Bayesian optimization for ion beam centroid correction.

An activity of the TRIUMF automatic beam tuning program, the Bayesian optimization for Ion Steering (BOIS) method has been developed to perform corrective centroid steering of beams at the TRIUMF ISAC facility. BOIS exclusively controls the steerers for centroid correction after the transverse optics have been set according to theory. The method is fully online, easy to deploy, and has been tested in low energy and post-accelerated beams at ISAC, achieving results comparable to human operators. scaleBOIS and boundBOIS are naïve proof-of-concept solutions to preferably select beam paths with minimal steering. Repeatable and robust automated steering reduces reliance on operator expertise and operational overhead, ensuring reliable beam delivery to the experiments and thereby supporting TRIUMF's scientific mission.