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@inproceedings{diazcruz:ipac2021-mopab289,
author = {J.A. Diaz Cruz and A.L. Edelen and D.R. Edstrom and B.T. Jacobson and A.H. Lumpkin and J.P. Sikora and R.M. Thurman-Keup},
% author = {J.A. Diaz Cruz and A.L. Edelen and D.R. Edstrom and B.T. Jacobson and A.H. Lumpkin and J.P. Sikora and others},
% author = {J.A. Diaz Cruz and others},
title = {{Machine Learning Training for HOM reduction and Emittance Preservation in a TESLA-type Cryomodule at FAST}},
booktitle = {Proc. IPAC'21},
pages = {916--919},
eid = {MOPAB289},
language = {english},
keywords = {HOM, cavity, emittance, electron, controls},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-MOPAB289},
url = {https://jacow.org/ipac2021/papers/mopab289.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-MOPAB289},
abstract = {{Low emittance electron beams are of high importance at facilities like the LCLS-II at SLAC. Emittance dilution effects due to off-axis beam transport for a TESLA-type cryomodule (CM) have been shown at the Fermilab Accelerator Science and Technology facility. The results showed the correlation between the electron beam-induced cavity high-order modes (HOMs) and submacropulse centroid slewing and oscillation downstream of the CM. Mitigation of emittance dilution can be achieved by reducing the HOM signals and the variances in the submacropulse beam positions downstream of the CM. Here we present a Machine Learning based optimization and model construction for HOM signal level reduction using Neural Networks and Gaussian Processes. To gather training data we performed experiments using single bunch and 50 bunch electron beams with charges up to 125 pC/b. We measured HOM signals of all cavities and beam position with a set of BPMs downstream of the CM. The beam trajectory was changed using V/H125 corrector set located upstream of the CM. The results presented here will inform the LCLS-II injector commissioning and will serve as a prototype for HOM reduction and emittance preservation.}},
}