Plans for a Linear Paul Trap at Rutherford Appleton Laboratory
6th International Particle Accelerator Conference, IPAC 2015 (2015) 2590-2593
Abstract:
For over a decade, Linear Paul Traps (LPT) have been used in the study of accelerator beam dynamics. LPT studies exploit the similarity of the Hamiltonian with that of a beam in a quadrupole channel while having advantages in the flexibility of parameter choice, compactness and low cost. In collaboration with Hiroshima University, LPT research planned at STFC Rutherford Appleton Laboratory (RAL) in the UK aims to investigate a range of topics including resonance crossing, halo formation, long-term stability studies and space charge effects. Initially, a conventional quadrupole-based LPT will be built at RAL and used for a variety of experiments. In parallel, a design for a more advanced LPT that incorporates higher order multipoles will be pursued and later constructed. This multipole trap will allow non-linear lattice elements to be simulated and so broaden considerably the range of experiments that can be conducted. These will include the investigation of resonance crossing in non-linear lattices, a more detailed study of halo formation and the effect of detuning with amplitude. In this paper we report on progress made in the project to date and future plans.Progress on simulation of fixed field alternating gradient accelerators
6th International Particle Accelerator Conference, IPAC 2015 (2015) 495-498
Abstract:
Fixed Field Alternating Gradient accelerators have been realised in recent decades thanks partly to computational power, enabling detailed design and simulation prior to construction. We review the specific challenges of these machines and the range of different codes used to model them including ZGOUBI, OPAL, SCODE and a number of inhouse codes from different institutes. The current status of benchmarking between codes is presented and compared to the results of recent characterisation experiments with a 150 MeV FFAG at KURRI in Japan. Finally, we outline plans toward ever more realistic simulations including space charge, material interactions and more detailed models of various components.Experimental study of integer resonance crossing in a nonscaling fixed field alternating gradient accelerator with a Paul ion trap
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS 18:3 (2015) ARTN 034001
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
Abstract:
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.Experimental studies of resonance crossing in linear non-scaling ffags with the S-POD plasma trap
IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference (2013) 2675-2677