Speaker
Description
A new Energy Compression System (ECS), consisting of four RF cavities, was installed in the SuperKEKB electron transfer line (BTe) during the 2025 summer shutdown. Optimising BTe performance using full multi-turn injection simulations is computationally demanding. To accelerate this process, we compare the beam tracked through BTe — including the ECS — to the dynamic aperture of the High-Energy Ring lattice obtained from Xsuite simulations. The SAD lattices were converted to Xsuite and benchmarked to ensure consistency between the two frameworks. This method provides a fast, first-order estimate of the expected injection efficiency by optimising the survival fraction through the evaluation of particle action amplitudes, while also accounting for physical apertures. Radiation effects and a tapering can be optionally included. Different injection schemes are supported within the same framework. Together, these elements enable rapid optimisation of the ECS parameters with significantly reduced computational cost.
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