Resistive or Capacitive Charge-Division Readout for Position-Sensitive Detectors

Authors: A. Pullia, W.F.J. Müller, C. Boiano, and R. Bassini
Published: Proceedings of the 2001 Nuclear Science Symposium and Medical Imaging Conference, San Diego, California, November 4-10, 2001
IEEE Trans. Nucl. Sci. 49(2002)3269
Abstract: Two-point charge division is a typical technique for position measurements in linear multi-electrode detectors (microstrips, multi-wire proportional counters, silicon driftdetector arrays, scintillators coupled to photodetectors). Only two preamplifiers, located at the right and the left ends of the detection array, are used, each of which receives a fraction of the charge produced by the ionizing event. Position is reconstructed comparing these charge fractions. In principle either a resistive or a capacitive divider may be used to split the charge. The choice between such two different setups is not obvious. In fact each of them shows advantages and disadvantages in terms of noise, signal propagation, linearity. In this paper we present a unified treatment for the capacitive and the resistive mechanisms of charge division which addresses the issues of this choice. As an example the realistic setup of the multi-wire position-sensitive proportional counter to be used in the TP-MUSIC III chamber of the ALADiN experiment at GSI is considered.
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