The completed photon interaction physics were included in update 2.1.24, and Toni will post a description of the physics models later on. Here are a few simple examples on how photon transport simulations can be run...
The source name in the "src" card must be followed by "g", to indicate that the source is for photons. For example, a point source of 1.0 MeV photons:
The calculation also requires photon ACE libraries and a corresponding directory file. This data is not provided with the Serpent 1 installation package, but any photon library used with MCNP should do. The syntax is the same as for neutron data libraries:
To create the Serpent directory file from an MCNP xsdir file, use the latest version of the xsdirconvert.pl script
. The calculation also requires a few additional data files for the physics model, which are available for download at:
The data path is defined in the input with "set pdatadir", for example:
Note that the path is the complete path to the directory where the data files in the zip file are located.
Since photon interaction data is elemental, also the material definitions look a bit different. Here's an example for air:
Code: Select all
mat air -1.20500E-03
For a complete simple example, see one of the demo cases presented at the recent fusion neutronics workshop at Cambridge:
http://montecarlo.vtt.fi/mtg/Fusion_201 ... ma/simple2