|Message: Re: strange phisics results||Not Logged In (login)|
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On Wed, 19 Feb 2014 16:45:50 GMT, Bruno Zerbo wrote:
> Hi to all, > I'm doing some simulations to calculate the energy deposited by > electrons of different energy in a silicon layer 1 mm width. > > I developed the code starting from the ones in > examples/extended/electromagnetic/TestEm1 > my detector construction make a world filled by vacuum in which there is > a layer of silicon. > > Electrons are shot with energy varying form 0.5 MeV to 5.5 MeV. > Before I send 1000000 of electrons of 0.5 MeV and I fill an histogram, > then I repeat with energy of 0.75 MeV and I fill another histogram... > and so on until 5.5 MeV. > > These histograms are very strange and something is not going right. > > > I attached some pictures of the histograms plotted. In each of these you > can see a straight line in coincidence with the energy of the electrons > shot to the silicon. I think that this behaviour is not physical and I > can't explain what is coming.
Energy conservation. If e- is totally absorbed, total energy deposit = E incident.
I reproduced your setup with TestEm5. 1MeV.jpeg is 2 e- incidents. 1 is transmitted, 1 is totally absorbed --> 1 MeV
Also, I attach macro and histo at 4 MeV. You can play with this TestEm5 and compare with your results.
Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/20/06.45-89321-1MeV.jpeg http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/20/06.45-27617-bruno.mac.txt http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/02/20/06.45-83593-4MeV.gif
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