Speaker
Description
Fixed Field alternating gradient Accelerators (FFAs) are a promising technology for the proton driver of the next generation spallation neutron source, ISIS-II. The beam in an ISIS-II FFA will experience strong space-charge forces and studying their effects could be key to understanding the drivers of beam loss. The beam dynamics in an FFA are typically studied by integrating the equations of motion of a particle through a 3D field map. While accurate and reliable, this method is computationally expensive, and a custom space-charge solver is required to calculate the self-fields from the beam in the FFA. Currently, no publicly available FFA simulation program can model self-consistent space charge.
Instead, by decomposing the FFA field into its harmonic components, a differential algebra map that approximates the non-linear dynamics inherent in the FFA field can be calculated. By combining particle transport with the map and conventional space-charge tools, the beam dynamics in the FFA under the influence of strong space-charge can now be studied.