XRT CCD Spot Detection after 13th bakeout

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XRT CCD Spot Detection after 13th bakeout

• N. Narukage (ISAS/JAXA)

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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 1024XS512, YS 512
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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 msQ, 64ms 0.4 0.0 0.27 0.25 0.27 0.28 5.26 5.24 N N
13th 2008/08/05 18 hrs 3.5 weeks G-band Q, 44 ms 0.0 0.25 0.28 5.23 N
Q quadrant C center only
white pixels created spots compared with after
8th bakeoutblack pixels disappeared spots
compared with after 8th bakeout
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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 N
6th 2008/03/06 18 hrs 2 weeks N C, 64 ms No quadrant observation No quadrant observation No quadrant observation No quadrant observation
7th 2008/03/27 24 hrs 3 weeks N C, 64 msQ, 44 ms quadrant observation was performed1 week after 7th bakeout quadrant observation was performed1 week after 7th bakeout quadrant observation was performed1 week after 7th bakeout quadrant observation was performed1 week after 7th bakeout
8th 2008/04/17 24 hrs 3 weeks N Q, 44 ms 0.0 reference reference 5.26 N
9th 2008/05/15 24 hrs 4 weeks N Q, 64 ms 0.0 0.26 0.27 5.25 N
10th 2008/05/29 24 hrs 2 weeks N Q, 44 msQ, 64 ms 0.0 0.0 0.28 0.27 0.25 0.26 5.29 5.27 NN
11th 2008/06/19 24 hrs 3 weeks G-band Q, 44 msQ, 64 ms 0.0 0.0 0.29 0.27 0.25 0.26 5.30 5.28 NN
Q quadrant C center only
white pixels created spots compared with after
8th bakeoutblack pixels disappeared spots
compared with after 8th bakeout