Galactic Cosmic Ray simulation

Source Definition
1

I would like to simulate the interaction of primary cosmic ray with my detector with Flair. To do it I have started from the example present in Fluka removing the simulation of the atmosphere. I have few questions:
To simulate GCR is sufficient to define SPECSOUR and GCR-SPE with NO-NORM option?
I read that I have to link DPMJET, how can I do it?
If in the SPECSOUR it is possible to define injection radius of the CR. given the fact that my setup is small can I set a relative small radius to just include my setup and no more?

Thanks a lot for the support.
Stefano

nisp.inp (3.9 KB)
nisp.flair (7.8 KB)

3

I manage to run the code. Now I need to understand the results. I am using the NO_NORM and I am using USRBDX to score the the protons entering in a sphere around my detector. In the _sum.lis file I read

Detector n: 1 ( 1 ) inprot
(Area: 1.13097298 cmq,
distr. scored: 1 ,
from reg. 4 to 5 ,
one way scoring,
current scoring)

 Tot. resp. (Part/cmq/pr)  0.4401482      +/-  2.9510301E-02 %
 ( -->      (Part/pr)      0.4977957      +/-  2.9510301E-02 % )

How do I have to interpret the normalisation of the data?
I know that protons are ~90% of the total GCR flux, so what does it mean that there are 0.497 protons/primary?

Thanks a lot
Stefano

4

Dear @sdusini ,

When using the NO-NORM option, you would need to take care of the normalization of the result in post-process.

This topic has been addressed in the post below:
GCR extended layers and scoring through mgdraw file - Advanced Features and User Routines - FLUKA User Forum.

Regards,
Angelo