Development of a compact and fast trimmable FeCo magnet for medical gantries

In the frame of the Tulip project, an application for accelerator technology to radiation therapy, supported by a CERN Knowledge Technology Fund, the design, manufacture and test of a compact, fast trimmable iron cobalt (FeCo) accelerator dipole magnet prototype has been performed and completed at CERN. The aim of this project is to illustrate the benefits of a FeCo magnet for medical gantries in which weight and size are critical. The prototype is a 250 mm long dipole providing a central field of up to 1.8 T, the field can be trimmed in the percent range at frequencies of up to 200 Hz. The experimental results clearly demonstrate that FeCo magnets can be interesting alternatives for medical gantries because of their linear behavior up to high fields and their compact nature.