Speaker
Description
In 2019, the NSLS-II fast orbit feedback (FOFB) system was upgraded by reducing BPM and Cell Controller latency, increasing the closed-loop bandwidth from about 250 Hz to 400 Hz. The dynamic behavior of the power supply, magnet, and vacuum chamber, however, had not been directly measured and was treated as a lumped delay. To provide baseline parameters for the NSLS-IIU upgrade, we developed a dedicated test bench and remeasured these components. The existing fast-corrector power supplies show bandwidths of about 4.5 kHz horizontally and 1.5 kHz vertically, while the magnet and chamber responses are near 10–15 kHz with an overall response time of about 10 µs. We also characterized a newer power-supply regulator design and tuned it to achieve a 6 kHz bandwidth in both planes for use in the upgraded FOFB system. Incorporating these measurements into a physics-based model yields good agreement with observed system behavior. These results provide the first full experimental characterization of the fast-corrector chain at NSLS-II and establish the baseline for designing next-generation hardware for NSLS-IIU.
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