New Features in the Design of the IBA-SHI Proton Therapy Facility

The proton therapy facility developed by IBA and SHI has already been described in many papers. The present paper presents the status of the magnet and of the extraction system. In the magnet, the main changes compared to the previous design are an increase in energy from 230 MeV to 235 MeV and the study of an alternative extraction scheme featuring a small gap opening instead of the completely closed gap. Detailed extraction calculations using a combination of analytical and tracking approaches have been carried out and are presented here.