Cancer is a major global health issue. With the development of accelerator physics, boron neutron capture therapy based on accelerator neutron sources has received widespread attention. In the accelerator system, the low energy beam transport is responsible for connecting the ion source and accelerator, as well as processing the beam. For the problem of beam deflection, the chopper is required, so a high-performance chopper is crucial for the entire system.

This study aims to improve the electric field uniformity of the chopper by using circular arc plates instead of parallel plates, and to simulate the chopper design through Python program coupling using CST Studio Suite and TraceWin software.

The beam deflection formula of the chopper was theoretically derived, and the electrostatic and beam dynamics design was completed using CST Studio Suite and TraceWin software. The advantages and feasibility of the circular arc plate were verified through coupling simulation of the two software.

Theoretical calculations and simulations show that the electric field distribution of circular arc plates is more uniform, and the beam deflection function is efficiently completed, confirming the feasibility of the design scheme.

By coupling CST Studio Suite with TraceWin software for simulation, a more realistic simulation of beam dynamics can be achieved, which addresses the issue that TraceWin software is incapable of setting the electric field strength of circular arc plates. The coupled simulation method of CST Studio Suite and TraceWin has been developed, which has certain value for research on chopper design.