Speaker
Description
Accelerator-based light sources play a crucial role as probes for cutting-edge scientific research. Nowadays, the transverse beam emittance in the diffraction-limited storage ring reaches several tens picometer to the diffraction limit, and the steady-state micro-bunching (SSMB) storage ring pursues ultra-short beam lengths with nanoscale beam lengths in the ring. These changes will exacerbate collective effects within the ring, of which intra-beam scattering (IBS) is one of the most important. In current research and practical applications, the iterative method is used to calculate the equilibrium emittance, which takes a long time and cannot be directly applied to the lattice optimization. This project will conduct a systematic study on the calculation and optimization of the IBS effect, focusing on revealing the differences and physical essence of the IBS effect calculation between the longitudinal bunch length changes sharply in the SSMB storage ring and that in the traditional storage ring. At the same time, through reasonable approximation, the exact expression for the direct and rapid calculation of the equilibrium emittance caused by the IBS effect is given. Based on this, a method for optimizing the IBS effect in the design of the storage ring is proposed. Taking the HMBA magnetic lattice structure as an example, a specific case with 10 percent of equilibrium emittance decrease by optimization is given to prove that this method has wide application.
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