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https://doi.org/10.18429/JACoW-IBIC2023-MOP041
Title Modified Fast Orbit Feedback Controller for Disturbance Attenuation in Long Straights for Diamond-II
Authors
  • S. Banerjee, M.G. Abbott, L. Bobb, I. Kempfpresenter
    DLS, Harwell, United Kingdom
  • I. Kempfpresenter
    University of Oxford, Oxford, United Kingdom
Abstract At Diamond Light Source, the fast orbit feedback (FOFB) uses one array of correctors and the controller is designed using the internal model control (IMC) structure. The Diamond-II upgrade will introduce an additional array of fast correctors and a new controller that is designed using the generalised modal decomposition, increasing the overall closed-loop bandwidth from 140 Hz to 1 kHz. Although simulation results have shown that the resulting beam displacement is within specification in all straights, they have also shown that the performance on long straights is limited, particularly in the vertical plane. In this paper, the controller is tuned in order to increase the FOFB performance in long straights by introducing a mode-by-mode regularisation parameter. The performance of the controller beyond 1 kHz is assessed using new disturbance data and a new measurement noise model, showing that the Diamond-II performance criteria are met, even in the presence of measurement noise.
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Conference IBIC2023
Series International Beam Instrumentation Conference (12th)
Location Saskatoon, Canada
Date 10-14 September 2023
Publisher JACoW Publishing, Geneva, Switzerland
Editorial Board Volker R.W. Schaa (GSI, Darmstadt, Germany); Tonia Batten (CLS, Saskatoon, Canada); Michael Bree (CLS, Saskatoon, Canada); Christine Petit-Jean-Genaz (CERN, Geneva, Switzerland); Darren Hunter (CLS, Saskatoon, Canada)
Online ISBN 978-3-95450-236-3
Online ISSN 2673-5350
Received 07 September 2023
Revised 09 September 2023
Accepted 13 September 2023
Issue Date 16 September 2023
DOI doi:10.18429/JACoW-IBIC2023-MOP041
Pages 119-122
Copyright
Creative Commons CC logoPublished by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.