Monitoring the Charge Transfer Inefficiency of ACIS and the Impact of the Varying Cosmic-Ray Background

Details Monitoring the Charge Transfer Inefficiency of ACIS and the Impact of the Varying Cosmic-Ray Background Monitoring the Charge Transfer Inefficiency of ACIS and the Impact of the Varying Cosmic-Ray Background

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.4333g&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #43.33; Bulletin of the American Astronomical Society, Vol. 32, p.1265

Computer Science

Performance

Scientific paper

Soon after launch, the Advanced CCD Imaging Spectrometer (ACIS), one of the focal plane instruments on the Chandra X-ray Observatory, suffered radiation damage from exposure to soft protons during passages through the Earth's radiation belts. Since mid-September 1999, ACIS has been protected during radiation belt passages and there is a continuing effort to prevent any further damage particularly from coronal mass ejections or other geomagnetic activity. Monitoring the charge-transfer inefficiency (CTI) of the CCDs using observations of the ACIS external calibration source can be an effective tool to detect any change in performance, however this measure and the instrument performance are also dependent on the total amount of charge deposited onto the CCD, which is dominated by cosmic rays. An increasing rate of cosmic ray hits will reduce the number of electron trap vacancies and thus decrease the measured CTI. We report on efforts by the ACIS Instrument team to understand and quantify the affect of the cosmic ray background on the measured CTI of the ACIS CCDs. We also report on attempts to remove the variation due to the background component from ACIS CTI measurements in order to monitor the health of the instrument.

Affiliated with

Also associated with

No associations

Rating

Monitoring the Charge Transfer Inefficiency of ACIS and the Impact of the Varying Cosmic-Ray Background 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 Monitoring the Charge Transfer Inefficiency of ACIS and the Impact of the Varying Cosmic-Ray Background, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Monitoring the Charge Transfer Inefficiency of ACIS and the Impact of the Varying Cosmic-Ray Background will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-873699