Magnet design optimization of a 100 MeV separated sector medical cyclotron and its injection line

TL;DR

This paper details the magnetic design and optimization of a 100 MeV medical cyclotron and its injection line, ensuring precise magnetic fields and efficient beam transfer from a 14 MeV cyclotron.

Contribution

It introduces a novel magnetic field design with correction coils and optimized injection line for improved beam transport in a 100 MeV medical cyclotron.

Findings

Isochronous magnetic field achieved with correction trim coils

Focusing forces maintain particles near the median plane

Optimized injection system minimizes beam loss

Abstract

This paper presents the magnetic design of a 100MeV Separated Sector Medical Cyclotron (SSMC) as well as the optimization of the injection line magnets where will be used to transport the 14MeV proton beam from the Azimuthally Varying Field (AVF) cyclotron to the SSMC. The study demonstrates that the isochronous magnetic field with a tolerance around 10-4 T can be obtained all along prescribed path by placing three sets of correction trim coils in the pole tips. The result of Betatron oscillations is sufficient to verify that the focusing forces of the magnetic field can hold particles close to the median plane of the magnet. In order to inject the beam by minimum loss from a 14MeV Cyclotron to SSMC, it is essential for the beam to fit into the acceptance ellipse of the separate sector cyclotron. The characteristics of the beam injection system is calculated and optimized by Trace-3D beam dynamic code.