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Interim report for the International Muon Collider Collaboration
/ Accettura, C.
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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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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Reduction of the beam-coupling impedance in accelerating structures using metamaterial-based absorbers
/ Masullo, M R (INFN, Naples) ; Pugliese, A (INFN, Naples) ; Chikhi, N (INFN, Naples) ; Vaccaro, V G (INFN, Naples) ; Losito, R (CERN) ; Masi, A (CERN) ; Koral, C (Naples U.) ; Papari, G P (Naples U.) ; Andreone, A (Naples U.)
Resistive-wall impedance constitutes a significant percentage of the total beam-coupling
impedance budget of an accelerator. Under extreme conditions, like large power handling and ultrahigh vacuum, metamaterial-based absorbers can represent a valid alternative to other approaches for
impedance mitigation in specific accelerator components, like resonant (parasitic) cavities or
collimators operating along the beam line. [...]
2018 - 3 p.
- Published in : 10.1109/metamaterials.2018.8534145
In : 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials 2018), Espoo, Finland, 27 Aug - 1 Sep 2018, pp.278-280
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Secondary electron yield reduction by femtosecond pulse laser-induced periodic surface structuring
/ Nivas, J J J (INFN, Naples ; Naples U. ; CNR-SPIN, Naples) ; Valadan, M (Naples U.) ; Salvatore, M (Naples U.) ; Fittipaldi, R (Salerno U.) ; Himmerlich, M (CERN) ; Rimoldi, M (CERN) ; Passarelli, A (Naples U.) ; Allahyari, E (INFN, Naples) ; Oscurato, S L (Naples U.) ; Vecchione, A (CNR-SPIN, Naples) et al.
The electron-cloud phenomenon is one cause of beam instabilities in high intensity positive particle accelerators. Among the proposed techniques to mitigate or control this detrimental effect, micro-/nano-geometrical modifications of vacuum chamber surfaces are promising to reduce the number of emitted secondary electrons. [...]
2021
- Published in : Surfaces and Interfaces 25 (2021) 101179
fulltext from publisher: PDF;
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Tailored metamaterial-based absorbers for high order mode damping
/ Masullo, M R (INFN, Naples) ; Vaccaro, V G (INFN, Naples) ; Chikhi, N (Naples U.) ; Passarelli, A (Naples U. ; INFN, Naples) ; Andreone, A (Naples U. ; INFN, Naples)
In modern particle accelerators, satisfying the desired beam properties (high currents, high luminosities, etc.) increasingly implies limiting the total beam coupling impedance, which depends on the machine and the parameters of the circulating beams. A number of different reduction techniques have been proposed during the years depending on the specific applications, ranging from higher order modes (HOM) damping to solutions entailing high electrical-conductivity coatings of the pipe. [...]
2020 - 5 p.
- Published in : 10.23732/CYRCP-2020-009.373
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.373 (CERN-2020-009)
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Time domain measurements of the sub-THz response of different coatings for beam pipe walls
/ Passarelli, A (Naples U. ; INFN, Naples) ; Andreone, A (Naples U. ; INFN, Naples) ; Vaccaro, V G (INFN, Naples) ; Masullo, M R (INFN, Naples) ; Papaphilippou, Y (CERN) ; Corsini, R (CERN)
Modern accelerators and light sources often require special treatment of the vacuum chamber surface in order to avoid undesirable effects and maximize machine performance. Coatings with Non Evaporable Getter compounds and amorphous Carbon have been extensively tested and used with very effective results since they allow to reduce the secondary electron emission from pipe walls and therefore the relevant beam instability. [...]
2020 - 5 p.
- Published in : 10.23732/CYRCP-2020-009.300
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.300 (CERN-2020-009)
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Sub-THz EM characterization of coated material
/ Passarelli, A (CERN) ; Bartosik, H (CERN) ; Rumolo, G (CERN) ; Vaccaro, V G (INFN, Naples) ; Masullo, M R (INFN, Naples) ; Koral, C (INFN, Naples) ; Andreone, A (Naples U.) ; Boine-Frankenheim, O (Darmstadt, Tech. U.)
The electromagnetic characterization of coating materials is fundamental to build a reliableimpedance model of any accelerator. In particular, since the CLIC (Compact LInear Collider)necessitates bunches with short longitudinal length, a full electromagnetic characterization of thecoating material surface impedance is needed at high frequencies in the millimetric wave length andbeyond. [...]
2020 - 8 p.
Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.83-90 (CERN-2020-007)
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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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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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