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CERN Document Server 12 records found  1 - 10next  jump to record: Search took 0.58 seconds. 
1.
The electron cloud and its impact on LHC and future colliders / Mether, Lotta (CERN) ; Iadarola, Giovanni (CERN) ; Rumolo, Giovanni (CERN) ; Paraschou, Konstantinos (CERN) ; Sabato, Luca (Ecole Polytechnique, Lausanne) ; Johannesson, Sofia (Ecole Polytechnique, Lausanne)
The secondary emission of electrons and their interaction with the electromagnetic fields of charged particle beams can lead to the build-up of electron clouds in accelerator beam chambers. The interaction of the electrons with both the beam and the chamber walls leads to detrimental effects, such as transverse instabilities and emittance growth, beam loss, pressure rise and heat load. [...]
2024 - 6 p. - Published in : JACoW IPAC 2024 (2024) WEZD2 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEZD2
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2.
Selected advances in the accelerator design of the Future Circular Electron-Positron Collider (FCC-ee) / FCC Collaboration
In autumn 2023, the FCC Feasibility Study underwent a crucial “mid-term review”. We describe some accelerator performance risks for the proposed future circular electron-positron collider, FCC-ee, identified for, and during, the mid-term review. [...]
FERMILAB-CONF-24-0659-AD-PIP2.- 2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) WEPR14 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPR14
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3.
Electron Cloud Effects in the CERN Accelerators in Run 3 / Mether, Lotta (CERN) ; Bartosik, Hannes (CERN) ; Giacomel, Lorenzo (CERN) ; Iadarola, Giovanni (CERN) ; Johannesson, Sofia (CERN) ; Mases Solé, Ingrid (CERN) ; Paraschou, Konstantinos (CERN) ; Rumolo, Giovanni (CERN) ; Sabato, Luca (CERN) ; Zannini, Carlo (CERN) et al.
Several of the machines in the CERN accelerator complex, in particular the Large Hadron Collider (LHC) and the Super Proton Synchrotron (SPS), are prone to the build-up of electron clouds. Electron cloud effects are observed especially when the machines are operated with a 25 ns bunch spacing, which has routinely been used in the LHC since the start of its second operational run in 2015. [...]
2024 - 5 p. - Published in : JACoW HB 2023 (2024) 538-542 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.538-542
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4.
Progress in Mastering Electron Clouds at the Large Hadron Collider / Iadarola, Giovanni (CERN) ; Bradu, Benjamin (CERN) ; Mether, Lotta (CERN) ; Paraschou, Konstantinos (CERN) ; Petit, Valentine (CERN) ; Rumolo, Giovanni (CERN) ; Sabato, Luca (CERN) ; Skripka, Galina (CERN) ; Taborelli, Mauro (CERN) ; Tavian, Laurent (CERN)
During the second operational run of the Large Hadron Collider (LHC) a bunch spacing of 25 ns was used for the first time for luminosity production. With such a spacing, electron cloud effects are much more severe than with the 50-ns spacing, which had been used in the previous run. [...]
JACoW, 2021 - 6 p. - Published in : JACoW IPAC 2021 (2021) 1273-1278 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1273-1278
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5.
A Measurement Method Based on RF Deflector for Particle Bunch Longitudinal Parameters in Linear Accelerators / Sabato, Luca (CERN) ; Arpaia, Pasquale (CERN ; Naples U.) ; Gilardi, Antonio (CERN ; Naples U.) ; Mostacci, Andrea (Rome U.) ; Palumbo, Luigi (Rome U.) ; Variola, Alessandro (Frascati)
In high-brightness electron linear accelerators (LINACs), the particle bunch length is measured by a radio frequency deflector (RFD). The electron bunch is deflected vertically toward a screen and its length can be obtained using vertical spot size measurements after a proper calibration, e.g., measuring the vertical bunch centroid while varying the deflecting voltage phase. [...]
2021 - 9 p. - Published in : IEEE Trans. Instrum. Meas. 70 (2021) 1-9
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6.
A Vlasov approach to study transverse instabilities driven by electron clouds / Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN) ; Mounet, Nicolas (CERN) ; Sabato, Luca
We present a linearized method to study transverse instabilities due to electron clouds. [...]
CERN-ACC-NOTE-2020-0054. - 2020. - 22 p.
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7.
Linearized method for the study of transverse instabilities driven by electron clouds / Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN) ; Mounet, Nicolas (CERN) ; Sabato, Luca (CERN)
We present a linearized method to study transverse instabilities due to electron clouds. It is based on an accurate and compact characterization of the cloud dipolar and quadrupolar forces, that can be easily obtained from quick single-pass numerical simulations. [...]
2020 - 15 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 081002 Fulltext from Publisher: PDF;
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8.
Numerical simulations studies on single-bunch instabilities driven by electron clouds at the LHC / Sabato, Luca (CERN) ; Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN)
Instabilities driven by electron clouds in the LHC are studied by means of numerical simulations performed with the PyECLOUD-PYHEADTAIL suite. [...]
CERN-ACC-NOTE-2020-0050. - 2020. - 29 p.
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9.
Enhancing particle bunch-length measurements based on Radio Frequency Deflector by the use of focusing elements / Arpaia, Pasquale (U. Naples (main)) ; Corsini, Roberto (CERN) ; Gilardi, Antonio (U. Naples (main) ; CERN) ; Mostacci, Andrea (U. Rome La Sapienza (main)) ; Sabato, Luca (CERN) ; Sjobak, Kyrre N (CERN ; U. Oslo (main))
A method to monitor the length of a particle bunch, based on the combination of a Radio Frequency Deflector (RFD) with magnetic focusing elements, is presented. With respect to state-of-the-art bunch length measurement, the additional focusing element allows to measure also the correlations between the longitudinal and transverse planes in terms of both position and divergence. [...]
2020 - 12 p. - Published in : Sci. Rep. 10 (2020) 11457 Fulltext: PDF;
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10.
Beam-induced heat loads on the LHC arc beam screens with different beam and machine configurations: experiments and comparison against simulations / Iadarola, Giovanni (CERN) ; Skripka, Galina (Joint Institute for Nuclear Research (RU)) ; Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Andujar, Oscar (CERN) ; Antipov, Sergey (CERN) ; Arduini, Gianluigi (CERN) ; Argyropoulos, Theodoros (CERN) ; Bradu, Benjamin (CERN) ; Bartosik, Hannes (CERN) et al.
Electron cloud (e-cloud) effects are among the main performance limitations for the operation of the Large Hadron Collider (LHC) with 25 ns bunch spacing. [...]
CERN-ACC-NOTE-2019-0057. - 2019. - 50 p.
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