| Title |
Coupled Bunch Mode Zero Correction within the Orbit Feedback Bandwidth |
| Authors |
- P.S. Kallakuri, A.R. Brill, J. Carwardine, L. Emery, N. Sereno
ANL, Lemont, Illinois, USA
|
| Abstract |
The fast orbit feedback (FOFB) bandwidth for Advanced photon source upgrade (APS-U) will be DC-1 kHz and the synchrotron frequency will be between 100-560 Hz. This frequency overlap places coupled bunch mode 0 (CBM0) induced horizontal orbit motion inside the orbit feedback bandwidth, potentially affecting our ability to achieve beam stability goals. Longitudinal feedback kicker is not strong enough to damp CBM0 oscillations. We developed new beam-based feedback method to suppress CBM0 oscillations with low level RF phase as actuator. It uses existent FOFB framework with no changes to the feedback algorithm. Effectiveness of this method is verified using present APS operations lattice where synchrotron frequency is outside orbit feedback bandwidth*. In the present work, low alpha lattice is created to emulate APS-U setting where synchrotron frequency is inside the orbit feedback bandwidth. Experiments with this lattice successfully demonstrated CBM0 correction within FOFB bandwidth. Combined operation of orbit feedback and CBM0 correction is stable, and CBM0 oscillations are damped. We achieved better orbit motion suppression and corrector drive efforts are reduced as well.
|
| Footnotes & References |
* P. Kallakuri et al., ’Coupled bunch mode zero correction using orbit measurements and RF system phase feedback’, doi:10.1103/PhysRevAccelBeams.25.082801 |
| Funding |
Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. |
| Paper |
download MO2C03.PDF [1.027 MB / 4 pages] |
| Slides |
download MO2C03_TALK.PDF [1.326 MB] |
| Cite |
download ※ BibTeX
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※ EndNote |
| 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 |
14 July 2023 |
| Revised |
07 September 2023 |
| Accepted |
13 September 2023 |
| Issue Date |
25 September 2023 |
| DOI |
doi:10.18429/JACoW-IBIC2023-MO2C03 |
| Pages |
7-10 |
| Copyright |
 Published 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. |
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