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Question Counting hits 

Keywords: Countig particle hits
Forum: Hits, Digitization and Pileup
Date: 06 Feb, 2002
From: Rui Bugalho de Moura <>

Hi everyone,

I want to count optical photons arriving at an APD surface.

Do I need to make the G4LogicalBorderSurface or the G4LogicalVolume (of the APD) a Sensitive Detector?

At present I'm attempting to count the optical photons in my UserSteppingAction method, where I check whether or not an optical photon has crossed the G4LogicalBorderSurface between pre and post step points. Is there a more elegant way to do this?

I also need to store the counts along side with the optical photons initial position, to histogramm the counts against their initial z coordinate. I'm not using hits for this, since I'm not extracting any physical information, I'm just counting the photons. Should I use hits?

I pretend to histogram through the ROOT's CINT interface. Can I store my data points to a file? Or do I need to book my histograms in my GEANT4 code?

If I am to store my data points to a file, where in my simulation code is more appropriate to do it? At EndOfEventAction? (I also noticed there is no GEANT4 library to deal with files. Is this true?)

I'm sorry if some of the questions aren't supposed to be in this "Hits, Digitization and Pileup" group.

Thanks in advance anyway, for any advice you can give me.

Best regards,

Rui Moura

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1 None: Re: Counting hits   (Makoto Asai - 28 Feb, 2002)
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