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Keywords: assembly volume imprints
Forum: Geometry
Re: Question creating volumes with 'holes' using G4AssemblyVolume (Mario)
Re: Feedback Re: creating volumes with 'holes' using G4AssemblyVolume (Gabriele Cosmo)
Date: 26 Jun, 2007
From: Mario <Mario>

I checked the volume overlap before, but did it again to make sure, there
are no overlaps when making the imprint of the assembly (each added volume
was made with a non-vacuum material on the logical volume (whole_log with 
material set to vacuum), or any overlap when placing whole_log.  I have played
with the parameters a little more, and I think that maybe my understanding 
of how the code functions is off. The reason I thought that the assembly 
wasn't working was that I had set whole_log as a sensitive detector, 
and that at every hit, I took the pre- and post- step points and 
asked it to print out the material at that point, but for all the points 
it was vacuum, (the material of whole_log), and not that of the mesh 
substrate (non-vacuum material).  However, by making the mesh thicker the 
difference in scattering through the mesh is very apparent, so the particles
must be noticing that they are going through something which is not vacuum,
but still saying that it is the material of whole_log, and not that of the
imprinted physical volumes made of some non-vacuum material... perhaps this
is a correct interpretation of what is going on... ??? So now the question is
how do I find out that a particular track is going through the mesh hole and
not the substrate if the step points will always say that the material is 
that of whole_log, and that the physical volume at each step is that of the
placed whole_log, and that the energy deposit at each step is 0, because
the material of whole_log is vacuum.... Am I going about this the wrong
way??? Can I use something else, like a G4SubtractionVolume, or something
so that I can somehow distinguish which particles go through the hole and
which through the substrate???  Thanks for the help!!!


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1 None: Re: creating volumes with 'holes' using G4AssemblyVolume   (John Apostolakis - 28 Jun, 2007)
(_ None: Re: creating volumes with 'holes' using G4AssemblyVolume   (Mario - 28 Jun, 2007)
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