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RIS citation export for MOVIR11: Applying Machine Learning to Stabilize the Source Size in the ALS Storage Ring

AU  - Leemann, S.C.
AU  - Byrne, W.E.
AU  - Cuneo, D.P.
AU  - Ehrlichman, M.P.
AU  - Hellert, T.
AU  - Hexemer, A.
AU  - Lu, Y.
AU  - Marcus, M.
AU  - Melton, C.N.
AU  - Nishimura, H.
AU  - Penn, G.
AU  - Sannibale, F.
AU  - Shapiro, D.A.
AU  - Sun, C.
AU  - Ushizima, D.
AU  - Venturini, M.
AU  - Wallén, E.J.
ED  - Schaa, Volker RW
TI  - Applying Machine Learning to Stabilize the Source Size in the ALS Storage Ring
J2  - Proc. of IPAC2020, Caen, France, 10-15 May 2020
CY  - Caen, France
T2  - International Particle Accelerator Conference
T3  - 11
LA  - english
AB  - In state-of-the-art synchrotron light sources the overall source stability is presently limited by the achievable level of electron beam size stability. This source size stability is presently on the few-percent level, which is still 1–2 orders of magnitude larger than already demonstrated stability of source position/angle (slow/fast orbit feedbacks) and current (top-off injection). Until now source size stabilization has been achieved through corrections based on a combination of static predetermined physics models and lengthy calibration measurements (feed-forward tables), periodically repeated to counteract drift in the accelerator and instrumentation. We now demonstrate for the first time* how application of machine learning allows for a physics- and model-independent stabilization of source size relying only on previously existing instrumentation in ALS. Such feed-forward correction based on neural networks that can be continuously online-retrained achieves source size stability as low as 0.2 microns rms (0.4%) which results in overall source stability approaching the sub-percent noise floor of the most sensitive experiments.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
ER  -