--------------------- When run in fully analogue mode, FLUKA allows the user to study fluctuations and correlations, and to set up a direct simulation of physical reality where all moments of phase space distributions are faithfully reproduced. On the other hand, in the many applications where only quantities averaged over many events are of interest, it is convenient to use calculation techniques converging to the correct expectation values but reducing the variance (or the CPU time, or both) by sampling from biased distributions. This is especially useful in deep penetration calculations, or when the results of interest are driven by rare physical interactions or cover a small domain of phase space. FLUKA makes available several biasing options. Some are easy to use, but others require experience and judgment, and often a few preliminary preparation runs are needed to optimise the biasing parameters.
Previous Index Next