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Note Counting optical photons 

Keywords: countig photons
Forum: Fast Simulation, Transportation & Others
Date: 12 Feb, 2002
From: Rui Bugalho de Moura <>

Hi everyone,

I'm simulating hundreds of optical photons in a scintillator, with two APD's attached to it. I want to count photons arriving at the APD on top (APD1) and the photons arriving at the APD on bottom (APD2).

Presently I have a Data singleton class with two int data members (APD1 and APD2 counters), and some other useful stuff like a ThreeVector which holds the position where the optical photons were generated. This class saves the data to a specified file at EndOfEventAction and prints last data to screen at EndOfRunAction. I my PrimaryGeneratorAction I set my data threevector to the generation position (of particle gun), and in my SteppingAction I check whether or not the particle (which can only be an optical photon) crosses a G4LogicalBorderSurface. If it does I check the name of that surface against the name of the name of APD1 and APD2 surface to know if I should increment my data class respective counters.

At the end I pretend to use the data file(s) to generate some histograms within the cint interface of root.

If someone has an opinion or comment about this, or more logic or easier or elegant way to do this, I'm glad to hear it.

Thank's in advance.

Best regards,

Rui Moura

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