|Message: Re: Replica and energy density deposition||Not Logged In (login)|
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On Sun, 12 Jul 2009 22:14:57 GMT, Olivier Dadoun wrote:
> Hello Michel, > > thank you for your answer. > > I found also the same results concerning the energy per unit of length > (along the beam axis propagation). > > My problem is more on the transverse plane: > > What will you obtain for the energy density if you now apply some > segmentations on the tranverse plane?
TestEm11 has no lateral segmentation, but TestEm2 has (cylindrical geometry). Dadoun.txt is a cylinder of tungsten, radius 3 X0 (X0=3.5 mm) radial segmentation dr= 52 um, 105 um, 210 um. Plot of dE/dr distribution in attachement.
Apart for the first bin (central cylinder), the distributions are identical. In fist bin, energy density is dependent of the bin size (here radius), as you observed. Variation ~30% from 52 um to 210 um. For small cell size, this effect is inherent to multiple scattering and cannot be avoid.
However the effect must be relativised. More signifiant is the total energy deposited within a cylinder of given radius. See second plot. Total energy deposited within radius ~0.1 X0 is almost identical for the 3 segmentations.
Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/07/15/03.50-33067-dadoun.txt http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/07/15/03.51-60046-dadoun.pdf
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