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The European Space Agency's Gaia mission is scheduled for launch in 2013. Itwill operate at L2 for 5 years, rotating slowly to scan the sky so that its twooptical telescopes will repeatedly observe more than one billion stars. Theresulting data set will be iteratively reduced to solve for the position,parallax and proper motion of every observed star. The focal plane contains 106large area silicon CCDs continuously operating in a mode where the linetransfer rate and the satellite rotation are in synchronisation.  One of the greatest challenges facing the mission is radiation damage to theCCDs which will cause charge deferral and image shape distortion. This isparticularly important because of the extreme accuracy requirements of themission. Despite steps taken at hardware level to minimise the effects ofradiation, the residual distortion will need to be calibrated during thepipeline data processing. Due to the volume and inhomogeneity of data involved,this requires a model which describes the effects of the radiation damage whichis physically realistic, yet fast enough to implement in the pipeline. Theresulting charge distortion model was developed specifically for the Gaia CCDoperating mode. However, a generalised version is presented in this paper andthis has already been applied in a broader context, for example to investigatethe impact of radiation damage on the Euclid dark-energy mission data.

An Analytical Model of Radiation-Induced Charge Transfer Inefficiency for CCD Detectors