Sep 3 – 8, 2017
The Open University, Milton Keynes, UK.
Europe/London timezone

Calibration Techniques for CCDs in the Presence of the Brighter Fatter Effect

Sep 5, 2017, 5:45 PM
Berrill Lecture Theatre (OU)

Berrill Lecture Theatre (OU)

The Open University, Walton Hall, Milton Keynes, MK7 6AA


Dr Daniel Weatherill (University of Oxford)


It has become increasingly clear in recent years that dynamic charge
collection effects (notably the "brighter-fatter" effect) are evident and of
interest in thick CCDs. Apart from the implications of these effects on
shape measurement of point sources, and the unclear sensitivity of their
dependence on factors such as incident wavelength and device operating
voltage, it is also somewhat troublesome to perform standard calibration of
parameters such as gain and electrical crosstalk on devices with significant
brighter-fatter contributions. For example: correlations introduced due to
the brighter fatter effect are hard to distinguish from those due to
electrical crosstalk, or even serial charge transfer inefficiency.

After a brief review of existing and previous work about how the brighter-
fatter effect is coupled to measurements of other, more familiar parameters,
a discussion will be presented about the currently known extent of the
inter- dependence between the brighter-fatter effect and the parameters of
gain, crosstalk, noise and charge transfer inefficiency and how these can be
mitigated in post-hoc data analysis. Finally, some new measurement
techniques involving more specialist operation of the CCD during data
acquisition will be discussed, which aim to extract performance parameters
whilst exclusing the brighter-fatter effect.

Primary author

Dr Daniel Weatherill (University of Oxford)


Ian Shipsey (University of Oxford (GB)) Kirk Arndt (University of Oxford (GB))

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