Hello George,
Thank you very much for your help. My simulation works OK. I have read manual but I don't use neutrons. I use only photons. I don't understand why works.
Best regards,
Adrian
Best regards,
Adrian
________________________________________
Od: George Kharashvili <georgek_at_jlab.org>
Wysłane: 31 października 2017 14:03
Do: Knyziak Adrian
DW: FLUKA Discussion List; Mario Santana
Temat: Re: [fluka-discuss]: problems with materials (too short time of simulation)
Hello Adrian,
Your input is missing the LOW-MAT card for selecting the low energy neutron cross-sections to be used with GRAPHITE.
The manual page for this card has exactly a graphite example.
Regards,
George
--
George Kharashvili
Jefferson Lab Radiation Control
757-269-6435
----- Original Message -----
From: "Mario Santana" <msantana_at_slac.stanford.edu>
To: "Knyziak Adrian" <a.knyziak_at_gum.gov.pl>, "FLUKA Discussion List" <fluka-discuss_at_fluka.org>
Sent: Monday, October 30, 2017 2:56:36 PM
Subject: Re: [fluka-discuss]: problems with materials (too short time of simulation)
Hi Adrian,
I couldn’t quite understand what your issue is. Nor did I get the attachment in a usable way.
Do you mean that the ‘Total CPU time’ does not depend on the number of events (=primaries?)?. It should, but bear in mind that it is also a stochastic variable and it could fluctuate substantially for simulations that haven’t converged, i.e. short simulations, and/or simulations with strong biasing.
Also, the total CPU time for very short simulations (number of primaries <<) may be dominated by the preprocessing time, i.e. the time FLUKA takes to ‘digest’ your input, generate tables, etc. After that, it should scale to the number of primaries.
Finally, in your subject you write ‘too short time of simulation’, which makes me think that your simulations may not have finished successfully at all. Please check your output file for errors messages and check if you got any meaningful/converged results for your scoring cards.
-Mario
> On Oct 30, 2017, at 3:58 AM, Knyziak Adrian <a.knyziak_at_gum.gov.pl> wrote:
>
> Dear Fluka Experts and Users,
>
> I have problem with material (graphite). For diffrent material for example carbon, time of simulation is correct. For graphite is shorter and doesn't depends on number of events. For both of cases simulation finshed OK.
>
> Best regards,
> Adrian
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Received on Thu Nov 02 2017 - 10:43:52 CET