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The CCD is run at a stabilised temperature of 150K. This temperature was chosen for optimum overall performance taking into account dark current, readout noise and charge transfer efficiency.
At least two hours should be allowed before serious observations are made following the switch-on of the CCD camera. This is because of a charge injection effect that is apparent for the first few hours of operation after power up and which is observed as an excessive dark current count.
The cosmic ray detection rate is approximately 15 events/1000 seconds over the whole chip.