Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1999-09-14
Physics
High Energy Physics
High Energy Physics - Experiment
11 pages, 11 figures, talk presented at CALOR99
Scientific paper
10.1016/S0168-9002(98)01193-0
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.
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