University of Manchester

Gantry Design for Linac-boosted Protons

Trainee: Ewa Oponowicz
Supervisor: Hywel Owen

The program of work consists of examining the beam transport both through the booster linac and through candidate superconducting gantry designs. The overall objective of the project is to determine a detailed beam-optical design and outline magnet design for a combined superconducting gantry and booster linac system. Initial work has concentrated on the use of combined-function superconducting dipoles using a canted cosine-theta winding method as demonstrated separately at NIRS and LBNL. The Fellow will examine this option including an assessment of how scanning and focusing should be performed. In particular, it is likely that a downstream scanning option will be chosen but the relative merits of this compared to upstream scanning will be examined as part of the project. Alternative schemes such as the use of compact superconducting achromats will also be studied.

The Fellow works alongside existing postdoctoral and doctoral researchers who are developing the design and implementation of a high-gradient proton linac to be used within the overall design. It is hoped that a demonstration of a test structure will occur during the Fellowship, and the Fellow will also contribute to implementation and testing work as appropriate. The Fellow will spend some portion of their time at PSI and may assist them with the development of their facility as part of the overall training programme. In addition, there will be opportunities to contribute to the design and implementation of the research beam-line at the Christie Hospital, and to undertake other project work there that will contribute to the Fellow’s training.

The Fellow is employed as part of the Accelerator Group in the School of Physics and Manchester University, but based at the Cockcroft Institute at the Daresbury Science and Innovation Campus. The Fellow has joined this group and will perform the essential work of designing how to integrate the high-gradient structures into a complete treatment and imaging system. The issues to investigate are: capture losses in the first structures and how to mitigate these; dose delivery rates to the patient and how to carry out efficient imaging; coupling of the booster linac output to a suitable gantry design; beam control and switching between treatment to imaging energies; beam-optical design; magnet design; particle tracking and scanning.