Due to high energy resolution and position sensitivity features, the multi-electrode high purity germanium (M-HPGe) detector is widely applied in rare event physics for events extraction.

This study aims to make use of pulse shape in M-HPGe detector as a useful reference to optimize the performance of gamma spectrometry, rare events detection and signal/background discrimination of M-HPGe detector in other scenarios.

The pulse shape of inductive charge at different readout electrodes in M-HPGe detector was simulated by joint calling process of Monte Carlo simulation process and single point position energy deposition pulse waveform simulation. Then, the pulse shape in M-HPGe detector was estimated through the distribution of the internal electric field, the weighting potential inside the detector, the carrier track and the inductive charge at the readout electrode.

Simulation results of pulse shape in M-HPGe detector show that the collector electrodes along the electrodes distribution induces significantly different inductive signals, and weak mirror signals are induced by the adjacent electrodes. This indicates that the M-HPGe detector has position resolution feature along the electrodes distribution.

This method can be used to support the research on the physical mechanism of the gamma track reconstruction discrimination method, and it can also simulate and evaluate the application effect of the track reconstruction discrimination method.