Modelling of diamond particle detectors: temperature dependence of the trapping and detrapping phenomena

摘要

We have built up a computer simulation of the detection mechanism for particles in diamond detectors. A detector with the interdigitated strip geometry is considered in this paper. Minimising ionizing particles produce approximately 36 electron-hole pairs per micrometre along their path, which traverses the full thickness of the detector and alpha particles produce a large number of electron-hole pairs within a few micrometres of the surface. Under an applied electric field, the carriers move through the material and they induce charge on each electrode. By applying the Shockley-Ramo theorem we calculate this induced charge, which gives rise to the signal in an external circuit. In diamond, many of the carriers are trapped at defects in the material. They may recombine or be released at later times and continue their path contributing further to the signal. We have included these effects in the simulation and we have investigated the temperature dependence of the response of the detector.