Speaker
Description
The National Synchrotron Light Source II (NSLS-II) storage ring requires a high-current (400 A), high-voltage (1 kV) dipole power supply system to maintain stable beam operations. Despite the high reliability of the primary system, a 2022 failure event resulted in over 20 hours of beam downtime, highlighting the necessity for enhanced operational resilience. This paper presents the design and implementation of an in-house designed auxiliary dipole power supply system developed to mitigate such risks. The auxiliary system utilizes a modular architecture with N+2 redundancy and high-frequency switched-mode power converters with active power factor correction. This design eliminates large 60 Hz transformers, reducing the system footprint to 10% of the original installation while enabling hot-swappable servicing. A transfer switch ensures a rapid transition from primary to backup systems in under 20 minutes. To maintain stringent orbit stability, the system incorporates a custom DC EMI filter and a series-pass linear amplifier, achieving a measured current stability of 1.71 ppm (DC to 10 kHz). These results demonstrate the system's effectiveness in reducing recovery time and enhancing the overall reliability of NSLS-II beam operations.
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