Abstract
A model has been constructed to study the electrode current characteristics of the resistive sheet type of two-dimensional position sensitive silicon detector (2D-PSD) including those with a low-resistance ring around the central high-resistance area. The 2D-PSD is modelled as a regular mesh of discrete resistors connected at their nodes via capacitors to a common plane; a solution of the individual node voltages for short time steps allows for a determination of the electrode currents. Position reconstruction non-linearities and energy signal ballistic deficit have been investigated for various values of surface, ring and electrode termination resistances by integrating the current pulses from a simulated particle hit. It has been found that for a 2D-PSD with capacitance, C, and a ring resistance of 1 10 th of surface resistance, R □, the position signals should be allowed to develop for ≈ R □C 5 seconds in order to obtain 1% non-linearity (rms) in the position pattern, and the energy signal for longer than 2R □C 5 seconds for less than 1% ballistic deficit. A method is described that allows the model results to be used to correct position non-linearities that arise during experimental measurements.
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