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CERN Document Server 2,050 elementer funnet  1 - 10nesteslutt  gå til element: Søket tok 0.55 sekunder. 
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Conceptual Design of the HL-LHC Hollow Electron Lens Superconducting Magnet System / Foussat, Arnaud (CERN) ; Bragin, Alexey (Novosibirsk, IYF) ; Ferlin, Gerard (CERN) ; Kirby, Glyn (CERN) ; Kolehmainen, Antti (CERN) ; Nikiforov, Danila (Novosibirsk, IYF) ; Pavliuchenko, Vadim (Novosibirsk, IYF) ; Perini, Diego (CERN) ; Petrone, Carlo (CERN) ; Redaelli, Stefano (CERN) et al.
The Hollow Electron Lens (HEL) units are part of the upgrade baseline of the High-Luminosity LHC accelerator (HL-LHC) and will be installed in the machine ring at point P4 on each counter-rotating LHC proton beamline during a long shutdown in 2025-2027 at CERN. The main goal is to improve the collimation system performance by controlling beam energy loss in the beam halo. [...]
2022 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 32 (2022) 4100905
In : 27th International Conference on Magnet Technology (MT-27), Fukuoka, Japan, 15 - 19 Nov 2021, pp.4100905
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Quench Protection of the HL-LHC Hollow Electron Lens Superconducting Solenoid Magnets / Wozniak, Mariusz (CERN) ; Foussat, Arnaud (CERN) ; Yammine, Samer (CERN) ; Steckert, Jens (CERN) ; Ravaioli, Emmanuele (CERN) ; Verweij, Arjan (CERN) ; Kolehmainen, Antti (CERN) ; Redaelli, Stefano (CERN) ; Rossi, Adriana (CERN)
The High-Luminosity LHC (HL-LHC) project is an upgrade of the Large Hadron Collider (LHC) and comprises the installation of two Hollow Electron Lens (HEL) systems, each acting on one beam on both sides of LHC Point 4. The systems aim for a controlled depletion of hadron beam tails and an enhanced hadron beam halo collimation. [...]
2022 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 32 (2022) 4701205
In : 27th International Conference on Magnet Technology (MT-27), Fukuoka, Japan, 15 - 19 Nov 2021, pp.4701205
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Preliminary Design Study of the Hollow Electron Lens for LHC / Perini, Diego (CERN) ; Zanoni, Carlo (CERN)
A Hollow Electron Lens (HEL) has been proposed in order to improve performance of halo control and collimation in the Large Hadron Collider in view of its High Luminosity upgrade (HL-LHC). [...]
arXiv:1702.00234 ; CERN-ACC-NOTE-2017-0004. - 2017. - 24 p.
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Design of high-performance guns for the HL-LHC HEL / Perini, D (CERN) ; Kolhemainen, A (CERN) ; Rossi, A (CERN) ; Sadovich, S (CERN) ; Stancari, G (Fermilab)
The High Luminosity LHC project (HL-LHC) foresees the construction and installation of important new equipment to increase the performance of the LHC machine. The Hollow Electron Lens (HEL) is a promising system to control the beam halo. [...]
FERMILAB-PUB-21-199-AD.- 2021 - 9 p. - Published in : JINST 16 (2021) T03010 Fulltext: PDF;
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Preliminary Mechanical Design Study of the Hollow Electron Lens for HL-LHC / Zanoni, Carlo (CERN) ; Gobbi, Giorgia (CERN) ; Perini, Diego (CERN) ; Stancari, Giulio (Fermilab)
A Hollow Electron Lens (HEL) has been proposed in order to improve performance of halo control and collimation in the Large Hadron Collider in view of its High Luminosity upgrade (HL-LHC). The concept is based on a hollow beam of electrons that travels around the protons for a few meters. [...]
FERMILAB-CONF-17-275-AD-APC; CERN-ACC-2017-309.- 2017 - 7 p. - Published in : J. Phys.: Conf. Ser.
