurements show a rate of 2.8 × 10^-3 count sec^-1 pixel^-1. The dark rate of the COS NUV detector started at a very low value of 6 × 10^-5 count sec^-1 pixel^-1, and has displayed a steady increase, approaching the ground-tested level of 3.7 × 10^-4 count sec^-1 pixel^-1. Still, the rate of COS NUV detector is considerably lower than that of its STIS counterpart. The rates for both detectors are sensitive to detector and tube temperatures, and the rate fluctuations can be fit with an empirical model.

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