NAPAC25 - North American Particle Accelerator Conference 2025

Online multi-objective Bayesian optimization of injection efficiency and beam lifetime with skew quadrupoles at NSLS-II

MOP066

11 Aug 2025, 16:00

2h

Ballroom A (SAFE Credit Union Convention Center)

Poster Presentation MC6 - Beam Instrumentation, Controls, AI/ML, and Operational Aspects Monday Poster Session

Speaker

Yoshiteru Hidaka (Brookhaven National Laboratory)

Description

At NSLS-II, the vertical emittance of electron beam is typically blown up to ~30 pm with a coupling wave to increase beam lifetime during user operation. As more and more insertion devices are added to the storage ring, injection efficiency to the ring drops noticeably in certain machine states, apparently due to degraded dynamic apertures. To help alleviate this issue, we have recently performed online multi-objective Bayesian optimization to increase injection efficiency while maintaining beam lifetime, by adjusting the strengths of 15 skew quadrupoles in non-dispersive sections. We report the results of this optimization effort.

Funding Agency

This work was supported by the U.S. Department of Energy, under DOE Contract No. DE-AC02-76SF00515 and the Office of Science, Office of Basic Energy Sciences.