| Article | |
| Title | Mitigation strategies for the instabilities induced by the fundamental mode of the HL-LHC Crab Cavities |
| Author(s) | Giacomel, L (CERN) ; Baudrenghien, P (CERN) ; Calaga, R (CERN) ; Buffat, X (CERN) ; Mounet, N (CERN) |
| Publication | 2024 |
| Number of pages | 14 |
| In: | JINST 19 (2024) P05046 |
| In: | 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.P05046 |
| DOI | 10.1088/1748-0221/19/05/P05046 |
| Subject category | Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN LHC |
| Project | CERN HL-LHC |
| Abstract | The transverse impedance is one of the potentially limitingeffects for the performance of the High-Luminosity Large HadronCollider (HL-LHC). In the current LHC, the impedance is dominatedby the resistive-wall contribution of the collimators at typicalbunch-spectrum frequencies, and is of broad-bandnature. Nevertheless, the fundamental mode of the crab cavities,that are a vital part of the HL-LHC baseline, adds a strong andnarrow-band contribution. The resulting coupled-bunch instability,which contains a strong head-tail component, requires dedicatedmitigation measures, since the efficiency of the transverse damperis limited against such instabilities, and Landau damping fromoctupoles would not be sufficient. The efficiency and implicationsof various mitigation strategies, based on RF feedbacks and opticschanges, are discussed, along with first measurements using crabcavity prototypes at the Super Proton Synchrotron (SPS). |
| Copyright/License | publication: © 2024 The Author(s) (License: CC-BY-4.0) |
Corresponding record in: Inspire
Record created 2024-06-07, last modified 2024-07-05
