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Description
BESSY III is a planned fourth-generation synchrotron light source designed to deliver diffraction-limited, extremely brilliant soft X-rays, with the goal of becoming a key instrument for discoveries in materials and energy research. During the current design phase, extensive simulation studies are being performed to evaluate and improve the robustness and reliability of the candidate storage-ring lattice.
The robustness analyses allow a direct comparison of the expected lattice performance with that of other fourth-generation facilities under realistic error conditions. Building on this, the simulated commissioning process aims to recover optimal machine performance by mitigating the impact of imperfections, using measurements from beam position monitors (BPMs) together with corrections applied mostly via steerer magnets. This work quantifies the achievable performance of the machine by simulating the full commissioning sequence, including beam-transmission optimization, sextupole ramp-up, RF-cavity correction, beam-based alignment (BBA), orbit correction, and LOCO-based optics correction. After the lattice has been corrected, the injection efficiency for off-axis beams is evaluated.
The results provide essential feedback for defining the commissioning strategy and enhancing the overall resilience of the BESSY III lattice design, forming a key contribution to the upcoming conceptual design report (CDR).
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