Monte Carlo simulations for reconstruction of neutron time-resolving energy distribution in D-D fusion reactions

Abstract

There exist few methods for reconstruction of time-resolved energy distributions of particles which are emitted in intense bursts. One of them, which offers very good results, is the Monte Carlo method. This article describes the use of this method for the reconstruction of time-resolved energy distribution of neutrons which are emitted in D-D fusion reactions. This article shows the main idea and testing of the method. The energy spectra are reconstructed from time-resolved signals of neutrons, which are recorded using several detectors in one direction at different distances. The basic idea of the method and results of testing reflect that the method could give better results while including other detectors in opposite direction. Considering these facts, the method was extended with the transformation of the energy of neutrons, which are emitted in opposite direction. This transformation is based on scattering theory and specifically is applied for the D-D reaction (energy of emitting neutrons is around 2.45 MeV). This modified Monte Carlo method was implemented in the FORTRAN 95 language and was used in the processing of data from experiments in the PF 1000 facility working in the Institute of Plasma Physics and Laser Microfusion in Warsaw. Specifically, shot No. 5566 is presented.