Computer Science – Performance
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1824t&link_type=abstract
American Astronomical Society, HEAD meeting #9, #18.24; Bulletin of the American Astronomical Society, Vol. 38, p.385
Computer Science
Performance
Scientific paper
The XIS is an X-ray Imaging Spectrometer system, consisting of four sets X-ray CCD cameras, three XISs have a front-illuminated (FI) CCD, and the other has a back-illuminated (BI) CCD. First, we report the calibration status of the basic performances of the gain, energy resolution, quantum efficiency and their time evolution. We have implemented a Charge Injection (CI) technique and found to work as a column-to-column level CTI monitor. Preliminary results from onboard experimental usage show that low energy tail component due to the column-to-column variation of CTI seen in the redistribution function for a narrow emission line is successfully compensated. The CI technique is also used for active compensation for the CTI, in which we fill sacrificial charge in radiation-induced traps by injecting charge at every 50-200 column. We report results from the trial usages of it, which we are planning now. We have experienced unexpectedly contamination on the optical blocking filters of XIS, which has caused significant decrease of low energy efficiency. Using low energy sources and day earth data, we are monitoring the time history of the thickness of the contamination. We report on the current status of the contamination.
Suzaku XIS Team
Tsuru Takeshi G.
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