USRDBX scoring errors (energy spectrum of 8 MeV protons through 50 um kapton)

Dear FLUKA experts,

I’m scoring the energy spectrum of 8 MeV protons (pencil beam) transmitted through a kapton window of 50 um thickness. The simulation is set to use10 spawned runs. I keep getting errors in a few of these spawned runs - apparently always four of them.

Looking at the .err files, it seems that an error like this is what is the problem:

Geofar: Particle in region 4 (cell # 0)
in position -1.811317622E+00 -3.964947371E+00 4.999259848E+05
is now causing trouble, requesting a step of 9.998519596E+04 cm

Can you please help me understand what I should amend to avoid such errors?
Thank you in advance.
Kind regards,

I forgot to attach the project. Here it is!

spettro prot bassaE attraverso materiali.inp (1.6 KB)
spettro prot bassaE attraverso materiali.flair (3.9 KB)

Dear Enrico,

if you zoom out, you will see that you have a geometry error (both in +Z and -Z direction), as the error message suggests.


1 Like

Dear David,

great! I wasn’t aware that the error tab in flair reports only the errors within what the graphic windows show. Good to know.

Thank you very much!