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A Novel Method for Transverse Beam-Coupling Impedance Measurements in Particle Accelerator Devices Using the Bead-Pull Method
/ Antuono, Chiara (U. Rome La Sapienza (main) ; CERN) ; Sito, Leonardo (CERN ; Naples U.) ; Calzone, Eleonora (U. Rome La Sapienza (main) ; CERN) ; el Dali, D (CERN) ; Migliorati, Mauro (CERN ; U. Rome La Sapienza (main)) ; Mostacci, Andrea (CERN ; U. Rome La Sapienza (main)) ; Fienga, Francesco (CERN ; Naples U.) ; Marrazzo, Vincenzo Romano (CERN ; Naples U.) ; Breglio, Giovanni (CERN ; Naples U.) ; Rumolo, G (CERN) et al.
In high-energy particle accelerators, circulating particle beams with high intensity interact electromagnetically with their surroundings (i.e., metallic vacuum chambers of various geometries). These electromagnetic interactions, which are typically described through the concept of beam-coupling impedance, can represent a serious issue in terms of stability of the particle beam and heating on the accelerator structures. [...]
2024 - 9 p.
- Published in : IEEE Trans. Instrum. Meas. 73 (2024) 8005209
Fulltext: PDF;
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2.
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Recent updates in the impedance characterization of the CERN PS Booster Finemet RF system
/ Neroni, Michela (CERN ; Rome U.) ; Albright, Simon (CERN) ; Damerau, Heiko (CERN) ; Gnemmi, Giulia (CERN) ; Haase, Matthias (CERN) ; Mostacci, Andrea (Rome U.) ; Paoluzzi, Mauro (CERN) ; Vollinger, Christine (CERN)
During the last long shutdown of the accelerators at CERN (LS2), the main radio frequency system of the Proton Synchrotron Booster (PSB) was upgraded. A widebandsystem with Finemet magnetic alloy cavities driven by solid-state amplifiers replaced several different ferrite-loaded cavities. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) THPC52
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.THPC52
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3.
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Real time crystal collimation monitoring at the CERN Large Hadron Collider
/ Ricci, Gianmarco (Rome U. ; CERN) ; Mostacci, Andrea (Rome U. ; CERN) ; Mirarchi, Daniele (CERN) ; Matheson, Eloise (CERN) ; D'Andrea, Marco (CERN ; INFN, Legnaro) ; Di Castro, Mario (CERN) ; Cai, Rongrong (CERN) ; Redaelli, Stefano (CERN)
At the CERN Large Hadron Collider (LHC), bent crystals play a crucial role in efficiently redirecting ion-beam halo particles toward secondary collimators used for absorption. This innovative method leverages millimeter-sized crystals to achieve deflection equivalent to a magnetic field of hundreds of Tesla at LHC’s highest energies. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) TUPS42
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.TUPS42
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4.
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Machine learning based crystal collimator alignment optimization
/ Ricci, Gianmarco (CERN) ; D'Andrea, Marco (CERN) ; Di Castro, Mario (CERN) ; Matheson, Eloise (CERN) ; Mirarchi, Daniele (CERN) ; Mostacci, Andrea (CERN) ; Redaelli, Stefano (CERN)
In the CERN Large Hadron Collider (LHC), bent crystals are used to efficiently deflect beam halo particles toward secondary collimators used as absorbers. In this crystal collimation scheme, a crystal with a length of a few millimeters can produce a deflection equivalent to a magnetic field of hundreds of Tesla at LHC top energies, improving the cleaning performance of the machine. [...]
2024 - 8 p.
- Published in : Phys. Rev. Accel. Beams 27 (2024) 093001
Fulltext: PDF;
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5.
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A Wireless Method for Beam Coupling Impedance Measurements of the LHC Goniometer
/ Antuono, Chiara (CERN ; U. Rome La Sapienza (main)) ; Migliorati, Mauro (U. Rome La Sapienza (main)) ; Mostacci, Andrea (U. Rome La Sapienza (main)) ; Zannini, Carlo (CERN)
The beam coupling impedance (BCI) of an accelerator component should be ideally evaluated exciting the device with the beam itself. However, this scenario is not always attainable and alternative methods must be exploited, such as the bench measurements techniques. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 407-410
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.407-410
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6.
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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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7.
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RF Beam Diagnostics I
/ Mostacci, Andrea (speaker) (Sapienza University of Rome e INFN-Roma I (IT))
The lecture reviews general concepts of diagnostics for beam intensity diagnostics, beam transverse position and bunch length as well as beam arrival. Such concepts are discussed with some examples. [...]
2023 - 3162.
CERN Accelerator School; CAS course on "RF for Accelerators", 18 June - 01 July 2023, Berlin Germany
External links: Talk details; Event details
In : CAS course on "RF for Accelerators", 18 June - 01 July 2023, Berlin Germany
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8.
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Impedances and wakefields
/ Mostacci, Andrea (speaker) (Sapienza University of Rome e INFN-Roma I (IT))
The lecture reviews general concepts of beam-induced electromagnetic fields in accelerator devices. The concept of momentum kick is introduced and thus wake function and wake potential. [...]
2023 - 3130.
CERN Accelerator School; CAS course on "RF for Accelerators", 18 June - 01 July 2023, Berlin Germany
External links: Talk details; Event details
In : CAS course on "RF for Accelerators", 18 June - 01 July 2023, Berlin Germany
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9.
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A Wireless Method to Obtain the Impedance From Scattering Parameters
/ Antuono, Chiara (CERN) ; Migliorati, Mauro (Frascati) ; Mostacci, Andrea (Frascati) ; Métral, Elias (CERN) ; Zannini, Carlo (CERN)
The coaxial wire method is a common and appreciated choice to assess the beam coupling impedance of an accelerator element from scattering parameters. Nevertheless, the results obtained from wire measurements could be inaccurate due to the presence of the stretched conductive wire that artificially creates the conditions for the propagation of a Transverse ElectroMagnetic (TEM) mode. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 2213-2216
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2213-2216
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10.
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Status of the CompactLight Design Study
/ D'Auria, Gerardo (Sincrotrone Trieste) ; Aicheler, Markus (Helsinki Inst. of Phys.) ; Aksoy, Avni (Ankara U.) ; Alesini, David (Frascati) ; Apsimon, Robert (Cockcroft Inst. Accel. Sci. Tech.) ; Arnesano, Jordan Matias (Rome U.) ; Bellaveglia, Marco (Frascati) ; Bernhard, Axel (KIT, Karlsruhe) ; Bosco, Fabio (Rome U.) ; Buonomo, Bruno (Frascati) et al.
CompactLight (XLS) is an International Collaboration of 24 partners and 5 third parties, funded by the European Union through the Horizon 2020 Research and Innovation Programme. The main goal of the project, which started in January 2018 with a duration of 36 months, is the design of an hard X-ray FEL facility beyond today’s state of the art, using the latest concepts for bright electron photo-injectors, high-gradient accelerating structures, and innovative short-period undulators. [...]
2019 - 4 p.
- Published in : 10.18429/JACoW-FEL2019-THP078
Fulltext: PDF;
In : 39th International Free Electron Laser Conference, Hamburg, Germany, 26 - 30 Aug 2019, pp.THP078
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