[fluka-discuss]: Usimbs routine help ?

From: Benjaminas Marcinkevicius <b.marcinkevicius_at_gmail.com>
Date: Tue, 4 Feb 2014 21:36:57 +0200

I am new to FLUKA and FORTRAN so my issue might be trivial but still.

1. I'm trying simplified beam dump geometry. I am using usimbs.f routine to
bias neutrons in radial direction. the routine was taken from example i got
and i modified to my problem. It seems to work and no errors that i noticed
are issued, but the neutrons do not penetrate deeper than R=340 cm. I tried
500 and 5000 particle runs and it seems that neutrons do not go further. I
haven't found any mistakes in geometry or material so thought maybe my
modification of routine was wrong.

This is link to nps=5000 run and usimbs.f routine. includes eps file with
comparison of neutron dose rate with 500 nps and 5000 nps.


2. In total energy balance in run summary it is written that 11.9 % of
energy missing, I was wondering what is the reason of this mismatch.

Any help is appreciated.
Benjaminas Marcinkevičius
Received on Tue Feb 04 2014 - 21:44:14 CET

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