CERN Accelerating science

Accelerator Physics

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2022-11-23
06:24
Chromaticity Measurement Using Beam Transfer Function in High Energy Synchrotrons / Buffat, Xavier (CERN) ; Furuseth, Sondre (CERN) ; Vicentini, Giulio (CERN)
Control of chromaticity is often critical to mitigate collective instabilities in high energy synchrotrons, yet classical measurement methods are of limited use during high intensity operation. We explore the possibility to extract this information from beam transfer function measurements, with the development of a theoretical background that includes the impact of wakefields and by analysis of multi-particle tracking simulations. [...]
2022 - 6 p. - Published in : JACoW HB 2021 (2022) 46-51 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.46-51

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2022-11-23
06:24
Understanding of the CERN-SPS Horizontal Instability with Multiple Bunches / Zannini, Carlo (CERN) ; Bartosik, Hannes (CERN) ; Carlà, Michele (CERN ; CELLS - ALBA, LLS) ; Carver, Lee (ESRF, Grenoble ; CERN) ; Li, Kevin (CERN) ; Métral, Elias (CERN) ; Rumolo, Giovanni (CERN) ; Salvant, Benoit (CERN) ; Schenk, Michael (CERN)
At the end of 2018, an instability with multiple bunches has been consistently observed during high intensity studies at the CERN-SPS. This instability could be a significant limitation to achieve the bunch intensity expected after the LHC Injector Upgrade (LIU). [...]
2022 - 6 p. - Published in : JACoW HB 2021 (2022) 77-82 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.77-82

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2022-11-23
06:24
Space Charge Resonance Analysis at the Integer Tune for the CERN PS / Schmidt, Frank (CERN) ; Asvesta, Foteini (CERN)
In the context of the LHC Injectors Upgrade (LIU) project, a series of studies have been performed in order to better understand the beam brightness limitations imposed by resonances and space charge effects. Space charge simulations using the adaptive space charge solver as implemented in the MAD-X code conducted for the CERN Proton Synchrotron (PS) show that a particle approaching the integer tune of Qx = 6 demonstrates a resonant behavior. [...]
2022 - 5 p. - Published in : JACoW HB 2021 (2022) 124-128 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.124-128

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2022-11-23
06:24
3D Symplectic Space Charge Implementation in the Latest Mad-X Version / Schmidt, Frank (CERN) ; Alexahin, Yuri (Fermilab) ; Latina, Andrea (CERN) ; Renshall, Harry (CERN)
In 2018 as part of a collaboration between CERN and FNAL, the space charge (SC) implementation has been upgraded in a test version of MAD-X. The goal has been to implement the 3D symplectic SC kick together with a number of new features and benchmark it with earlier MADX-SC versions. [...]
FERMILAB-CONF-22-383-V.- 2022 - 6 p. - Published in : JACoW HB 2021 (2022) 129-134 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.129-134

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2022-11-23
06:24
End-to-End Longitudinal Simulations in the CERN PS / Lasheen, Alexandre (CERN) ; Damerau, Heiko (CERN) ; Iliakis, Konstantinos (CERN)
In the context of the LHC Injector Upgrade (LIU) project, the main longitudinal limitations in the CERN PS are coupled bunch instabilities and uncontrolled emittance blow-up leading to losses at injection into the downstream accelerator, the SPS. To complement beam measurements, particle tracking simulations are an important tool to study these limitations. [...]
2022 - 6 p. - Published in : JACoW HB 2021 (2022) 106-111 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.106-111

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2022-11-23
06:24
HL-LHC Beam Dynamics with Hollow Electron Lenses / Hermes, Pascal (CERN) ; Bruce, Roderik (CERN) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Mereghetti, Alessio (CERN) ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN) ; Stancari, Giulio (Fermilab)
Each of the two proton beams in the High-Luminosity Large Hadron Collider (HL-LHC) will carry a total energy of 700 MJ. One concern for machine protection is the energy stored in the transverse beam halo, estimated to potentially reach up to 5% of the total stored energy. [...]
FERMILAB-CONF-22-369-AD.- 2022 - 6 p. - Published in : JACoW HB 2021 (2022) 59-64 Fulltext: jt - PDF; document - PDF; External link: Fermilab Library Server
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.59-64

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2022-11-23
06:24
Influence of Transverse Motion on Longitudinal Space Charge in the CERN PS / Laut, Alexander (CERN) ; Lasheen, Alexandre (CERN)
Particles in an intense bunch experience longitudinal self-fields due to space charge. This effect, conveniently described by geometric factors dependent on a particle’s transverse position, beam size, and beam pipe aperture, is usually incorporated into longitudinal particle tracking on a per-turn basis. [...]
2022 - 6 p. - Published in : JACoW HB 2021 (2022) 83-88 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.83-88

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2022-11-23
06:24
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

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2022-11-23
06:24
Closed Form Formulas of the Indirect Space Charge Wake Function for Axisymmetric Structures / Mounet, Nicolas (CERN) ; Dadiani, Ekaterine (CERN ; Carnegie Mellon U. (main) ; Tbilisi State U.) ; Métral, Elias (CERN) ; Rahemtulla, Adam (Ecole Polytechnique, Lausanne ; ETH, Zurich (main)) ; Zannini, Carlo (CERN)
Indirect space charge contributes significantly to the impedance of non-ultrarelativistic machines such as the LEIR, PSB and PS at CERN. While general expressions exist in frequency domain for the beam coupling impedance, the time domain wake function is typically obtained numerically, thanks to an inverse Fourier transform. [...]
2022 - 6 p. - Published in : JACoW HB 2021 (2022) 65-70 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.65-70

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2022-11-17
04:09
Design of beam optics and radiation protection concept for the NA60+ heavy-ion experiment at CERN / Gerbershagen, A. (CERN ; Groningen, KVI) ; Ahdida, C. (CERN) ; Bernhard, J. (CERN) ; Clerc, V. (CERN) ; Girod, S. (CERN) ; Scomparin, E. (Turin U. ; INFN, Turin) ; Usai, G. (Cagliari U. ; INFN, Cagliari) ; Vincke, H. (CERN)
NA60+ is a fixed target experiment proposed in the framework of the Physics Beyond Colliders programme at CERN. [...]
arXiv:2210.17527.
- 21 p.
Fulltext

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