CERN Accelerating science

Accelerator Physics

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2019-03-20
21:11
Operation and Configuration of the LHC in Run 2 / Wenninger, Jorg (CERN)
Between 2015 and 2018 the LHC was operated with protons at beam energies of 6.5 TeV with an integrated production of 160 fb-1 both ATLAS and CMS in proton operation. [...]
CERN-ACC-NOTE-2019-0007.
- 2019.

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2019-03-19
14:56
K-Modulation Software Development and Automation / Spitznagel, Martin Lukas
The k-modulation turned out to be the fastest and most precise tool to get a precise determination of the beam size directly at interaction points (IP) of the Large Hadron Collider (LHC) [...]
CERN-THESIS-2019-013 - 80 p.

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2019-03-19
06:54
Machine Learning Methods for Optics Measurements and Corrections at LHC / Fol, Elena (CERN) ; Carlier, Felix (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Garcia-Tabares, Ana (CERN) ; Tomás, Rogelio (CERN)
The application of machine learning methods and concepts of artificial intelligence can be found in various industry and scientific branches. In Accelerator Physics the machine learning approach has not found a wide application yet. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-WEPAF062 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPAF062

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2019-03-14
06:01
Instability studies at the CERN Proton Synchrotron during transition crossing / Migliorati, M (CERN ; U. Rome La Sapienza (main) ; INFN, Rome) ; Aumon, S (CERN) ; Koukovini-Platia, E (CERN) ; Huschauer, A (CERN) ; Métral, E (CERN) ; Sterbini, G (CERN) ; Wang, N (Beijing, Inst. High Energy Phys.)
The CERN Proton Synchrotron (PS) routinely crosses transition energy at around 6 GeV in order to accelerate protons that are injected in the Super Proton Synchrotron (SPS) or transferred to users of fixed target experiments. Depending on the beam parameters and intensity, a fast vertical coherent instability occurs during transition crossing. [...]
2018 - 13 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 120101 Fulltext from Publisher: PDF;

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2019-03-14
06:01
Electron cloud buildup and impedance effects on beam dynamics in the Future Circular $e^+e^-$ Collider and experimental characterization of thin TiZrV vacuum chamber coatings / Belli, E (CERN ; U. Rome La Sapienza (main) ; INFN, Rome) ; Costa Pinto, P (CERN) ; Rumolo, G (CERN) ; Sapountzis, A (CERN) ; Sinkovits, T (CERN) ; Taborelli, M (CERN) ; Spataro, B (Frascati) ; Zobov, M (Frascati) ; Castorina, G (U. Rome La Sapienza (main) ; INFN, Rome) ; Migliorati, M (U. Rome La Sapienza (main) ; INFN, Rome)
The Future Circular Collider FCC-ee is a study toward a high luminosity electron-positron collider with a centre-of-mass energy from 91 GeV to 365 GeV. Due to the beam parameters and pipe dimensions, collective effects and electron cloud can be very critical aspects for the machine and can represent the main limitations to its performance. [...]
2018 - 14 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 111002 Fulltext from Publisher: PDF;

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2019-03-14
06:01
Investigating Beam Loss Reduction with Octupoles During Slow Extraction in the CERN SPS / Stoel, Linda (CERN ; TU Vienna) ; Benedikt, Michael (CERN) ; Brown, Kevin (Brookhaven Natl. Lab.) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN)
Several different methods for reducing beam loss during resonant slow extraction at the CERN Super Proton Synchrotron (SPS) are being studied. One of these methods is the use of multipoles to manipulate the separatrices in order to reduce the fraction of protons hitting the thin wires of the electrostatic extraction septum (ES). [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUPAF051 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF051

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2019-03-14
06:01
Distributed Optical Fiber Radiation Sensing at CERN / Li Vecchi, Gaetano (CERN) ; Brugger, Markus (CERN) ; Danzeca, Salvatore (CERN) ; Di Francesca, Diego (CERN) ; Ferraro, Rudy (CERN) ; Girard, Sylvain (Lab. Hubert Curien, St. Etienne) ; Kadi, Yacine (CERN) ; Stein, Oliver (CERN)
CERN’s accelerator tunnels are very complex mixed field radiation environments, in which many electronic components and systems are installed. The radiation gen- erated by the circulating beam degrades all electronic equipment and impacts directly its lifetime. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-WEPAF083 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPAF083

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2019-03-12
08:43
Towards the Implementation of Laser Engineered Surface Structures for Electron Cloud Mitigation / Sitko, Monika (CERN) ; Abdolvand, Amin (Dundee U.) ; Baglin, Vincent (CERN) ; Bajek, David (Dundee U.) ; Calatroni, Sergio (CERN) ; Chiggiato, Paolo (CERN) ; Colling, Miriam (Daresbury) ; Di Girolamo, Beniamino (CERN) ; Garcia-Tabares Valdivieso, Elisa (CERN) ; Jones, Thomas (Daresbury) et al.
The LHC operation has proven that the electron cloud could be a significant limiting factor in machine performance, in particular for future High Luminosity LHC (HL-LHC) beams. Electron clouds, generated by electron multipacting in the beam pipes, leads to beam instabilities and beam-induced heat load in cryogenic systems. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUZGBE3 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUZGBE3

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2019-03-12
08:43
Injection and Dump Systems for a 13.5 TeV Hadron Synchrotron HE-LHC / Bartmann, Wolfgang (CERN) ; Barnes, Michael (CERN) ; Ducimetière, Laurent (CERN) ; Goddard, Brennan (CERN) ; Hofer, Michael (CERN) ; Kramer, Thomas (CERN) ; Lechner, Anton (CERN) ; Renner, Elisabeth (CERN) ; Sanz Ull, Alejandro (CERN) ; Senaj, Viliam (CERN) et al.
One option for a future circular collider at CERN is to build a 13.5 TeV hadron synchrotron, or High Energy LHC (HE-LHC) in the LHC tunnel. Injection and dump systems will have to be upgraded to cope with the higher beam rigidity and increased damage potential of the beam. [...]
2018 - 4 p. - Published in : (2018) , pp. TUPAF060
- Published in : J. Phys. : Conf. Ser.: 1067 (2018) , no. 5, pp. 052021 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF060

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2019-03-12
08:43
Beam Loss Measurements for Recurring Fast Loss Events During 2017 LHC Operation Possibly Caused by Macroparticles / Lechner, Anton (CERN) ; Auchmann, Bernhard (CERN) ; Bravin, Enrico (CERN) ; Gorzawski, Arkadiusz (CERN) ; Grob, Laura (CERN) ; Holzer, Eva Barbara (CERN) ; Lindstrom, Bjorn (CERN) ; Medvedeva, Tatiana (CERN) ; Mirarchi, Daniele (CERN) ; Schmidt, Ruediger (CERN) et al.
The availability of the LHC machine was adversely affected in 2017 by tens of beam aborts provoked by frequent loss events in one standard arc cell (16L2). In most of the cases, the dumps were triggered by concurrently developing fast beam instabilities leading to particle losses in the betatron cleaning insertion. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUPAF040 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF040

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