A simulation code for the ionization and heat signals in low-temperature germanium detectors for Dark Matter research

A computation code is presented, allowing numerical simulation and pulse-shapeanalysis of the ionization and heat signals in low-temperature massive Ge detectors for Dark Matter research. The effects on charge collection are pointed out, arising from the Coulomb repulsion of free carriers within the charge clouds. Testexperiments are described, aimed at event localization for improved background rejection.