Robust Permanent Magnet Beam Delivery Systems for Medical Radiotherapy Linacs

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This proposal forms part of an initiative to design a linear electron accelerator for radiotherapy where all subsystems will be optimised to ensure it is robust, reliable, cost effective and appropriate for use in challenging environments including developing countries. This project aims to design a beam delivery system (magnetic focusing and steering) which uses modern capabilities in permanent magnets to ensure that a high-quality electron beam can be taken from the source to the x-ray generating target with minimal losses. Replacing some or all of the existing electromagnets with permanent magnets should enable a maintenance-free focusing system which requires very little electricity, which has been highlighted as a barrier to providing this technology in ODA countries. (A few smaller, cheaper and replaceable adjustable electromagnets will be included for fine tuning, which would have minimal power requirements.)