Energy deposition for coupled neutron-photon calculations
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Norbert Schmidt
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May 13, 2020, 5:58:24 PM5/13/20
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Hi all,
I tried to reproduce the simulation of this notebook, attached in the Pull Request #1449,
and I've got different values for the photon heating (the values for
the neutron heating are the same, but the 'heating' tally gives 180
MeV/fission and 'heating-local' gives 198 MeV/fission when used them to
the determine the average amount of fission energy deposited per
fission).
Also, I simulated an infinite medium
of U235 with a monoenergetic photon source of 5 MeV, mentioned as an
older issue in the Pull Requests #1453 and #1462,
and I've got different values for the heating tally with TTB (6.28e5
eV) and LED (6.14e5 eV), which are not only different from each other
but also different from the energy of the source.
I'm
using the develop version of the code and the official nuclear data
libraries (endfb71_hdf5). So, I'd like to know if the Pull Request #1462
is the reason why I get different results than the mentioned notebook,
and how I can get the total energy deposition in an infinite medium.
Thanks in advance,
Norbert
Paul Romano
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May 15, 2020, 4:08:01 PM5/15/20
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to Norbert Schmidt, OpenMC Users Group
Hi Norbert,
If you want the total energy deposition, you should either 1) not use a particle filter or, 2) if you use a particle filter, make sure you list neutron, photon, electron, and positron. One of the changes resulting from #1462 is that the code is now able to differentiate between the energy deposited from photon collisions and electron/positron collisions. Thus, using a particle filter with only neutrons and photons won't actually give you all the energy deposited (most of the energy deposited on the photon side is really from electrons).