details on the tmp entry in material card

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nuttin
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Joined: Fri Jul 22, 2011 11:24 am
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Location: Grenoble, France

details on the tmp entry in material card

Post by nuttin » Wed May 31, 2017 3:25 pm

hello
as an old user of MCNP, i'm used to set the temperature of each moderating cell
by MCNP's TMP card (for the thermal motion of target nuclei)
i'm wondering how this temperature can be set in Serpent
my favorite hypothesis is that this is done implicitely by each material
(based on the nuclear temperature, w/ or w/o tmp entry)
but i'm not sure at all, could you please confirm or correct ?
many thanks by advance

PS : i would have a second question on the tft entry, for which i cannot find
any practical information
--
Alexis Nuttin
+33 (0)4 76 28 41 90
LPSC Reactor Physics Group
Grenoble Institute of Technology

Ville Valtavirta
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Re: details on the tmp entry in material card

Post by Ville Valtavirta » Wed May 31, 2017 4:25 pm

Hi,

the temperatures (and densities) in Serpent are typically material based rather than cell based as in MCNP. If the material is to be at an elevated temperature with respect to the linked nuclear data libraries, the temperature of the material can be set by the tmp-entry in the material card. The tmp-entry will invoke the built-in Doppler preprocessor to process the nuclear data to the requested temperature for that material.

The other possibilities for setting the temperatures is to

1) either use the tms-entry in the material card (similar to the tmp-entry), which will use on-the-fly temperature treatment using the TMS temperature treatment technique rather than the pre-processor. This will be slower, but will conserve memory in cases with many different material temperatures.
2) or use the multi-physics interface to bring in complex temperature (and/or density) distributions. With the multi-physics interface, Serpent can typically infer the minimum and maximum temperatures of different materials from the interface files, but they can also be set using the tft-entry as described in the usage instructions.

Hope this helps,
Ville

nuttin
Posts: 3
Joined: Fri Jul 22, 2011 11:24 am
Security question 2: 0
Location: Grenoble, France

Re: details on the tmp entry in material card

Post by nuttin » Wed May 31, 2017 4:56 pm

OK, thanks !
--
Alexis Nuttin
+33 (0)4 76 28 41 90
LPSC Reactor Physics Group
Grenoble Institute of Technology

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