Speaker
Description
The TPS upgrade study, TPS-II, aims to achieve ultra-low emittance while maintaining operational stability and compatibility with existing beamlines. In one of the promising lattice candidates, the first-order momentum compaction factor (α₁) is reduced to 6.0 × 10⁻⁵, which is approximately four times smaller than that of the present TPS. In such low α optics, the longitudinal beam dynamics become increasingly sensitive to environmental perturbations and higher-order momentum compaction effects. This study presents a preliminary assessment of the operational risks associated with this low-α regime. We investigate the machine's sensitivity to circumference fluctuations driven by ground motion and thermal drifts, with the aim of estimating the required performance for the RF frequency feedback system. Furthermore, we examine the potential Robinson stability limits imposed by the reduced synchrotron frequency and high beam loading. These studies provide a first step toward defining the specifications for the required Low-Level RF (LLRF) system upgrade and optimizing the future lattice design.
| In which format do you inted to submit your paper? | LaTeX |
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