CERN Accelerating science

Accelerator Physics

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2025-08-09
06:55
Metamaterials for impedance optimisation and sustainability / Zannini, Carlo (CERN) ; Sito, Leonardo (CERN)
Metamaterials could allow developing superconductive-like materials at ambient temperature, with consequent drastic reduction in energy consumption. They are therefore promising materials for future accelerators of small and big scale. [...]
2024 - 6 p. - Published in : JACoW IPAC 2024 (2024) TUXN1 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.TUXN1

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2025-08-09
06:55
Investigations in turn-by-turn optics measurements at KARA / Zimmermann, Frank (CERN) ; Keintzel, Jacqueline (CERN) ; Mueller, Anke-Susanne (KIT, Karlsruhe) ; Haerer, Bastian (KIT, Karlsruhe) ; Blomley, Edmund (KIT, Karlsruhe) ; Huttel, Erhard (KIT, Karlsruhe) ; Steinmann, Johannes (KIT, Karlsruhe) ; Gethmann, Julian (KIT, Karlsruhe) ; Tomas, Rogelio (CERN)
The Karlsruhe Research Accelerator (KARA) is a synchrotron light source user and test facility, operating at an electron beam energy ranging from 0.5 to 2.5 GeV. Performing optics measurements and comparing with the machine model promises an improved understanding of the lattice and the underlying beam dynamics. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) TUPG33 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.TUPG33

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2025-08-09
06:54
Development of reliable VHEE/FLASH passive dosimetry methods and procedures at CLEAR / Rieker, Vilde (CERN ; Oslo U.) ; Farabolini, Wilfrid (CERN) ; Corsini, Roberto (CERN) ; Wroe, Laurence (CERN) ; Bateman, Joseph (CERN ; Oxford U.) ; Korysko, Pierre (Oxford U. ; CERN) ; Robertson, Cameron (CERN ; Oxford U.)
The electron beam at CERN Linear Accelerator for Research (CLEAR) has been intensively used to study the potential use of Very High Energy Electrons (VHEE) for radiotherapy, including the so-called FLASH regime. An important part of these studies revolves around the development of reliable dosimetry methods, given that generally accepted standards are partly lacking for electron beams in the 100 MeV range and even more so in the ultra-high dose rates (UHDR) conditions needed for FLASH. [...]
2023 - Published in : JACoW IPAC 2023 (2023) THPM059 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPM059

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2025-08-09
06:54
Experimental confirmation of the impedance reduction campaign in the CERN SPS / Argyropoulos, Theodoros (CERN) ; Damerau, Heiko (CERN) ; Karpov, Ivan (CERN) ; Lasheen, Alexandre (CERN) ; Papotti, Giulia (CERN)
Measurements of the very long single bunch spectrum with RF off, were started in the SPS in 2012 to identify the main impedance sources responsible for both single and multi-bunch beam instabilities observed during operation. The impedance of the vacuum flanges with a strong peak at 1.4 GHz was identified and proven from simulations to limit the beam intensities required for the High-Luminosity LHC (HL-LHC). [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) TUODA2 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.TUODA2

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2025-08-09
06:54
Comparison between self-consistent and non self-consistent space charge analysis for the evolution of the coherent direct space charge modes / Métral, Elias (CERN) ; Amorim, David (CERN) ; Buffat, Xavier (CERN)
The question of the mitigation of the Transverse Mode Coupling Instability (TMCI) by space charge has been discussed for more than two decades. Since few years, it has become clear that the ABS model, which has been often used in the past and which assumes an air-bag bunch in a square well, is not sufficient to properly describe the complexity of the interaction between impedance and space charge. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) MOPS35 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPS35

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2025-08-09
06:54
Intrabunch motion in the presence of mode coupling / Métral, Elias (CERN)
The intrabunch motion for independent longitudinal or transverse beam oscillation modes has been explained analytically for impedance driven bunched-beam coherent instabilities already several decades ago by Laclare and they have been observed in many measurements and simulations. These oscillation patterns do not depend on the bunch intensity, they are head/tail symmetric and they exhibit a number of nodes equal to the radial mode number. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) MOPS36 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPS36

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2025-08-09
06:54
Operational improvements and upgrades of the CLEAR user facility / Korysko, Pierre (Oxford U.) ; Malyzhenkov, Alexander (CERN) ; Gilardi, Antonio (CERN) ; Aksoy, Avni (CERN) ; Robertson, C (Oxford U.) ; Granados, Eduardo (CERN) ; Najmudin, I (Oxford U.) ; Wroe, Laurence (CERN) ; Martinez-Calderon, Miguel (CERN) ; Corsini, Roberto (CERN) et al.
The CERN Linear Accelerator for Research (CLEAR) at CERN is a user facility providing a 200 MeV electron beam for accelerator R&D; and irradiation studies, including medical applications. In this paper we will outline the most recent improvements in CLEAR operation and beam control and delivery, and describe the upgrades under way, giving an update of their current status. [...]
2024 - 4 p. - Published in : JACoW LINAC 2024 (2024) THPB017 Fulltext: PDF;
In : 32nd Linear Accelerator Conference (LINAC 2024), Chicago, Illinois, United States, 25 - 30 Aug 2024, pp.THPB017

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2025-08-09
06:54
Generation of symmetrical optical caustic beams for precise alignment / Dusek, Martin (CERN ; Liberec Tech. U.) ; Gayde, Jean-Christophe (CERN) ; Sulc, Miroslav (Prague, Inst. Plasma Phys.)
Generating layers of symmetrical optical caustic beams using a specific configuration of cylindrical lenses is an innovative idea with potential application in precision alignment and other fields. The technique allows the generation of layers of non-diffracting beams with opposite accelerating directions. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) THPG35 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.THPG35

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2025-08-08
06:12
Optical diagnostic studies to analyse electron cyclotron resonance plasma produced in the GTS-LHC ion source / Bhaskar, Bichu (CERN) ; Küchler, Detlef (CERN) ; Kövener, Toke (Rome U.)
The GTS-LHC electron cyclotron resonance (ECR) ion source is an integral part of the chain of accelerators at CERN. It produces the heavy ion beams which are accelerated using a series of accelerators from LINAC up to the LHC. [...]
2024 - 4 p. - Published in : JACoW ECRIS 2024 (2024) TUP10 Fulltext: PDF;
In : 26rd International Workshop on ECR Ion Sources (ECRIS2024), Darmstadt, Germany, 15 - 19 Sep 2024, pp.TUP10

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2025-08-01
06:02
Testing aspects of the CERN beam interlock system prior to installation in the accelerator / Colinet, Antoine (CERN) ; Martin, Christophe (CERN) ; Romera, Iván (CERN) ; Uythoven, Jan (CERN) ; Secondo, Raffaello (CERN) ; Bolton, Samuel (CERN) ; Guasch-Martinez, Josep (CERN)
The Beam Interlock System (BIS) is the backbone of the machine protection system throughout the accelerator complex at CERN, from LINAC4 to the LHC. After 15 years of flawless operation, a new version of the BIS is currently being produced and will be installed in the LHC, SPS and North Area during CERN’s Long Shutdown 3, planned to start in 2026. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) THPG59 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.THPG59

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