MCNPX BENCHMARK TESTS OF NEUTRON PRODUCTION IN MASSIVE LEAD TARGET

Experiments on simplified ADS (Accelerator Driven System) setups are done at the Joint Institute for Nuclear Research Dubna. Relativistic protons are directed at heavy targets, and transmutation is studied in the neutron field produced. Experimental values are used to test program codes. In this study, "The Phasotron Experiment" and the MCNPX 2.4.0 simulations of the experimental setup are presented, the influence of the various parts of the setup on calculations is discussed, and the efficiency of parallel computing for simulations of similar experiments is studied. The experiment is quantitatively well described by MCNPX simulations, even when using a simplified description of the experimental setup. A cluster of computers in our laboratory showed that the speed of our calculations almost linearly increases with the sum of processor power. Many of our other experiments are well described by simulations, promising that MCNPX could well describe larger, and more complex ADS systems.