Computer Science – Performance
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010fym..confp..62k&link_type=abstract
"The First Year of MAXI: Monitoring Variable X-ray Sources", Poster Presentations, 4th International MAXI Workshop held November
Computer Science
Performance
Scientific paper
MAXI was launched in July, 2009 and observation started from August,2009. MAXI/SSC consists of 32 CCDs each of which is 1 inch square. The CCD is usually working in parallel sum mode (64-binning). When the ISS passes through the South Atlantic Anomaly (SAA), where the background is high, the MAXI/SSC stops observation. Furthermore, the MAXI/SSC doesn't observe when the Sun is near the FOV. This is because the day time image shows the saturation in the electronics on the edge of the CCD and the background is quite different from that of the night time image. In the result, the observation time of the MAXI/SSC is about 30% of one day. The MAXI/SSC has calibration source at the edge of CCDs which radiates Mn-K X-rays. In addition, collimator origin Cu-K emission line can be seen. The gain and energy resolution of the CCD is continuously monitored both by the Mn-K X-rays and by the Cu-K X-rays. In Mn-K X-rays, the energy resolution of the CCD is 147eV(FWHM) at the time of launch. The FWHM at the Cu-K line is gradually decreasing. In this poster, we report the performance of the MAXI/SSC in orbit.
Daikyuji Arata
Kimura Masashi
Kitayama Hiroki
Matsuoka Masaru
Tomida Hiroshi
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