Abstract
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.
Highlights
The study for this magnet was tailored for the TULIP and the FASST machines designed by the TERA foundation [1,2] for cancer therapy
This compact fast trimmable iron cobalt (FeCo) prototype could be used for the feasibility studies of a new generation of compact medical gantries based on the work of Amaldi et al [3,4]
It can be appreciated that the FeCo prototype has an almost linear behavior even at ∼1.86 T
Summary
The study for this magnet was tailored for the TULIP (turning linac for protontherapy) and the FASST (fast adaptive spot scanning therapy) machines designed by the TERA foundation [1,2] for cancer therapy. This paper describes the requirements, electromagnetic design, construction and magnetic measurements of an iron cobalt (FeCo) dipole prototype magnet. This compact FeCo prototype could be used for the feasibility studies of a new generation of compact medical gantries based on the work of Amaldi et al [3,4]. These machines require compact magnets with a large field range and a fast response (up to 200 Hz of repetition range). It has been decided to use a FeCo alloy, which has the property of having a very high saturation threshold, for the yoke for two main reasons: reducing the weight and size of the magnet in order to simplify the rotating structure, and achieving a fast response
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