Here it is.
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/5750.html
There are 2 arrays which contain energy boundaries and cumulative fluxes
for generating source neutrons with energies from 1.0D-14 to 1.69D-02 GeV.
The next thing is coordinate sampling for generating cylindrical beam.
> Dear Artem
>
> predefined hydrogen/nitrogen/air/water etc are used routinely with no
> problem in many many problems! There must be something specific in your
> setup (do you use a source routine?) which screws up the neutron
> transport for those materials. From the backtrace you sent, apparently you
> have a neutron at exactly "0" energy....
>
> Coudl you send the input file and possibly associated user routines?
>
>
> +----------------------------------------------------------------------+
> | Alfredo Ferrari || Tel.: +41.22.76.76119 |
> | CERN-EN/STI || Fax.: +41.22.76.69474 |
> | 1211 Geneva 23 || e-mail: Alfredo.Ferrari_at_cern.ch |
> | Switzerland || |
> +----------------------------------------------------------------------+
>
> On Thu, 14 Nov 2013, Artem Zontikov wrote:
>
>> Hi again,
>> I tried to reproduce this error by attaching different particles to the
>> BEAM card. Other input cards, geometry and SOURCE subroutine were
>> unchanged. It seems it works fine with PHOTON, ELECTRON, POSITRON and
>> PROTON. So, my guess - the error described above (in case of NEUTRON)
>> has
>> something with neutron cross-sections for nitrogen (as I mentioned it is
>> possible to eliminate the problem by attaching other cross-section via
>> LOW-MAT card).
>> I am just wondering if someone tried to run this example? Have you got
>> any
>> warnings in *.out files? Maybe they differ from mine or the problem is
>> with the fortran compiler, operating system, etc...
>>
>>
>>> Dear users and experts,
>>>
>>> I've just faced a problem with simulating low-energy neutrons
>>> penetrating
>>> in some pre-defined materials. Fluka 2011.2b-4 crashes with floating
>>> point
>>> exception when pre-defined hydrogen or nitrogen is used (or compounds
>>> with
>>> them - i.e. water or air) as a material. Here is an information from
>>> debug and all other files are in the attachment:
>>>
>>> Program terminated with signal 8, Arithmetic exception.
>>> #0 kasneu_ (ekin=0x99487a8, pla=0x9948840, wate=0x9948860,
>>> txx=0x9948848,
>>> tyy=0x9948850, tzz=0x9948858, xx=0x9948740, yy=0x9948748,
>>> zz=0x9948750,
>>> llo=0x9948714, mmreg=0x9948700, ldcynt=0x9943934, ierr=0x9943874)
>>> at kasneu.f:631
>>> #1 0x0811507b in kaskad_ (ierr=0x9943874) at kaskad.f:3844
>>> #2 0x08107841 in feeder_ (kendcn=0x98c9f5c) at feeder.f:257
>>> #3 0x0804e46f in flukam_ (iflgeo=0x8661a98) at flukam.f:3150
>>> #4 0x08049492 in MAIN__ () at fluka.f:289
>>> #5 0x08661989 in main ()
>>>
>>> Other pre-defined materials do not reproduce this error. Using LOW-MAT
>>> option with other material's cross-section attached to hydrogen or
>>> nitrogen makes error to disappear as well.
>>>
>>> Looking for any help, thanks in advance.
>>
>>
>
Received on Thu Nov 14 2013 - 20:51:13 CET