Updated Status and Performance of the STIS CCD

Details Updated Status and Performance of the STIS CCD Updated Status and Performance of the STIS CCD

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hstc.worke..49w&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

Performance

Scientific paper

A description is provided of the overall performance of the STIS CCD after HST Servicing Mission 4 (SM4) and during Cycle 17 calibrations. Most aspects of CCD performance are found to be consistent with extrapolations of the trends seen prior to the failure of STIS in August 2004. The gain values for 1 and 4 have not measurably changed from pre-SM4 measures. The read noise through Amp D, as determined from unbinned bias images taken during Cycle 17, is slightly higher than pre-SM4 values. As is expected due to the on-orbit radiation environment the dark current continues to increase. The spurious charge has increased as well and has a slope that results in a smaller value at the top of the chip (near the readout amplifier) when compared to the center of the chip. The charge transfer inefficiency (CTI) also continues to increase although the increasing dark current will noticeably minimize actual CTI losses for typical exposure times exceeding several hundred seconds. The post-SM4 CTI measured values agree well with extrapolation of the trend seen through Cycle 17 calibrations. Changes in the sensitivity of STIS CCD modes have been modest.

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