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1.
New Understanding of Longitudinal Beam Instabilities and Comparison with Measurements / Karpov, Ivan (CERN)
Beam instabilities driven by broad- and narrowband impedance sources have been treated separately so far. In this contribution, we present the generalised beam stability analysis based on the concept of van Kampen modes. [...]
2024 - 8 p. - Published in : JACoW HB 2023 (2024) 45-52 Fulltext: PDF;
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.45-52
2.
Impact of Broadband Impedance on Longitudinal Coupled-Bunch Instability Threshold / Karpov, Ivan (CERN) ; Shaposhnikova, Elena (CERN)
Coupled-bunch instabilities (CBI) and the loss of Landau damping (LLD) in the longitudinal plane can affect the performance of high-current synchrotrons. The former is driven by the narrowband impedance of resonant structures, while the latter is mainly determined by the broadband impedance of the entire accelerator and is a single-bunch effect. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 2245-2248 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2245-2248
3.
Refining the LHC Longitudinal Impedance Model / Zampetakis, Michail (CERN) ; Argyropoulos, Theodoros (CERN) ; Brischetto, Ylenia (CERN) ; Calaga, Rama (CERN) ; Giacomel, Lorenzo (CERN) ; Karlsen-Bæck, Birk Emil (INFN, Rome ; Rome U. ; CERN) ; Karpov, Ivan (CERN) ; Mounet, Nicolas (CERN) ; Salvant, Benoit (CERN) ; Timko, Helga (CERN)
Modelling the longitudinal impedance for the Large Hadron Collider (LHC) has been a long-standing effort, especially in view of its High-Luminosity (HL) upgrade. The resulting impedance model is an essential input for beam dynamics studies. [...]
2024 - 4 p. - Published in : JACoW HB 2023 (2024) 559-562 Fulltext: PDF;
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.559-562
4.
Longitudinal Loss of Landau Damping in Double Harmonic RF Systems below Transition Energy / Intelisano, Leandro (CERN ; U. Rome La Sapienza (main)) ; Damerau, Heiko (CERN) ; Karpov, Ivan (CERN)
Landau damping plays a crucial role in ensuring single-bunch stability in hadron synchrotrons. In the longitudinal plane, loss of Landau damping (LLD) occurs when a coherent mode of oscillation moves out of the incoherent synchrotron frequency band. [...]
2024 - 4 p. - Published in : JACoW HB 2023 (2024) 575-578 Fulltext: PDF;
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.575-578
5.
Mechanism of Longitudinal Single-Bunch Instability in the CERN SPS / Karpov, Ivan (CERN) ; Gadioux, Maxime (University Coll., Dublin)
Understanding the origin of beam instabilities is essential for reaching the highest performance of proton synchrotrons. In the present work, the Oide-Yokoya eigenvalue method of solving the linearised Vlasov equation was used to shed light on the mechanism of longitudinal single-bunch instability in the CERN SPS. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 3161-3164 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3161-3164
6.
Generalized threshold of longitudinal multibunch instability in synchrotrons / Karpov, Ivan (CERN) ; Shaposhnikova, Elena (CERN)
Beam stability is an essential requirement for particle accelerators. Longitudinal coupled-bunch instabilities (CBI) are driven by beam interaction with long-range wakefields induced in the resonant structures with narrow-band impedance. [...]
arXiv:2309.06638.- 2024-07-01 - 14 p. - Published in : Phys. Rev. Accel. Beams 27 (2024) 074401 Fulltext: 2309.06638 - PDF; Publication - PDF;
7.
Fast high-intensity single-bunch transverse coherent instability in synchrotrons due to a broad-band resonator impedance / Métral, E
CERN-PS-2001-035-AE.- Geneva : CERN, 2001 - 11 p. Fulltext: PDF;
8.
Longitudinal coupled-bunch instability evaluation for FCC-hh / Karpov, Ivan (CERN) ; Shaposhnikova, Elena (CERN)
High-order modes (HOM) of the accelerating rf structures and other machine elements, if not sufficiently damped, can drive longitudinal coupled-bunch instabilities (CBI). Their thresholds can be accurately obtained from macro-particle simulations using the detailed impedance model containing many different contributions. [...]
CERN-ACC-2019-075.- 2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPGW083 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPGW083
9.
Threshold for Loss of Longitudinal Landau Damping in Double Harmonic RF Systems / Intelisano, Leandro (CERN ; U. Rome La Sapienza (main)) ; Damerau, Heiko (CERN) ; Karpov, Ivan (CERN)
Landau damping is a natural stabilization mechanism to mitigate coherent beam instabilities in the longitudinal phase space plane. In a single RF system, binominal particle distributions with a constant inductive impedance above transition (or capacitive below) would lead to a vanishing threshold for the loss of Landau damping (LLD), which can be avoided by introducing an upper cutoff frequency to the impedance. [...]
2022 - 5 p. - Published in : JACoW HB 2021 (2022) 95-99 Fulltext: PDF;
In : 64th ICFA Advanced Beam Dynamics Workshop on High Intensity and High Brightness Hadron Beams (HB 2021), Batavia, Illinois, United States, 4 - 9 Oct 2021, pp.95-99
10.
New Analytical Criteria for Loss of Landau Damping in Longitudinal Plane / Karpov, Ivan (CERN) ; Argyropoulos, Theodoros (CERN) ; Nese, Sigurd (U. Bergen (main)) ; Shaposhnikova, Elena (CERN)
Landau damping is a very important stabilization mechanism of beams in circular hadron accelerators. In the longitudinal plane, Landau damping is lost when the coherent mode is outside of the incoherent synchrotron frequency spread. [...]
2022 - 6 p. - Published in : JACoW HB 2021 (2022) 100-105 Fulltext: PDF;
In : 64th ICFA Advanced Beam Dynamics Workshop on High Intensity and High Brightness Hadron Beams (HB 2021), Batavia, Illinois, United States, 4 - 9 Oct 2021, pp.100-105

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