Hello
Results from USRBIN by region are not normalized. Fluka does not calculate
the volume of each region. On the contrary, results from cartesian or
r-phi-z binning are normalized per cm^3, since the bin dimensions are
known to the code.
Regards
Paola
> Dear experts,
>
> Iam a Fluka beginner and Iam using the DPA-SCO card to evaluate the number
> of displacements per atom in an accelerator target irradiated with
> protons. Previous SRIM simulations gave me a dpa value of ~50dpa/year for
> protons, Fluka simulations gave me a value of ~1000 dpa/year for protons
> (both values are with respect to the average beam current). So far I
> thought this huge discrepancy (~factor 50) is due to the fact that SRIM
> lacks the prediction of nuclear reactions, however these seem not to play
> a huge role for my simulations.
>
> I have evaluated the dpa with the USRBIN card for the whole region (region
> binning) of interest (the target) with the following input sequence:
>
> --------------------------------------------------------------
>
> USRBIN 12. DPA-SCO -21. TAR
> DPATARPr
> USRBIN TAR
> &
> AUXSCORE 2.0 PROTON
> DPATARPr
>
> --------------------------------------------------------------
>
> In order to clarify the discrepancy above further I have done a simulation
> with one single bin inside the region (target), which means I evaluate the
> whole region and that should lead to the same result as the region binning
> in principal or? The input sequence part for that is shown in the
> following lines:
>
> --------------------------------------------------------------
>
> USRBIN 11. DPA-SCO -21. 5.64
> 100.5DPAtarPr
> USRBIN 0.0 100.0 1.
> 1.0 &
> AUXSCORE 2.0 PROTON DPAtarPr
>
> --------------------------------------------------------------
>
> However, the value I obtain then seems to be much more correct with
> respect to my SRIM simulation, with ~20dpa/year. It is interesting, that
> the factor between these values (1000 and 20) is ~50, which is exactly the
> volume of the region (target). Once the geometry with all regions and
> bodies is properly defined without any errors (and that is the case) Fluka
> should automatically take the according volume or? Is it necessary to
> divide dpa values obtained with a region binning and the DPA-SCO card by
> the value (without units) of the volume of the corresponding region? If
> so, why does Fluka not automatically perform that division?
>
> I would be very thankful if someone is able to answer my question or could
> give me a hint.
>
> Kind regards,
>
> Niklas Ophoven
>
>
>
>
>
>
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> Prof. Dr. Sebastian M. Schmidt
> ------------------------------------------------------------------------------------------------
> ------------------------------------------------------------------------------------------------
>
>
Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148
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Received on Sun Mar 01 2020 - 23:17:53 CET