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1.
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Summary of the Working Group A: Beam Dynamics in Rings
/ Bartosik, Hannes (CERN) ; Rumolo, Giovanni (CERN) ; Vay, Jean-Luc (LBL, Berkeley) ; Wang, Na (Beijing, Inst. High Energy Phys.)
The HB-2023 workshop at CERN from October 9 to 13, 2023 is the continuation of the series of workshops, which started in 2002 at FNAL and rotates every two years between America, Europe and Asia. This contribution summarises the main highlights from Working Group A, Beam Dynamics in Rings, in terms of progress and challenges in the achievement of ever higher intensity and brightness hadron beams in accelerator rings around the world..
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 662-665
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.662-665
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CEPC Technical Design Report: Accelerator
/ CEPC Study Group Collaboration
The Circular Electron Positron Collider (CEPC) is a large scientific project initiated and hosted by China, fostered through extensive collaboration with international partners. The complex comprises four accelerators: a 30 GeV Linac, a 1.1 GeV Damping Ring, a Booster capable of achieving energies up to 180 GeV, and a Collider operating at varying energy modes (Z, W, H, and ttbar). [...]
arXiv:2312.14363; IHEP-CEPC-DR-2023-01; IHEP-AC-2023-01.-
2024-12-16 - 9 p.
- Published in : Radiat. Detect. Technol. Methods: 8 (2024) , no. 1, pp. 1-1105
Fulltext: 2312.14363 - PDF; Publication - PDF; document - PDF;
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3.
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Combined Effect of Beam-Beam Interaction and Beam Coupling Impedance in Future Circular Colliders
/ Zhang, Yuan (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Carideo, Emanuela (CERN ; Rome U. ; INFN, Rome) ; Migliorati, Mauro (Rome U. ; INFN, Rome) ; Wang, Na (Beijing, Inst. High Energy Phys.) ; Zobov, Mikhail (Frascati)
The future large scale electron-positron colliders, such as FCC-ee in Europe and CEPC in China, will rely on the crab waist collision scheme with a large Piwinski angle. Differently from the past generation colliders both luminosity and beam-beam tune shifts depend on the bunch length in such a collision scheme. [...]
JACoW, 2021 - 6 p.
- Published in : JACoW IPAC 2021 (2021) 25-30
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.25-30
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4.
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Mitigation of coherent beam instabilities in CEPC
/ Wang, Na (Beijing, Inst. High Energy Phys.) ; Zhang, Yuan (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Liu, Yudong (Beijing, Inst. High Energy Phys.) ; Tian, Saike (Beijing, Inst. High Energy Phys.) ; Ohmi, Kazuhito (KEK, Tsukuba) ; Lin, Chuntao (Beijing, Inst. High Energy Phys. ; KEK, Tsukuba)
The collective beam instabilities are potential restrictions in the Circular Electron Positron Collider (CEPC) to achieve high luminosity performance. These instabilities can induce beam quality degradation or beam losses. [...]
2020 - 5 p.
- Published in : 10.23732/CYRCP-2020-009.286
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.286-290 (CERN-2020-009)
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5.
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Building the impedance model of a real machine
/ Salvant, Benoit (CERN) ; Amorim, David (CERN ; Grenoble, INP) ; Antipov, Sergey (CERN) ; Arsenyev, Sergey (CERN) ; Beck, Mario (CERN) ; Biancacci, Nicolo (CERN) ; Brüning, Oliver (CERN) ; Campelo, Jose Enrique (CERN) ; Carideo, Emanuela (CERN) ; Caspers, Fritz (CERN) et al.
A reliable impedance model of a particle accelerator can be built by combining the beam coupling impedances of all the components. This is a necessary step to be able to evaluate the machine performance limitations, identify the main contributors in case an impedance reduction is required, and study the interaction with other mechanisms such as optics nonlinearities, transverse damper, noise, space charge, electron cloud, beam-beam (in a collider). [...]
CERN-ACC-2019-098.-
2019 - 6 p.
