3.10. G4Sipm digitizer¶
The purpose of the G4SipmDigitizer is to simulate the SiPM on a single cell basis creating a list of cell breakdowns using the G4SipmHitCollection and the properties of the G4SipmModel.
Since the digitization in Geant4 takes place after the completion of the particle tracking, in this case ray tracing, all needed information is available.
Cell breakdowns or cell triggers are represented by the G4SipmDigi class.
All G4SipmHit instances are transformed into G4SipmDigi instances and sorted chronologically into a list.
The digitization can be enabled/disabled with a macro command:
/g4sipm/digitize/hits 1
In case no G4SipmHit was created, the creation of dark noise can be enabled/disabled:
/g4sipm/noise/ifNoSignal 1
Please also refer to the Geant4 digitization documentation.
3.10.1. Thermal noise¶
Given, the time stamps of the :cpp:class`G4SipmHit`s vary between 
and 
, thermal noise is created.
To ensure a quasi stable state of the SiPM Monte Carlo model, thermal noise is created in a larger time window.
Each cell of the SiPM is allowed to produce a mean number of thermal noise triggers before and after :
/g4sipm/noise/preThermal 3
/g4sipm/noise/postThermal 1
The thermal noise creation can be enabled/disabled with a macro command:
/g4sipm/digitize/hits 1
All thermal noise triggers are added to the chronologically sorted list.
3.10.3. Source¶
-
class
G4SipmDigitizer¶ Digitizer module which creates cell triggers (G4SipmDigi) from hits (G4SipmHit).
Inherits from G4VDigitizerModule