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A wireless method for beam coupling impedance bench measurement of resonant structures
/ Antuono, Chiara (CERN ; U. Rome La Sapienza (main)) ; Mostacci, Andrea (U. Rome La Sapienza (main)) ; Passarelli, Andrea (INFN, Naples) ; Zannini, Carlo (CERN) ; Masullo, Maria Rosaria (INFN, Naples) ; Migliorati, Mauro (U. Rome La Sapienza (main))
The Beam Coupling Impedance (BCI) is a crucial aspect in the realm of accelerator physics, as it describes the electromagnetic interactions between charged particle beams and the accelerator structure. The measurement and quantification of BCI is an essential requirement to assess and mitigate its impact, particularly when introducing new components or addressing problems within existing devices. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) THPC53
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.THPC53
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Interim report for the International Muon Collider Collaboration
/ Accettura, Carlotta
The International Muon Collider Collaboration (IMCC) [1] was established in 2020 following the recommendations of the European Strategy for Particle Physics (ESPP) and the implementation of the European Strategy for Particle Physics-Accelerator R&D Roadmap by the Laboratory Directors Group [2], [...]
arXiv:2407.12450 ; CERN-2024-002
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Geneva : CERN, 2024-09-30 - 150.
(CERN Yellow Reports: Monographs ; 2/2024)
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e-book
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5.
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Laser-induced periodic surface structuring for secondary electron yield reduction of copper: dependence on ambient gas and wavelength
/ Nivas, Jijil JJ (INFN, Naples ; Naples U. ; U. Naples (main) ; CNR-SPIN, Naples) ; Hu, Meilin (U. Naples (main)) ; Valadan, Mohammadhassan (INFN, Naples ; Naples U.) ; Salvatore, Marcella (U. Naples (main) ; Naples U.) ; Fittipaldi, Rosalba (INFN, Naples ; Naples U. ; U. Salerno (main)) ; Himmerlich, Marcel (CERN) ; Bez, Elena (CERN ; Leipzig U.) ; Rimoldi, Martino (CERN) ; Passarelli, Andrea (INFN, Naples ; Naples U.) ; Oscurato, Stefano L (U. Naples (main)) et al.
One of the main limitations for future high-performance accelerators operating with positively charged particles is the formation of an electron-cloud inside the beam vacuum chamber, giving rise to instabilities. The Secondary Electron Yield (SEY) of the beam-facing surfaces gives a measure of the mechanism which drives this phenomenon. [...]
2023 - 11 p.
- Published in : Appl. Surf. Sci. 622 (2023) 156908
Fulltext: PDF;
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6.
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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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7.
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Sub-THz Waveguide Spectroscopy of Coating Materials for Particle Accelerators
/ Passarelli, Andrea (Naples U. ; INFN, Naples) ; Koral, Can (INFN, Naples) ; Masullo, Maria Rosaria (INFN, Naples) ; Vollenberg, Wilhelmus (CERN) ; Amador, Lucia Lain (CERN) ; Andreone, Antonello (INFN, Naples ; Naples U.)
The electromagnetic characterisation of different materials for the inner wall coating of beam pipes is a long-standing problem in accelerator physics, regardless the purpose they are used for, since their presence may affect in an unpredictable way the beam coupling impedance and therefore the machine performance. Moreover, in particle accelerators and storage rings of new generation very short bunches might be required, extending far in frequency the exploration of the beam spectrum and rendering therefore more and more important to assess the coating material response up to hundreds of GHz. [...]
2020 - 10 p.
- Published in : Condens. Mat. 5 (2020) 9
Fulltext: PDF;
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iPipe: An Innovative Fiber Optic Monitoring System for Beam Induced Heating on Accelerator Pipes
/ Fienga, Francesco (INFN, Naples) ; Ball, Austin (CERN) ; Beni, Noemi (CERN) ; Breglio, Giovanni (Naples U.) ; Buontempo, Salvatore (INFN, Naples ; CERN) ; Irace, Andrea (Naples U.) ; Masullo, Maria Rosaria (INFN, Naples) ; Salvant, Benoit (CERN) ; Szillasi, Zoltan (Debrecen, Inst. Nucl. Res.) ; Vaccaro, Vittorio (Naples U.) et al.
The iPipe project consists in the instrumentation, with Fiber Bragg Grating sensors (FBGs), of the beam pipe of the CMS experiment, which is part of the LHC. Being spectrally encoded, the FBGs are not sensitive to electromagnetic interference and broadband-radiation-induced losses. [...]
CERN-ACC-2018-088.-
2018 - 3 p.
- Published in : 10.18429/JACoW-IPAC2018-WEPAL011
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPAL011
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Space charge impedance and electromagnetic fields in elliptical vacuum chambers
/ Migliorati, Mauro (U. Rome La Sapienza (main) ; INFN, Rome) ; Biancacci, Nicolo (CERN) ; Masullo, Maria Rosaria (INFN, Naples) ; Palumbo, Luigi (U. Rome La Sapienza (main) ; INFN, Rome) ; Vaccaro, Vittorio (INFN, Naples ; Naples U.)
Starting from the electric fields produced by a point charge and a dipole travelling inside a circular vacuum chamber, in this paper we derive a formalism for a complete set of equations that describe the electromagnetic fields and the longitudinal and transverse coupling impedance arising by the interactions of a beam with a perfectly conducting pipe in the case of elliptic geometry. The expressions, which are valid for any frequency and beam energy, are written in terms of expansion of Mathieu functions, allow to range from a circular geometry to the parallel plates, and show an interesting parallelism with the well known expressions for a circular pipe. [...]
CERN-ACC-NOTE-2018-0080.-
Geneva : CERN, 2018 - 12 p.
- Published in : Phys. Rev. Accel. Beams 21 (2018) 124201
Fulltext: CERN-ACC-NOTE-2018-0080 - PDF; PhysRevAccelBeams.21.124201 - PDF;
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10.
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Novel measurement technique for the electromagnetic characterization of coating materials in the sub-THz frequency range
/ Passarelli, Andrea (CERN ; Darmstadt, Tech. U.) ; Bartosik, Hannes (CERN) ; Rumolo, Giovanni (CERN) ; Vaccaro, Vittorio Giorgio (INFN, Naples) ; Masullo, Maria Rosaria (INFN, Naples) ; Koral, Can (INFN, Naples) ; Papari, Gian Paolo (Naples U. ; INFN, Naples) ; Andreone, Antonello (Naples U. ; INFN, Naples) ; Boine-Frankenheim, Oliver (Darmstadt, Tech. U.)
This paper describes a reliable, handy, and inexpensive measurement system to characterize, in the sub-THz frequency range, the coating materials used in the beam pipes of accelerators. The method is based on time domain measurements of an electromagnetic wave passing through a waveguide having a thin central slab, where the coating material is deposited on both sides. [...]
2018 - 11 p.
- Published in : Phys. Rev. Accel. Beams 21 (2018) 103101
Fulltext: PDF;
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