Speaker
Description
Beam dynamics studies, and in particular detailed macroparticle simulations, are challenging for high-energy hadron synchrotrons due to the large number of circulating bunches. The High-Luminosity Large Hadron Collider (HL-LHC) will accelerate beams with about twice the initial LHC design intensity. It will also feature additional installations such as the crab cavities, which increase the total impedance of the accelerator. In the longitudinal plane, the baseline HL-LHC scenario will push the beam parameters close to the stability limit. It is therefore of interest to study the impact of the crab cavity higher-order-mode impedances, which could lead to coupled-bunch instabilities (CBI), on the beam stability. This is particularly important in the presence of a broad-band impedance, which was predicted to lower the CBI threshold. In this contribution, particle-tracking simulation setups for instabilities, driven by either broad- or narrow-band impedances, are investigated. This paves the way for CBI simulations that take into account both impedance sources, to study the longitudinal stability limits at injection.
Funding Agency
Research supported by the HL-LHC project
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