- Published in : (2017) , pp. WEPVA117 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPVA117
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Electron dynamics for high-intensity hollow electron beams / Rossi, A (CERN) ; Nikiforov, D (Novosibirsk, IYF) ; Arsentyeva, M (Novosibirsk, IYF) ; Barnyakov, A (Novosibirsk, IYF) ; Levichev, A (Novosibirsk, IYF)
Hollow Electron Lenses (HEL) will be installed at the High Luminosity Large Hadron Collider to provide a continuous and controlled depletion of beam halo particles by interaction with a superimposed hollow electron beam, of intensity as high as 5 A, and radii 1.1–2.2 mm for 7 TeV LHC operations. In this paper, issues related to the propagation of high intensity hollow electron beams are discussed and the simulations of the electron beam dynamics with feedback to the HEL design are presented. [...]
2021 - 16 p. - Published in : JINST 16 (2021) P03043 Fulltext: PDF;
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The development programme of cathodes and electron guns for the hollow electron lenses of the High Luminosity LHC project / Perini, Diego (CERN) ; Crawford, Darren (Fermilab) ; Feng, Jinjun (Vacuum Elect. Res. Inst., Beijing) ; Gobbi, Giorgia (CERN) ; Li, Zepeng (Vacuum Elect. Res. Inst., Beijing) ; Liu, Wei (Beijing U. of Tech.) ; Ruan, Jinhao (Fermilab) ; Shao, Wensheng (Vacuum Elect. Res. Inst., Beijing) ; Stancari, Giulio (Fermilab) ; Valerio, Linda (Fermilab) et al.
The High Luminosity LHC project (HL-LHC) foresees the construction and installation of important new equipment to increase the performance of the LHC machine. The Hollow Electron Lens (HEL) is a promising system to control the beam halo. [...]
CERN-ACC-2019-170.- 2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS099 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS099
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Nonlinear dynamics of proton beams with hollow electron lens in the CERN high-luminosity LHC / Mirarchi, D (CERN ; U. Manchester (main)) ; Appleby, R B (U. Manchester (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Bruce, R (CERN) ; Giovannozzi, M (CERN) ; Mereghetti, A (CERN) ; Redaelli, S (CERN) ; Stancari, G (Fermilab)
The design stored beam energy in the CERN high-luminosity large hadron collider (HL-LHC) upgrade is about 700 MJ, with about 36 MJ in the beam tails, according to estimates based on scaling considerations from measurements at the LHC. Such a large amount of stored energy in the beam tails poses serious challenges on its control and safe disposal. In particular, orbit jitters can cause significant losses on primary collimators, which can lead to accidental beam dumps, magnet quenches, or even permanent damage to collimators and other accelerator elements. [...]
FERMILAB-PUB-21-713-AD.- 2022 - 28 p. - Published in : Eur. Phys. J. Plus 137 (2022) 7 Fulltext from Publisher: PDF;
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Hollow Electron Beam Collimation For HL-LHC - Effect On The Beam Core / Fitterer, M (Fermilab) ; Stancari, G (Fermilab) ; Valishev, A (Fermilab) ; Bruce, R (CERN) ; Papadopoulou, S (CERN) ; Papotti, G (CERN) ; Pellegrini, D (CERN) ; Redaelli, S (CERN) ; Valuch, D (CERN) ; Wagner, J F (CERN)
Collimation with hollow electron beams or lenses (HEL) is currently one of the most promising concepts for active halo control in HL-LHC. In previous studies it has been shown that the halo can be efficiently removed with a hollow electron lens. [...]
FERMILAB-CONF-16-387-AD; NAPAC-2016-WEA1CO04.- 2017 - 4 p. - Published in : 10.18429/JACoW-NAPAC2016-WEA1CO04 Fulltext: fermilab-conf-16-387-ad - PDF; wea1co04 - PDF; External links: FERMILABCONF; JACoW
In : 2016 North American Particle Accelerator Conference, Chicago, IL, USA, 9 - 14 Oct 2016, pp.WEA1CO04
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Thermomechanical Assessment of the Collector for the Hollow Electron Lens / Anderson, George Bowers
The hollow electron lens (HEL) is a system proposed for the High Luminosity upgrade of the Large Hadron Collider LHC (HL-LHC) [1] [...]
CERN-STUDENTS-Note-2017-187. - 2017
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