Re: [fluka-discuss]: Low energy neutrons - Floating point exception

From: Alfredo Ferrari <alfredo.ferrari_at_cern.ch>
Date: Thu, 14 Nov 2013 18:04:52 +0100

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?


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| 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 |
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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 - 19:01:32 CET