Search found 65 matches

by Tuomas Viitanen
Mon Dec 10, 2012 12:06 pm
Forum: Gamma transport
Topic: Libraries
Replies: 5
Views: 3186

Re: Libraries

Hi, With a little Googling I found this package containing gamma libraries in ACE format from the OECD/NEA Databank: http://www.oecd-nea.org/tools/abstract/detail/nea-1837 Another source for ACE gamma libraries is the MCNP distribution package (if you have the licence) and, of course, you can proces...
by Tuomas Viitanen
Thu Nov 08, 2012 6:01 pm
Forum: Bugs, problems, questions & feeback
Topic: "TMP" Option
Replies: 9
Views: 5816

Re: "TMP" Option

The on-the-fly Doppler Broadening based on the explicit treatment of target motion at collision sites has been preliminarily implemented in Serpent and can be activated with line set dop 2 in the input. However, an error was found from the handling of elastic scattering events with on-the-fly Dopple...
by Tuomas Viitanen
Wed Nov 07, 2012 5:27 pm
Forum: Bugs, problems, questions & feeback
Topic: "TMP" Option
Replies: 9
Views: 5816

Re: "TMP" Option

Hi again, We (in practice, Jaakko...) managed to find and fix at least one issue with the Doppler-preprocessor routine in Serpent versions 2.x.x. The problem appears when using the same ACE data for a nuclide in multiple temperatures. As a result of the problem, the same xs data becomes broadened mu...
by Tuomas Viitanen
Wed Nov 07, 2012 3:38 pm
Forum: Bugs, problems, questions & feeback
Topic: "TMP" Option
Replies: 9
Views: 5816

Re: "TMP" Option

Hello,

We are actually trying to fix this (or a very similar) issue right now. I noticed the same thing just yesterday. Stay tuned...

Tuomas
by Tuomas Viitanen
Tue Sep 11, 2012 9:51 am
Forum: Input
Topic: Two new methods for choosing inventory nuclides
Replies: 9
Views: 8067

Two new methods for choosing inventory nuclides

Hello, As many of you know, the depletion output includes many useful quantities such as spontaneous fission rate, decay heat production and radiotoxicity in the system being examined. The results are printed for material and system totals together with nuclide-wise values for nuclides in the invent...
by Tuomas Viitanen
Tue Aug 28, 2012 11:37 am
Forum: Users
Topic: Reproducing runs
Replies: 2
Views: 1610

Re: Reproducing runs

Dear Mathieu, I quess this issue should not be related to the exceeding of the lenght of the random number sequence for two reasons: 1) The length of the sequence in Serpent 1 is 2^48, which is of the order 1E14. Hence, exceeding the length of the sequence in your case with 1E8 neutrons would requir...
by Tuomas Viitanen
Fri May 18, 2012 11:00 am
Forum: Users
Topic: MCNP with Serpent XS
Replies: 1
Views: 1472

Re: MCNP with Serpent XS

Hi! The error message says that there are coincident (or nearly coincident?) energy points in the probability table data of U-235, U-238, Pu-238 and Pu-239. Evidently, MCNP4 cannot handle this and, hence, the sampling of unresolved region cross sections fails. The coincident energy grid points origi...
by Tuomas Viitanen
Wed Sep 28, 2011 10:16 am
Forum: Compiling and installing Serpent
Topic: Compiling LibGD
Replies: 6
Views: 12666

Re: Compiling LibGD

Hello, Disclaimer: I don't understand very much of Linux operating systems or differences between different Linux distributions, so this might not work for you. I installed LibGD on my Ubuntu 10.14 (Lucid Lynx) using the Synaptic package manager available in Ubuntu Linux. If openSUSE has such a mana...
by Tuomas Viitanen
Mon Sep 19, 2011 6:15 pm
Forum: Users
Topic: Zirconium Hydride
Replies: 3
Views: 2175

Re: Zirconium Hydride

Hello, If you are not familiar with NJOY, I quess the easiest way to get the thermal scattering libraries for ZrH is straight from the NEA Data Bank. It provides many different libraries meant for MCNP, but Serpent uses the same ACE cross section format. For example this package should do the trick ...
by Tuomas Viitanen
Fri Sep 02, 2011 7:39 pm
Forum: Bug reports
Topic: Doppler-preprocessor & threshold reactions
Replies: 0
Views: 1898

Doppler-preprocessor & threshold reactions

Hello, A semi-severe bug was found in the current implementation of the Doppler-preprocessor of Serpent (activated by a tmp card in the material definition). The bug concerns threshold reactions for which the ACE data is cropped (ACE data for the reaction is only available for E > threshold) and is ...