Search found 114 matches

by jesse.johns
Wed Dec 02, 2015 10:58 pm
Forum: Users
Topic: detector/universe
Replies: 8
Views: 2805

Re: detector/universe

Hi there, No, not really. As you have it defined, it is integrated over all energy and over the specified volume. So, in effect, you're computing the total length travelled by all the neutrons per second. To get the flux, you need to divide that value by the volume you're integrating over. This can ...
by jesse.johns
Wed Dec 02, 2015 10:47 pm
Forum: Users
Topic: Fission source convergence
Replies: 6
Views: 2737

Re: Fission source convergence

Hi,

The three columns represent, col 1: specific cycle keff, col 2 : averaged keff,an col 3: the standard deviation.
by jesse.johns
Thu Sep 24, 2015 11:24 pm
Forum: Bugs, problems, questions & feeback
Topic: Analog reaction rate estimators question
Replies: 8
Views: 5408

Re: Analog reaction rate estimators question

Where's my head... I apologize, I read the post incorrectly and jumped to conclusions. (I was thinking of the default few cross-sections, which I even got backwards)
by jesse.johns
Tue Sep 22, 2015 9:34 pm
Forum: Bugs, problems, questions & feeback
Topic: Analog reaction rate estimators question
Replies: 8
Views: 5408

Re: Analog reaction rate estimators question

Hello,

[redacted to prevent any confusion]

Cheers,

Jesse
by jesse.johns
Fri Sep 11, 2015 2:26 am
Forum: Bugs, problems, questions & feeback
Topic: Group constant genration effect on k_eff
Replies: 6
Views: 5433

Re: Group constant genration effect on k_eff

Hello,

The reported standard deviation is only the 68% confidence interval. I think the differences you see are the statistical uncertainties.

Jesse
by jesse.johns
Fri Sep 11, 2015 2:15 am
Forum: Bugs, problems, questions & feeback
Topic: LAMBDA in the Delayed Neutron Parameters Output
Replies: 5
Views: 7005

Re: LAMBDA in the Delayed Neutron Parameters Output

Hello Sasha, It is my understanding that LAMBDA is the delayed neutron decay constant (units of 1/s), where the total delayed neutron decay constant is the first term and the six groups are the following terms. This corresponds directly with BETA_EFF. The neutron lifetimes you are looking for will b...
by jesse.johns
Thu Sep 03, 2015 1:06 am
Forum: Development
Topic: Calculate Volumes of Cells
Replies: 4
Views: 1387

Re: Calculate Volumes of Cells

Ahh, right. Especially with region divisions.

That considered, I think it might not be as useful, generally, as I had thought. The material definitions do allow one the flexibility to essentially determined how the volume is computed.
by jesse.johns
Tue Sep 01, 2015 6:44 pm
Forum: Development
Topic: Calculate Volumes of Cells
Replies: 4
Views: 1387

Re: Calculate Volumes of Cells

Hi Ville, Yes, I specifically mean the cell volumes. It's easy enough to make many unique materials, then compute the material volumes - which then correspond to the cell volume. Since this is a process I do quite regularly, I figured it might be a useful suggestion. I often deal with pretty complex...
by jesse.johns
Thu Aug 27, 2015 10:54 pm
Forum: Bugs, problems, questions & feeback
Topic: BUMAT outputting scattering cross-section
Replies: 2
Views: 3824

Re: BUMAT outputting scattering cross-section

This works well. Thank you!
by jesse.johns
Thu Aug 27, 2015 7:18 pm
Forum: Bugs, problems, questions & feeback
Topic: Inconsistent volumes between output (.out) and -checkvolumes
Replies: 4
Views: 4206

Re: Inconsistent volumes between output (.out) and -checkvolumes

Hi Aki, That statement is still valid. You can either hand calculate the volumes or you can use the options specified here: http://ttuki.vtt.fi/serpent/viewtopic.php?f=24&t=1779&p=4098&hilit=volume&sid=2937b2c606125080a14a85165acc6cfd#p4098 However, I would only use this to verify the hand-computed ...