1.
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HL-LHC Beam Dynamics with Hollow Electron Lenses
/ Hermes, Pascal (CERN) ; Bruce, Roderik (CERN) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Mereghetti, Alessio (CERN) ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN) ; Stancari, Giulio (Fermilab)
Each of the two proton beams in the High-Luminosity Large Hadron Collider (HL-LHC) will carry a total energy of 700 MJ. One concern for machine protection is the energy stored in the transverse beam halo, estimated to potentially reach up to 5% of the total stored energy. [...]
FERMILAB-CONF-22-369-AD.-
2022 - 6 p.
- Published in : JACoW HB 2021 (2022) 59-64
Fulltext: jt - PDF; document - PDF; External link: Fermilab Library Server
In : 64th ICFA Advanced Beam Dynamics Workshop on High Intensity and High Brightness Hadron Beams (HB 2021), Batavia, Illinois, United States, 4 - 9 Oct 2021, pp.59-64
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2.
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A Novel Tool for Beam Dynamics Studies with Hollow Electron Lenses
/ Hermes, Pascal (CERN) ; Bruce, Roderik (CERN) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Iadarola, Giovanni (CERN) ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN)
Hollow Electron Lenses (HELs) are crucial components of the CERN LHC High Luminosity Upgrade (HL-LHC), serving the purpose of actively controlling the population of the transverse beam halo to reduce particle losses on the collimation system. Symplectic particle tracking simulations are required to optimize the efficiency and study potentially undesired beam dynamics effects with the HELs. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 176-179
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.176-179
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3.
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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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4.
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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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5.
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Hollow Electron Beam Collimation for HL-LHC - Effects on the Beam Core
/ Fitterer, M (Fermilab) ; Stancari, G (Fermilab) ; Valishev, A (Fermilab) ; Bruce, R (CERN) ; Papotti, G (CERN) ; Redaelli, S (CERN) ; Valentino, G (CERN ; Malta U.) ; Valentino, G (CERN) ; Valuch, D (CERN) ; Xu, C (CERN)
Collimation with hollow electron beams is currently one of the most promising concepts for active halo control in the High Luminosity Large Hadron Collider (HL-LHC). To ensure the successful operation of the hollow beam collimator the unwanted effects on the beam core, which might arise from the operation with a pulsed electron beam, must be minimized. [...]
FERMILAB-CONF-17-153-AD; CERN-ACC-2017-306.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-WEOBA2
Fulltext: weoba2 - PDF; fermilab-conf-17-153-ad - PDF; External link: FERMILABCONF
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEOBA2
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6.
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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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7.
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Commissioning strategies of hollow electron lens residual kick compensation
/ Rakic, M (Ecole Polytechnique, Lausanne) ; Bruce, R (CERN) ; Giovannozzi, M (CERN) ; Hermes, P (CERN) ; Kotzian, G (CERN) ; Redaelli, S (CERN) ; Soderen, M (CERN) ; Valuch, D (CERN)
Hollow electron lenses (HELs) could be used in the HL-LHC to selectively remove halo particles from the circulating beams. While the ideal design should leave particles in the beam core unaffected, in reality, the core particles will be exposed to a small residual kick that could induce transverse emittance blowup if not properly compensated while the HEL is operated in pulsed mode. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPL031
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL031
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8.
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Hollow electron-lens assisted collimation and plans for the LHC
/ Mirarchi, D (CERN ; Manchester U.) ; Garcia Morales, H (CERN ; Royal Holloway, U. of London) ; Mereghetti, A (CERN) ; Redaelli, S (CERN) ; Wagner, Joschka (CERN ; Goethe U., Frankfurt (main)) ; Fischer, W (Brookhaven Natl. Lab.) ; Gu, X (Brookhaven Natl. Lab.) ; Stancari, G (Fermilab)
The hollow electron lens (e-lens) is a very powerful and advanced tool for active control of diffusion speed of halo particles in hadron colliders. Thus, it can be used for a controlled depletion of beam tails and enhanced beam halo collimation. [...]
FERMILAB-CONF-18-311-AD-APC.-
2018 - 7 p.
- Published in : 10.18429/JACoW-HB2018-TUP1WE02
Fulltext: PDF; External link: FERMILABCONF
In : 61st ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Daejeon, Korea, 17 - 22 Jun 2018, pp.TUP1WE02
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9.
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High Luminosity LHC Hollow Electron Lens Collimation using MERLIN
/ Rafique, Haroon (Huddersfield U.) ; Appleby, Robert (Manchester U.) ; Barlow, Roger (Huddersfield U.) ; Bruce, Roderik (CERN) ; Redaelli, Stefano (CERN) ; Tygier, Sam (Manchester U.) ; Wagner, Joschka (CERN)
The high luminosity large hadron collider (HL-LHC) upgrade envisions an unprecedented stored beam energy of up to 700 MJ. To protect the machine during operation, an efficient collimation system is vital. [...]
2016 - 4 p.
- Published in : 10.18429/JACoW-ICAP2015-MODBC2
Fulltext: PDF;
In : Proceedings, 12th International Computational Accelerator Physics Conference, ICAP2015, Shanghai, China, 12 - 16 Oct 2015, pp.MODBC2
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10.
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Electron beam dynamics simulation for electron lenses
/ Sadovich, Sergey (CERN) ; Rossi, Adriana (CERN) ; Stancari, Giulio (Fermilab)
A test stand is under construction at CERN to study high perveance electron guns, electron beam dynamics, and electron beam diagnostics for electron lenses. It will be used to test electron guns for the Hollow Electron Lenses under consideration for beam halo control for High Luminosity LHC (CERN), and for the Space Charge Compensation at SIS18 (GSI) in the frame of the EU funded ARIES project. [...]
CERN-ACC-2019-107.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-WEPTS048
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS048
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