Upgrade of the accelerator driven Frascati Neutron Generator: alpha/neutron correlation measurements for the installation of a trigger system

This PhD dissertation is devoted to the upgrade of the Frascati Neutron Generator (FNG). The research and development activity carried out at the FNG facility is composed of two parts: i) The production of a code to make available for the FLUKA-INFN (name only FLUKA for the rest of the thesis) software a source routine able to simulate accurately the whole FNG spectrum (both neutrons and alpha/3He); ii) A simulation activity devoted to study the feasibility of the new upgrades for FNG. In particular, I performed a feasibility study for the installation of a trigger system at FNG to make time and space correlated measurements between particles and neutrons generated by the DT fusion reactions. To this aim, it is of extreme importance to study the time and spatial correlation between them. First, I wrote a code that reproduce the FNG’s neutron spectrum starting from the MCNP software for FLUKA. Then, I extended the code to allow it to reproduce the whole fusion reaction spectrum. Second, I set up a series of dedicated Monte Carlo simulations using the FLUKA code to validate the new source routine. After, I used it to study the alpha/n spatial correlation.