Speaker
Description
We measure the signal delay of CCD crosstalk using a test stand in preparation for the LSST Camera. We use a collimated beam projector to cast a narrow streak onto the CCD, mimicking a bright satellite track. We measure the strength and delay of the crosstalk signal simultaneously, using a linear (flux-independent) and a non-linear (flux-dependent) model, on individual exposures or on all exposures, respectively. We find stronger crosstalk signals in channels closer to the projected source streak, and weaker signals in more distant channels. We can only measure a sensible signal delay up to 4 channels away, and we find an inverted trend with a smaller delay in nearby channels and larger delay in further-away channels. The measurable signal delays are found to be <0.5 pixels. We further repeat the measurement on a second data set with a different ASPIC Gain configuration in order to locate the source of crosstalk. Unfortunately, the results are yet inconclusive.
Keywords for your contribution subject matter (this will assist SOC in accurately characterizing your contribution)
CCD; Cross-talk
| contribution subject matter | CCD sensors |
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