Date: Thu, 14 Jun 2018 13:37:28 +0000
Dear Alexander,
I didn’t check your problem but please consider to revise your geometry since there are a lot of errors, as shown in the attached snapshot.
Best, luigi
[cid:52DE017E-F120-4B17-9EAE-7BF29FC11E9F_at_cern.ch]
From: <panov_at_dec1.sinp.msu.ru<mailto:panov_at_dec1.sinp.msu.ru?Subject=Re%3A%20%5Bfluka-discuss%5D%3A%20Symmetry%20breaking%20in%20generation%20of%20soft%20gammas%20(%3F)>>
Date: Sat, 09 Jun 2018 23:48:51 +0300
Dear FLUKA experts,
I studied a simple model for one future cosmic-ray space mission and
found a very strange phenomenon.
My model is a flat and wide (330 cm) tungsten-scintillator calorimeter
equipped with four layers of silicon matrix detectors. Silicon detectors
are matrices of silicon pads 1x1cm^2 each, size of layers is 69x69 cm^2.
The construction is clear from the picture in the file Scheme.pdf. The
beam of 100 GeV electrons was normal to the surface of the calorimeter
and crossed exactly the center of the silicon detectors and the center
of the calorimeter (it is X=0, Y=0 point; Z axis is directed from down
to up). The distances from the top of the calorimeter to the silicon
layers were 0.1cm, 20 cm, 40 cm and 60 cm for the layers Si3, Si2, Si1,
Si0 respectively (see Scheme.pdf).
Naturally, one should expect axially symmetric shower in the calorimeter
in this configuration. But actually it is not the case. It is clearly
seen from the portraits of the events in the silicon matrices. I send
with this letter 10 examples of event portraits for each of the two
directions of electron beam. The scattered particles strongly prefer the
positive directions of X and Y axis both for particles scattered forward
(see the file Book-e-100GeV-reverse-00000-00009.pdf) and backward (see
the file Book-e-100GeV-direct-00000-00009.pdf) directions. I suppose
that the majority of these asymmetric particles are soft secondary
gammas. All these look like symmetry breaking in generation of such soft
gammas (?).
This symmetry breaking is a very serious problem for me since I must
study the distribution of backscattered particles, but I can't do it due
to this symmetry breaking. Can you help me? I send all my files (*.inp
included) in the archive SymmetryBreaking.zip
Thank you in advance,
Alexander
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