WFC3 UVIS Crosstalk Images

Details WFC3 UVIS Crosstalk Images WFC3 UVIS Crosstalk Images

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004wfc..rept...11b&link_type=abstract

Instrument Science Report WFC3 2004-11, 20 pages

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Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Uvis, Crosstalk

Scientific paper

This report summarizes the behavior of the Wide Field Camera 3 UVIS channel crosstalk features seen in the first ground-test data from the integrated instrument. There appear to be two types of crosstalk: the first arises from sources at any exposure level (from a few DN up to saturation); the crosstalk from a source in one amp appears in the three other amps as mirror images of the source. The second type arises from highly saturated pixels only; in these cases, the crosstalk appears in the adjoining amp of the same CCD as the source. Both types of crosstalk are highly nonlinear, occur at very low levels (<10DN/ pixel at the default gain of 1.5), and depend upon the bias level, gain, and pixel binning settings. A software workaround to eliminate some of the crosstalk is currently in hand in the form of timing patterns with alternate clamp times. The hardware cause for some of the crosstalk, a common-mode noise susceptibility in the CCD electronics box, has been identified and successfully fixed in the non-flight hardware; the problem is expected to be fixed in the flight hardware later this year. Meanwhile, further tests are underway at the Detector Characterization Lab (DCL at GSFC) to explore additional possible causes of crosstalk in the camera head electronics.

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