Search found 2324 matches

by Jaakko Leppänen
Tue Nov 24, 2020 1:08 pm
Forum: Gamma transport
Topic: Photo-nuclear reactions
Replies: 1
Views: 30

Re: Photo-nuclear reactions

Unfortunately photo-nuclear reactions are not included in 2.1.31 or the main development branch.
by Jaakko Leppänen
Mon Nov 16, 2020 2:00 pm
Forum: Bug reports
Topic: Reading ACE data
Replies: 6
Views: 2053

Re: Reading ACE data

It seems that there is something wrong with the nubar data. The six precursor groups are defined, but the decay constants are off (the first is 1.0 and the rest are zeros). The error comes from the energy distribution of delayed neutrons in the second group. Does MCNP print anything about the delaye...
by Jaakko Leppänen
Mon Nov 16, 2020 11:39 am
Forum: Users
Topic: Microscopic XS of Boron-10
Replies: 4
Views: 48

Re: Microscopic XS of Boron-10

Your detector definition means that you are integrating the product of flux and microscopic (n,alpha) cross section of material B10 over material mod_cold_0B and energy intervals specified by bin structure two_group. The result is divided by the result of detector 1. So if detector 1 is the correspo...
by Jaakko Leppänen
Fri Nov 13, 2020 7:27 pm
Forum: Bug reports
Topic: Reading ACE data
Replies: 6
Views: 2053

Re: Reading ACE data

It's impossible to tell what the problem is based on the error message alone. I can take a closer look if the ACE file small enough to share?
by Jaakko Leppänen
Tue Nov 10, 2020 2:05 pm
Forum: Users
Topic: Pin power distribution with detector
Replies: 3
Views: 82

Re: Pin power distribution with detector

It seems that the fuel pins in the assemblies are in a regular lattice, right? I think the easiest way would be to define four mesh detectors (11 x 11 x 25 cells), one covering each assembly position. When you combine the mesh detector with dr -8 void, you automatically get the fission power in each...
by Jaakko Leppänen
Tue Nov 10, 2020 1:16 pm
Forum: Users
Topic: Pin power distribution with detector
Replies: 3
Views: 82

Re: Pin power distribution with detector

When you are scoring the power distribution, you don't need to divide the result by flux. So the dt entry is not necessary in the second detector. How exactly is your 2x2 assembly geometry set up? What is lattice 216 that you are refering to in the detector card?
by Jaakko Leppänen
Wed Nov 04, 2020 10:45 am
Forum: Users
Topic: About Burnup value convergence
Replies: 3
Views: 117

Re: About Burnup value convergence

Which code version are you using? Could you post the complete input here?
by Jaakko Leppänen
Mon Nov 02, 2020 5:12 pm
Forum: Bugs, problems, questions & feeback
Topic: Infinite tracking loop error associated to photons
Replies: 3
Views: 85

Re: Infinite tracking loop error associated to photons

The energy is also off-scale (3.5 GeV). Do you have an external source definition? If so, check the units (Serpent uses MeV).
by Jaakko Leppänen
Mon Nov 02, 2020 5:09 pm
Forum: Users
Topic: Scale / color distribution of flux mesh plot
Replies: 1
Views: 53

Re: Scale / color distribution of flux mesh plot

At the moment there is no option to output the scale. You can get the numerical values using mesh detectors and plot the same images with Matlab.
by Jaakko Leppänen
Mon Nov 02, 2020 4:46 pm
Forum: Bugs, problems, questions & feeback
Topic: Infinite tracking loop error associated to photons
Replies: 3
Views: 85

Re: Infinite tracking loop error associated to photons

This is most likely related to delta-tracking and high rejection probability in the low-density plasma. There is an option to switch off the error completely:

http://serpent.vtt.fi/mediawiki/index.p ... set_inftrk

have you tried that?