Fe sources.
These are installed in the CCD holder over small
holes that permit them to illuminate all four corners of both CCDs.
This will permit us to monitor changes in the
system gain and CTE.
In order to calibrate the energy response of the instrument in flight
and to monitor radiation damage to the CCDs, which shows up as decreased
CTE (charge transfer efficiency), the camera contains
four small Fe sources.
These are installed in the CCD holder over small
holes that permit them to illuminate all four corners of both CCDs.
This will permit us to monitor changes in the
system gain and CTE.
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