The special multigroup transport structure used by FLUKA for low-energy neutrons calls for some biasing options specific to these particles. We have just introduced the weight window command WW-PROFIle. Two more options are LOW-BIAS, which has already been mentioned before in the context of energy cutoffs, but which is used also to set a user-defined non-analogue absorption probability, and LOW-DOWN, by which it is possible to bias neutron thermalisation (downscattering). The latter, however, is an option recommended only to users with a good knowledge and experience of neutronics.
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