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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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(91)

Bead-Pull Method for transverse impedance measurements / Calzone, Eleonora ; Zannini, Carlo (CERN) ; Antuono, Chiara (Sapienza Universita e INFN, Roma I (IT)) ; Sito, Leonardo (Universita degli Studi di Napoli Federico II (IT))
Beam Coupling Impedance represents a serious issue in High-Energy particle accelerators [...]
CERN-STUDENTS-Note-2023-083. - 2023
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(72)

Beam-Coupling Impedance and Wake Field – Bench Measurements / Mostacci, A (U. Rome La Sapienza (main)) ; Caspers, F (CERN)
2016 - 9 p. - Published in : ICFA Beam Dyn. Newsl.: 69 (2016) , pp. 88-96 Fulltext: Newsletter69Mostacci - PDF; ICFA69_88-96 - PDF; External link: Fulltext

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(69)

RF measurements II / Wendt, Manfred (speaker) (CERN)
The measurement of radio-frequency (RF) signals and the characterization of RF components, systems and subsystems used in particle accelerators is based on particular measurement instruments, like the RF vector network analyzer (VNA) and the spectrum analyzer (SA), but also on general-purpose instruments, like the oscilloscope and others. Before going into some details of SAs and VNAs, the concept of travelling waves in transmission lines is explained, along with their characteristics and the definition of the complex reflection coefficient. [...]
2023 - 3059. 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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(69)

RF measurements I / Wendt, Manfred (speaker) (CERN)
"The measurement of radio-frequency (RF) signals and the characterization of RF components, systems and subsystems used in particle accelerators is based on particular measurement instruments, like the RF vector network analyzer (VNA) and the spectrum analyzer (SA), but also on general-purpose instruments, like the oscilloscope and others. Before going into some details of SAs and VNAs, the concept of travelling waves in transmission lines is explained, along with their characteristics and the definition of the complex reflection coefficient [...]
2023 - 2954. 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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(59)

Numerical Calibration of the Bead-Pull Setup for Beam Coupling Impedance Evaluation / El Dali, Dalia Mahmoud Fouda (CERN) ; De Michele, Giovanni (ADAM, Geneva) ; Fanella, Stefano (ADAM, Geneva) ; Métral, Elias (CERN) ; Zannini, Carlo (CERN)
The bead-pull method is a commonly used electromagnetic field measurement technique exploited to tune a radiofrequency cavity to achieve design specifications. The frequency of a resonant cavity is perturbed by inserting a metallic or dielectric bead. [...]
2022 - 3 p. - Published in : JACoW IPAC 2022 (2022) 607-609 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.607-609

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(56)

Numerical calibration of the bead-pull measurement setup for beam coupling impedance evaluation / El Dali, Dalia
To identify the accelerator structures that are contributing to performance limitations and execute mitigation techniques, a precise estimate of the beam coupling impedance is required [...]
CERN-THESIS-2022-189 -

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(56)

Metamaterial-Based Absorbers for the Reduction of Accelerator Beam-Coupling Impedance / Masullo, Maria Rosaria (INFN, Naples) ; Vaccaro, Vittorio Giorgio (INFN, Naples) ; Losito, Roberto (CERN) ; Masi, Alessandro (CERN) ; Passarelli, Andrea (Naples U.) ; Chikhi, Nassim (Naples U.) ; Papari, Gianpaolo (Naples U.) ; Andreone, Antonello (Naples U.)
Resistive-wall impedance constitutes a significant percentage of the total beam-coupling impedance budget of an accelerator. A number of different reduction techniques have been proposed during the years depending on the specific applications, ranging from higher order modes damping to solutions entailing high electrical-conductivity coatings of the pipe. [...]
2019 - 7 p. - Published in : IEEE Trans. Microw. Theory Tech. 68 (2019) 1340-1346

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(52)

Impact of beam-coupling impedance on the Schottky spectrum of bunched beam / Lannoy, C (CERN ; LPHE, Lausanne) ; Lasocha, K (CERN) ; Pieloni, T (LPHE, Lausanne) ; Alves, D (CERN) ; Mounet, N (CERN)
The Schottky monitors of the Large Hadron Collider (LHC) canbe used for non-invasive beam diagnostics to estimate various bunchcharacteristics, such as tune, chromaticity, bunch profile orsynchrotron frequency distribution. However, collective effects, inparticular beam-coupling impedance, can significantly affectSchottky spectra when large bunch charges are involved. [...]
2024 - 21 p. - Published in : JINST 19 (2024) P03017 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.P03017

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(51)

Bead-Pull Measurement Method and Tuning of a Prototype CLIC Crab Cavity / Wegner, Rolf (CERN) ; Wuensch, Walter (CERN) ; Burt, Graeme (Lancaster U.) ; Woolley, Benjamin (Lancaster U.)
A bead-pull method has been developed which measures in a single bead passage the amplitude and phase advance of deflecting mode travelling wave structures. This bead-pull method has been applied to measure and tune a Lancaster University-designed prototype crab cavity for CLIC. [...]
CERN-ACC-2014-404.- 2014 - 3 p. - Published in : (2014) , pp. MOPP035 Published version from JACoW: PDF; External link: JACoW
In : 27th Linear Accelerator Conference, Geneva, Switzerland, 31 Aug - 5 Sep 2014, pp.MOPP035

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