Speaker
Description
Fixed Field alternating gradient Accelerators (FFAs) are an attractive option for delivering high intensity hardon beams at future spallation neutron sources. Designing a high-intensity facility requires careful modelling of space-charge driven beam loss; not only at injection but later in the acceleration cycle if techniques such as beam stacking are employed.
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. 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.