A NOVEL GANTRY FOR PROTON THERAPY AT THE PAUL SCHERRER INSTITUTE

PSI has gained in the last few years the unique experience of using a proton therapy system based on a beam scanning delivery technique and on a compact gantry. This knowledge is now bringing forth new initiatives. We are continuously producing significant modifications and improvements to the present system, gantry 1. The major new step is however the decision of PSI to purchase a dedicated accelerator for the medical project. In the context of the expansion of the medical project of PSI (project PROSCAN) we have also started to plan the realisation of a second proton gantry, gantry 2. In this lecture we present the main ideas for the novel gantry, which will be based on one hand on the experience with the present technology, but on the other hand should be designed as a system more open to further developments and needs. The established and the future requirements for the beam delivery on the new gantry were routed into the specification list for the dedicated accelerator.