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Eddington Factors Calculation in Serpent

Posted: Fri Nov 09, 2018 10:39 am
by Ramzy1990
Good Day Everybody,

I wanted to ask about if Serpent has a tally for calculating the required parameters to calculate Eddington Factors? I found that it was done before in Serpent 1.19 by Andrew Hall of UM. Is this capability found in Serpent right now for Version 2.1.30? thank you very much!

Re: Eddington Factors Calculation in Serpent

Posted: Fri Nov 09, 2018 12:18 pm
by Ville Valtavirta
Hi,

I'm not entirely sure what is needed for the calculation of Eddington factors, but I understand it has something to do with weighting tallied fluxes with the angular direction. Serpent has the capability to add directional/angular weighting to detector tallies: http://serpent.vtt.fi/mediawiki/index.p ... al#det_dir

Perhaps you can say if that is enough or if something additional is needed.

-Ville

Re: Eddington Factors Calculation in Serpent

Posted: Fri Nov 09, 2018 7:38 pm
by Ramzy1990
Hello Dr. Ville,

I am not entirely sure really, but the following website http://montecarlo.vtt.fi/mtg/2015_Knoxv ... w_Hall.pdf has some more information. What I understood is that during the scoring of the flux in Serpent, I will have to add more tallies that additionally weight the angular flux by direction. Would that be possible for example by including the direction vector in the detectors? Would I need 9 different oriented vectors to get the required matrix mentioned in the above file?

Re: Eddington Factors Calculation in Serpent

Posted: Tue Nov 13, 2018 12:32 pm
by Ville Valtavirta
The use of the direction vector in the detector might be enough for getting the diagonal terms in the tensor.

I don't know how exactly Andrew tallied the off-diagonal terms.

-Ville

Re: Eddington Factors Calculation in Serpent

Posted: Thu Nov 15, 2018 4:48 am
by Ramzy1990
Ah yes I did not notice that a vector for xy might be similar to yx for e.g.! So the diagonal terms would use vectors of the forms (1 0 0) (0 1 0) (0 0 1) in the Detector direction vector. I will look into it soon if God will and I will keep you posted too sir.

Thank you very much,

Ramzy