The LEGEND Germanium Simulation Chain

LegendGeSim is a multi-purpose tool that can be used for anything from visualizing detector geometry to simulating raw files with realistic data-like waveforms that mimic data and are compatible with data processing tools.

The path towards a data-like raw hdf5 file starts from simulating the detector itself for given geometry and environmental conditions; then simulating pulses based on given information on energy depositions; and finally, simulating the effects of the DAQ chain.

The chain can be used for any step in this path independently: visualize detector geometry, simulate fields, simulate ideal pulses, or finally, simulate realistic data-like waveforms. Each step is described in a corresponding Manual and Tutorial section.

The tiers of the simulation are pet->stp->pss->raw where

• pet tier: input information on position, energy amd time of the depositions
• stp tier: stepping information, currently clustering, removing events reconstructed outside of the detector and with zero energy. In the future things like pile-up may go here
• pss tier: ideal pulses simulated by SolidStateDetectors or siggen
• raw tier: simulated realistic waveforms in hdf5 format that mimics data raw tier