Numerical model of proton beam transport through electric scanner

Abstract

In this work, using the numerical simulation method, the vertical and horizontal displacement of the proton beam is analyzed, by changing the voltage of the plan parallel electrodes of the electric scanner. The initial proton beam was modeled by centered Gaussian distribution. The electrostatic field of the scanner was obtained using the finite element method. The dependence of the beam center trensverse shift, as well as the beam losses at the output of the scanner, on the applied electrode voltage, has been determined. Comparison between proton trajectories calculated using analytical/numerical electric field has been performed. Based on this, the effective length of the scanner electrodes was determined. The results of this paper are applied in a technical solution that provides homogeneous fluence distribution in sample irradiation by 3 - 30 keV proton beams, obtained from a light ion source