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Description
Injection efficiency into the Diamond Light Source Storage Ring (SR) is currently optimised by operators performing a grid scan over the final pair of corrector magnets inside the Booster-to-Storage Ring (BTS) transfer line. The phase advance between the pair is sufficient to provide good control over the position and angle of the beam as it enters the SR. However, the method is slow and the strengths of the corrector pair can approach power supply limits over time as machine conditions drift. We propose a Bayesian optimisation algorithm to optimise leading right-singular vector coefficients obtained from a Singular Value Decomposition (SVD) of the BTS response matrix over all corrector magnets, improving sample efficiency. We further transform the proposed coefficients through a non-linear map to restrict the set of solutions to a desirable range as determined by the user. We compare our results to the grid scan technique and suggest further refinements to the algorithm.
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