- Published in : 10.18429/JACoW-IPAC2019-WEYPLS1
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEYPLS1
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6.
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CEPC Conceptual Design Report: Volume 2 - Physics & Detector
/ CEPC Study Group Collaboration
The Circular Electron Positron Collider (CEPC) is a large international scientific facility proposed by the Chinese particle physics community to explore the Higgs boson and provide critical tests of the underlying fundamental physics principles of the Standard Model that might reveal new physics. [...]
arXiv:1811.10545 ; IHEP-CEPC-DR-2018-02 ; IHEP-EP-2018-01 ; IHEP-TH-2018-01.
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2018 - 424.
Fulltext
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7.
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HL-LHC impedance and related effects
/ Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Biancacci, Nicolo (CERN) ; Salvant, Benoit (CERN) ; Arpaia, Pasquale (Universita e sezione INFN di Napoli (IT)) ; Barnes, Mike (CERN) ; Bonanno, Edoardo (Universita degli studi di Palermo (IT)) ; Calaga, Rama (CERN) ; Carideo, Emanuela (Universita del Sannio (IT)) ; Day, Hugo Alistair et al.
This note aims at gathering the work done by CERN and collaborators on the HL-LHC beam coupling impedance in the recent years and identifying the next steps [...]
CERN-ACC-NOTE-2018-0087.
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2018. - 93 p.
Full text
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8.
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Simulation of Instability at Transition Energy with a New Impedance Model for CERN PS
/ Wang, Na (Beijing, Inst. High Energy Phys. ; CERN) ; Aumon, Sandra (CERN) ; Biancacci, Nicolo (CERN) ; Migliorati, Mauro (INFN, Rome ; CERN) ; Persichelli, Serena (U. Rome La Sapienza (main)) ; Sterbini, Guido (CERN)
Instabilities driven by the transverse impedance are proven to be one of the limitations for the high intensity reach of the CERN PS. Since several years, fast single bunch vertical instability at transition energy has been observed with the high intensity bunch serving the neu-tron Time-of-Flight facility (n-ToF). [...]
CERN-ACC-2016-233.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-TUPOR010
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPOR010
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9.
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Current Status of Instability Threshold Measurements in the LHC at 6.5 TeV
/ Carver, Lee (CERN) ; Barranco, Javier (Ecole Polytechnique, Lausanne) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Höfle, Wolfgang (CERN) ; Kotzian, Gerd (CERN) ; Lefèvre, Thibaut (CERN) ; Levens, Thomas (CERN) ; Métral, Elias (CERN) ; Pieloni, Tatiana (CERN) et al.
Throughout 2015, many measurements of the minimum stabilizing octupole current required to prevent coherent transverse instabilities have been performed. These measurements allow the LHC impedance model at flat top to be verified and give good indicators of future performance and limitations. [...]
CERN-ACC-2016-234.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-TUPMW011
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMW011
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10.
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Beam Induced RF Heating in LHC in 2015
/ Salvant, Benoit (CERN) ; Aberle, Oliver (CERN) ; Albert, Markus (CERN) ; Alemany-Fernandez, Reyes (CERN) ; Arduini, Gianluigi (CERN) ; Baechler, Joachim (CERN) ; Barnes, Michael (CERN) ; Baudrenghien, Philippe (CERN) ; Berrig, Olav (CERN) ; Biancacci, Nicolo (CERN) et al.
Following the recurrent beam induced RF issues that perturbed LHC operation during LHC Run 1, a series of actions were put in place to minimize the risk that similar issues would occur in LHC Run 2: longitudinal impedance reduction campaign and/or improvement of cooling for equipment that were problematic or at the limit during Run 1, stringent constraints enforced on new equipment that would be installed in the machine, tests to control the bunch length and longitudinal distribution, additional monitoring of temperature, new monitoring tools and warning chains. This contribution reports the outcome of these actions, both successes as well as shortcomings, and details the lessons learnt for the future runs..
CERN-ACC-2016-279.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-MOPOR008
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.MOPOR008
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