Speaker
Description
The Super Tau Charm Facility (STCF) is a high-luminosity electron–positron collider operating in a center of mass energy of 2-7 GeV. Its stringent requirements for beam brightness and stability pose significant challenges to the design of the transport system of the injector, especially the positron transport lines of the damping ring. According to the previous work, there is an enormous emittance growth in the position beam, which may influence the beam quality in the main linac and further decrease the beam brightness in the e+/e- colliders. The emittance growth is primarily caused by the residual dispersion and coherent synchrotron radiation effect. In this study, we applied a Bayesian-optimization algorithm to adjust multiple sets of quadrupole strengths (K-values) along the transport line. We thereby established a functional relationship between the K-values and the resulting beam emittance, and used this relationship to identify the optimal configuration. The results indicate that the optimized design not only meets the injection requirements of the damping ring, but also effectively controls emittance growth and preserves beam quality, providing a feasible reference for the optical design and error analysis of subsequent complex transport line systems.
Funding Agency
Work is supported by the National Key R&D Program of China under Contract No. 2022YFA1602202 and the National Natural Science Foundation of China (No.12341501 and 12175224)
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