| Title |
Mitigation Strategies for the Instabilities Induced by the Fundamental Mode of the HL-LHC Crab Cavities |
| Authors |
- L. Giacomel, P. Baudrenghien, X. Buffat, R. Calaga, N. Mounet
CERN, Meyrin, Switzerland
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| Abstract |
The transverse impedance is one of the potentially limiting effects for the performance of the High-Luminosity Large Hadron Collider (HL-LHC). In the current LHC, the impedance is dominated by the resistive-wall contribution of the collimators at typical bunch-spectrum frequencies, and is of broad-band nature. Nevertheless, the fundamental mode of the crab cavities, that are a vital part of the HL-LHC baseline, adds a strong and narrow-band contribution. The resulting coupled-bunch instability, which contains a strong head-tail component, requires dedicated mitigation measures, since the efficiency of the transverse damper is limited against such instabilities, and Landau damping from octupoles would not be sufficient. The efficiency and implications of various mitigation strategies, based on RF feedbacks and optics changes, are discussed, along with first measurements using crab cavity prototypes at the Super Proton Synchrotron (SPS).
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| Paper |
download THBP40.PDF [0.341 MB / 4 pages] |
| Poster |
download THBP40_POSTER.PDF [0.461 MB] |
| Cite |
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※ EndNote |
| Conference |
HB2023 |
| Series |
ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams (68th) |
| Location |
Geneva, Switzerland |
| Date |
09-13 October 2023 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Volker R.W. Schaa (GSI, Darmstadt, Germany); Jan Chrin (PSI, Villigen, Switzerland); Massimo Giovannozzi (CERN, Geneva, Switzerland); Dong Eon Kim (PAL, Pohang, South Korea); Marten H. Koopmans (CERN, Geneva, Switzerland); Anton Lechner (CERN, Geneva, Switzerland); Philippe Schoofs (CERN, Geneva, Switzerland) |
| Online ISBN |
978-3-95450-253-0 |
| Online ISSN |
2673-5571 |
| Received |
30 September 2023 |
| Revised |
08 October 2023 |
| Accepted |
11 October 2023 |
| Issued |
19 October 2023 |
| DOI |
doi:10.18429/JACoW-HB2023-THBP40 |
| Pages |
571-574 |
| 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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