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@InProceedings{kallakuri:napac2019-weplm11,
author = {P.S. Kallakuri and A.R. Brill and J. Carwardine and N. Sereno},
title = {{Closed Loop Modeling of the APS-U Orbit Feedback System}},
booktitle = {Proc. NAPAC'19},
pages = {683--686},
paper = {WEPLM11},
language = {english},
keywords = {controls, feedback, power-supply, vacuum, simulation},
venue = {Lansing, MI, USA},
series = {North American Particle Accelerator Conference},
number = {4},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2019},
issn = {2673-7000},
isbn = {978-3-95450-223-3},
doi = {10.18429/JACoW-NAPAC2019-WEPLM11},
url = {http://jacow.org/napac2019/papers/weplm11.pdf},
note = {https://doi.org/10.18429/JACoW-NAPAC2019-WEPLM11},
abstract = {Orbit stabilization to 10% of the expected small beam sizes for Advanced Photon Source Upgrade (APS-U) requires pushing the state of the art in fast orbit feedback (FOFB) control, both in the spatial domain and in dynamical performance. We are building a Matlab/Simulink fast orbit feedback system model to guide decisions about APS-U fast orbit feedback system implementation and to provide a test bench for optimal-control methodologies and orbit correction algorithms applicable to the APS-U. A transfer function model was built from open-loop frequency-response and step-response measurements of the present APS and subsequently validated against closed-loop measurements. A corresponding model for APS-U fast orbit feedback was generated by substituting measured responses of APS-U prototype corrector magnets and power supplies into this same model. Stabilizing PID gains are designed using model, and simulated dynamic performance of the new controller is validated through experiments.},
}