MONTE-CARLO CALCULATIONS OF THE BEHAVIOR OF 300 KEV ELECTRONS FROM ACCELERATORS

A Monte Carlo method for the passage of electrons based on a single sc attering model has been developed. A code constructed is operable on p ersonal computers, and has been applied to analyze electron behavior i n a layered system consisting of Ti (an accelerator window), air, CTA and backing material irradiated by 300 keV electrons, in the static an d dynamic irradiation. The energy spectra and the angular distribution s of electrons at the CTA surface as well as depth distributions of en ergy deposition in the CTA layer of 114 mu m thickness placed on vario us backing materials have been obtained. The backscattering coefficien ts for various backing materials have been calculated. These results i ndicate that the characteristics of the electrons at the forward surfa ce of CTA in the dynamic irradiation are similar to those of the elect rons diffusely incident on the backing material. Some of these results are in good agreement with our experiments.