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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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(91)

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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(75)

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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(68)

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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(66)

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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(62)

Comparison of Stretched-wire, Bead-pull and Numerical Impedance Calculations on 3.9 GHz Dipole Cavities / Goudket, P (Daresbury) ; Beard, C D (Daresbury) ; Burt, G (Lancaster U.) ; Dexter, A C (Lancaster U.) ; Jones, Roger M (Cockcroft Inst. Accel. Sci. Tech.) ; McIntosh, P A (Daresbury)
2008 - 3 p. External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPP128

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(45)

A New Kicker for the TLS Longitudinal Feedback System / Lau, Wai-Keung ; Chang Lung Hai ; Dehler, Micha ; Hsu, Kuo-Tung ; Hsu, San-Yuang ; Jung Chou Ping ; Wei Chen, Cheng ; Yang Chen Huan ; Yang Tze Te
A new longitudinal kicker that is modified from the Swiss Light Source (SLS) design to fit into the TLS storage ring. It will be served as the actuator in the longitudinal multi-bunch feedback control loop. [...]
2005 External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.949

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(45)

RF Bead Pull Measurements of the DQW / Jaume, Guillaume (CERN)
This report was written within the framework of the CERN Summer Student Program. [...]
CERN-STUDENTS-Note-2015-044. - 2015
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(45)

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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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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