XRT CCD Spot Detection after 13th bakeout

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Presentation transcript:

XRT CCD Spot Detection after 13th bakeout N. Narukage (ISAS/JAXA)

Difference of spot map between after 8th and 13th bakeout white pixels : created spots black pixels : disappeared spots On the basis of this difference image, the number of white and black pixels is comparable (the actual number is described in next slide). It is likely that there is no spot creation and growth. XC = 1024, YC = 1024 XS=512, YS = 512

Summary of bakeouts # date duration (ON ~ OFF) Interval baking monitor Quadrant G-band data loss white pixels black pixels spot ratio to full CCD spot created? 12th 2008/07/11 18 hrs 3 weeks G-band Q, 44 ms Q, 64ms 0.4 % 0.0 % 0.27 % 0.25 % 0.28 % 5.26 % 5.24 % N 13th 2008/08/05 3.5 weeks Q, 44 ms 5.23 % Q : quadrant C : center only white pixels : created spots compared with after 8th bakeout black pixels : disappeared spots compared with after 8th bakeout

Summary of bakeouts # date duration (ON ~ OFF) Interval baking monitor Quadrant G-band data loss white pixels black pixels spot ratio to full CCD spot created? 5th 2008/02/21 24 hrs 2 weeks N Q, 44 ms 0.4 % -- 5.31 % 6th 2008/03/06 18 hrs C, 64 ms No quadrant observation 7th 2008/03/27 3 weeks C, 64 ms Q, 44 ms quadrant observation was performed 1 week after 7th bakeout 8th 2008/04/17 0.0 % reference 5.26 % 9th 2008/05/15 4 weeks Q, 64 ms 0.26 % 0.27 % 5.25 % 10th 2008/05/29 Q, 44 ms Q, 64 ms 0.0 % 0.0 % 0.28 % 0.27 % 0.25 % 0.26 % 5.29 % 5.27 % N N 11th 2008/06/19 G-band 0.29 % 0.27 % 5.30 % 5.28 % Q : quadrant C : center only white pixels : created spots compared with after 8th bakeout black pixels : disappeared spots compared with after 8th bakeout