  The effects of space charge due to slowly drifting ions can be relevant for
detectors operated at high intensity, or for relatively low values of the bias
voltage. Accurate measurements have been obtained with the liquid krypton
calorimeter of the NA48 experiment, from data collected in 1997. The build-up
of space charge takes place during the first part of the beam extraction burst,
and causes a dependence of the response on the transverse coordinate of the
axis of electromagnetic showers, and a small reduction of average amplitude.
The effects are well reproduced by a computation, where the only free parameter
is the value of the ion mobility. The model can be applied a wide range of
operating conditions, and generalized to detectors with different geometry and
active medium.
