Dynamic external source simulation mode

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The dynamic simulation mode allows running external source simulations in sub- and super-critical systems over extended time periods, while keeping the simulated population size within reasonable limits. The methodology is based on sequential population control, as described in a conference paper presented at M&C 2013.[1]

The mode is invoked by linking a time bin structure in the set nps card. The simulation is divided in time intervals, as defined by the bin structure. The size of the simulated population is adjusted at each bin boundary to match the starting population, and the total population weight is preserved.

Example inputs for the fast system


  1. ^ Leppänen, J. "Development of a dynamic simulation mode in the Serpent 2 Monte Carlo code." In proc. M&C 2013, Sun Valley, ID, May 5-9, 2013.