Re: FLUKA crashing

From: Alfredo Ferrari <>
Date: Tue, 12 Jul 2011 21:46:16 +0200

Dear Francesca

the error is in the cylindrical binning n. 13 "2rd50d" (and also the
following cylindrical, R-Phi-Z, binnings). The lowest radius is set
at -1.9, which makes no sense (radii must be >= 0), and cause the
calculation of the bin volume to end up in 0 -> a division by zero
when normalizing the output of that binning

Change the minimum radius value to 0 (assuming this is what you want)
in all R-Phi-Z binnings and everything should be ok.

BTW we should protect this case...


| Alfredo Ferrari || Tel.: + |
| CERN-EN/STI || Fax.: + |
| 1211 Geneva 23 || e-mail: |
| Switzerland || |

On Tue, 12 Jul 2011, Francesca Nessi-Tedaldi wrote:

> Dear Mario,
> thank you for your reply. I am CCing Alfredo, who added Lutetium into the library, in case he might have some hint. He added the cross sections to the library for the latest respin, thus this shouldn't be the reason, as far a I understand.
> Cheers
> Francesca
> On 12 Jul 2011, at 19:21, Santana, Mario wrote:
>> Francesca,
>> I did a quick test and found out that you are directly using LUTETIUM although there is not low energy neutron cross section in FLUKA for that element. This is causing FLUKA to crash. You need to associate some other element low energy neutron cross section to avoid the crash, please look at
>> Also you are redefining some elements that are already in FLUKA database (up to 25), maybe you don't want to do that. Check the following info:
>> Please use these hints to keep debugging your file as I suspect there maybe other problems. However, I have no idea why you were able to run before when you dind't have negative decay times.
>> Mario
>> ________________________________________
>> From: [] On Behalf Of Francesca Nessi-Tedaldi []
>> Sent: Monday, July 11, 2011 4:00 AM
>> To: fluka-discuss
>> Subject: FLUKA crashing
>> Dear FLUKA experts,
>> I have a simulation crashing on me while it is writing out an ASCII output (unit 81). It doesn't seem to depend on the number of events, nor on the random number.
>> These are cards I used before, to successfully calculate the residual activation at different cooling times.
>> The only change now is, that I have foreseen two subsequent irradiations in the irradiation profile and I am asking also for negative DCYTIMES, to get activation values between the two.
>> I attach a tar with all related files. I would be glad for some help, since I have no clue...
>> Best regards
>> Francesca
Received on Wed Jul 13 2011 - 17:01:37 CEST

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