Simulation of the Betatron Magnetic Field at the Electron Beam Displacement in Comsol Multiphysics

Abstract

This article describes the betatron magnetic field simulation in Comsol Multiphysics software package. The model makes it possible to evaluate the betatron focusing properties at the moment of electron displacement onto the target. The simulation results coincide with the experiment described earlier. The study shows the vertical size of the target affects the focal spot size. However, a target size decrease leads to low output dose, since not all electrons reach it. Therefore, the vertical size of the target should be greater than or equal to the vertical dimension of the accelerated beam. * Corresponding author: aak65@tpu.ru

Simulation analysis and experiment of magnetic pole shape influence on betatron magnetic field

“…Elec trons move un der the MF at an air gap be tween an up per MP (UMP) and a lower MP (LMP). The core of the mag net struc ture is the MP, and the UMP and LMP face shapes di rectly de ter mine the MF dis tri bu tion (MFD) [18][19][20]. The main pa ram e ters of the MP model are as fol lows: the di am e ter, the height, the dis tance be tween the UMP and LMP, and the di am e ter of the cen tral mag netic pad, and they are 170 mm, 97 mm, 32 mm, and 70 mm, re spec tively.…”