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Beam coupling impedance of the main extraction kickers in the CERN PS
/ Neroni, M (CERN ; U. Rome La Sapienza (main)) ; Barnes, M J (CERN) ; Lasheen, A (CERN) ; Mostacci, A (U. Rome La Sapienza (main)) ; Popovic, B (Argonne) ; Vollinger, C (CERN)
In view of the High Luminosity (HL) upgrade of the LHC, thebeam intensity must be doubled in the injector chain. To performreliable beam dynamics simulations, the beam coupling impedance inthe injectors, such as the Proton Synchrotron (PS), must be followedclosely by including all contributing elements into the impedancemodel. [...]
2024 - 12 p.
- Published in : JINST 19 (2024) T08001
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.T08001
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Beam Coupling Impedance of the Main Extraction Kickers in the CERN PS
/ Neroni, Michela (CERN ; U. Rome La Sapienza (main)) ; Barnes, Michael (CERN) ; Lasheen, Alexandre (CERN) ; Mostacci, Andrea (U. Rome La Sapienza (main)) ; Popovic, Branko (Argonne) ; Vollinger, Christine (CERN)
In view of the High Luminosity (HL) upgrade of the LHC, the beam intensity must be doubled in the injector chain. To perform reliable beam dynamics simulations, the beam coupling impedance in the injectors, such as the Proton Synchrotron (PS), must be followed closely by including all contributing elements into the impedance model. [...]
2024 - 5 p.
- Published in : JACoW HB 2023 (2024) 178-182
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.178-182
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Characterization of the longitudinal beam coupling impedance and mitigation strategy for the fast extraction kicker KFA79 in the CERN PS
/ Neroni, M (CERN ; U. Rome La Sapienza (main)) ; Barnes, M (CERN) ; Ducimetiere, L (CERN) ; Lasheen, A (CERN) ; Mostacci, A (U. Rome La Sapienza (main)) ; Popovic, B (Argonne) ; Trubacova, P (CERN) ; Vollinger, C (CERN)
In the framework of the High Luminosity Upgrade of the LHC (HL-LHC) the beam intensity from the injectors must be doubled while keeping longitudinal beam parameters unchanged. As such, high-quality beams with high intensities are required also from the Proton Synchrotron (PS). [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) WEPL150
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPL150
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Longitudinal Microwave Instability Study at Transition Crossing with Ion Beams in the CERN PS
/ Lasheen, Alexandre (CERN) ; Damerau, Heiko (CERN) ; Huschauer, Alexander (CERN) ; Popovic, Branko (CERN)
The luminosity of lead ion collisions in the Large Hadron Collider (LHC) was significantly increased during the 2018 ion run by reducing the bunch spacing from 100 ns to 75 ns, allowing to increase the total number of bunches. With the new 75 ns variant, three instead of four bunches are generated each cycle in the Low Energy Ion Ring (LEIR) and the Proton Synchrotron (PS) with up to 30% larger intensity per bunch. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 3197-3200
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3197-3200
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Identification of impedance sources responsible for longitudinal beam instabilities in the CERN PS
/ Lasheen, A (CERN) ; Damerau, H (CERN) ; Favia, G (CERN) ; Kozlowski, P (CERN) ; Popovic, B (CERN)
Longitudinal instabilities in the CERN PS are an important limitation to obtain the expected beam intensity and longitudinal emittance at the PS extraction in the framework of the LHC Injector Upgrade (LIU) project. The observed coupled-bunch instabilities lead to dipolar and quadrupolar oscillations, as well as to an uncontrolled longitudinal emittance blow-up for proton beams. [...]
2020 - 7 p.
- Published in : 10.23732/CYRCP-2020-009.323
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.323-329 (CERN-2020-009)
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Impedance localization and identification
/ Biancacci, N (CERN) ; Fernández, R Alemany (CERN) ; Alexahin, Y (Fermilab) ; Carlà, M (CERN) ; Eldred, J (Fermilab) ; Höfle, W (CERN) ; Huschauer, A (CERN) ; Levens, T (CERN) ; Malina, L (CERN) ; Métral, E (CERN) et al.
The beam coupling impedance represents one of the sources of potential beam instabilities in particle accelerators. The localization of large coupling impedance sources is therefore very important in order to focus the efforts for mitigation measures when these are needed. [...]
2020 - 7 p.
- Published in : 10.23732/CYRCP-2020-009.141
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.141 (CERN-2020-009)
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9.
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Building the impedance model of a real machine
/ Salvant, Benoit (CERN) ; Amorim, David (CERN ; Grenoble, INP) ; Antipov, Sergey (CERN) ; Arsenyev, Sergey (CERN) ; Beck, Mario (CERN) ; Biancacci, Nicolo (CERN) ; Brüning, Oliver (CERN) ; Campelo, Jose Enrique (CERN) ; Carideo, Emanuela (CERN) ; Caspers, Fritz (CERN) et al.
A reliable impedance model of a particle accelerator can be built by combining the beam coupling impedances of all the components. This is a necessary step to be able to evaluate the machine performance limitations, identify the main contributors in case an impedance reduction is required, and study the interaction with other mechanisms such as optics nonlinearities, transverse damper, noise, space charge, electron cloud, beam-beam (in a collider). [...]
CERN-ACC-2019-098.-
2019 - 6 p.
- Published in : 10.18429/JACoW-IPAC2019-WEYPLS1
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEYPLS1
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10.
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Needs and Solutions for Machine Impedance Reduction
/ Vollinger, C (CERN) ; Farricker, A (CERN) ; Kaltenbacher, T R (CERN) ; Kramer, P (CERN) ; Popovic, B K (CERN)
Particle beams with highest possible beam intensities are requested nowadays, hence in modern circular accelerators, the consideration of beam coupling impedance issues is of increasing relevance. Classical sources of beam coupling impedance are RF-systems, injection and extraction kickers, but also beam diagnostic elements such as wire scanners where the object itself forms an undesired cavity, and beam pipe transitions, namely tapers or steps. [...]
2018 - 7 p.
- Published in : CERN Yellow Rep. Conf. Proc. 1 (2018) 125-131
Fulltext: PDF;
In : ICFA Mini-Workshop on Impedances and Beam Instabilities in particle accelerators, Benevento, Italy, 18 - 22 Sep 2017, pp.125-131 (CERN-2018-003-CP)
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