[KIDS] Crosstalk on CCD96 exceeds bias level
Ewout M. Helmich
helmich at astro.rug.nl
Wed Apr 18 12:22:30 CEST 2012
Hi everyone,
We're investigating correcting the crosstalk of OmegaCAM. One issue that
may require action on Paranal is that the crosstalk on CCD#96 (upto -600
ADU from CCD#95) exceeds the bias level of ~400 ADU in CCD#96. See the
attached plot. Pixels exceeding ~50000ADU in CCD#95 will put that pixel
to 0 in CCD#96, destroying the information there (this in the absense of
sky background, the background in the attached example is about 100 ADU,
in g'). I see two ways to address this:
1) We can mask pixels with value 0 in CCD #96 (will have to for existing
data).
2) The bias level of CCD #96 can be increased by e.g. 300-600 ADU.
The question is if there are objections from a scientific point of view
to this bias level increase.
Regards,
Ewout
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