On the charge dividing mechanism in position sensitive detectors

The principle of operation of the one dimensional position sensitive detector is investigated by means of a simple model describing the detector as a line of a continuously distributed junction capacitance C and resistance R of the back layer. It is shown that a linear relationship exists between the position of the incident particle and the total charge collected at the position contact of the detector. The kinetics of the charge collected at the position and energy contact were computed. The rise times of the charge pulses (10–90%) are found to vary with the position of incidence up to about RC/4 sec.