Alignment tolerance studies for the cSTART storage ring

The KIT cSTART project (compact STorage ring for Accelerator Research and Technology) aims to demonstrate the injection and storage of a high intensity ultra-short electron bunch in a large acceptance storage ring using the FLUTE linac and a laser plasma accelerator (LPA) as injectors. Amongst the unique features of the cSTART project is the wide dynamic range of machine and beam parameters to be employed, i.e. bunch charge, bunch length, beam energy, etc. The comparably low energy beam (40-90 MeV) will be injected on-axis and will be stored for about 100 ms without reaching equilibrium due to the absence of significant radiation damping. In order to ensure stable operation of the storage ring, we need to specify tolerable magnetic lattice misalignments and understand the impact on the beam dynamics to be able to implement adequate correction schemes. In this paper, we report on first studies and simulation results on the effects of magnet misalignment, roll angles, and field errors on the dynamic aperture and momentum acceptance of the cSTART storage ring and propose a suitable correction strategy.