Publications by Suzie Sheehy

Study of resonance crossing in non-scaling FFAGS using the S-POD linear Paul trap

IPAC 2014: Proceedings of the 5th International Particle Accelerator Conference (2014) 1571-1573

DJ Kelliher, S Machida, CR Prior, SL Sheehy, K Fukushima, K Ito, K Moriya, H Okamoto, T Okano

Copyright © 2014 CC-BY-3.0 and by the respective authors. Experiments on EMMA have shown that with rapid acceleration a linear non-scaling FFAG can accelerate through several integer tunes without detrimental effects on the beam [1]. Proton and ion applications such as hadron therapy will necessarily have a slower acceleration rate, so their feasibility depends on how harmful resonance crossing is in this regime. A simple and useful tool to answer such fundamental questions is the Simulator of Particle Orbit Dynamics (S-POD) linear Paul trap (LPT) at Hiroshima University, which can be set up to simulate the dynamics of a beam in an FFAG. We report here results of experiments to explore different resonance crossing speeds, quantify beam loss and study nonlinear effects. We also discuss the implications of these experimental results in terms of limits on acceptable acceleration rates and alignment errors.

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