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CERN Document Server 2,048 records found  1 - 10nextend  jump to record: Search took 0.42 seconds. 
1.
(100)
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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2.
(91)
Compensation of residual field from hollow electron lens asymmetries in the Large Hadron Collider / Rakic, Milica
The Large Hadron Collider (LHC) is currently the largest hadron collider in the world [...]
CERN-THESIS-2022-366 - 45 p.

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3.
(62)
ADT and OBSBOX in 2016 / Valuch, D (CERN) ; Hofle, W (CERN) ; Kotzian, G (CERN) ; Jaussi, M (CERN) ; Rains, S (CERN) ; Ojeda-Sandonis, M (CERN) ; Soderen, M E (CERN)
A performant transverse feedback is vital for accelerators like LHC. The LHC transverse feedback (ADT) provides a lot of important data and functionality outside of the " damping envelope ". [...]
Geneva : CERN, 2017 - 4 p. - Published in : (2017) , pp. 181-184 Fulltext: PDF;
In : 7th Evian Workshop on LHC beam operation, Evian Les Bains, France, 13 - 15 Dec 2016, pp.181-184
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4.
(59)
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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5.
(59)
First Attempts at using Active Halo Control at the LHC / Wagner, Joschka (Frankfurt U. ; CERN) ; Bruce, Roderik (CERN) ; Garcia Morales, Hector (CERN) ; Höfle, Wolfgang (CERN) ; Kotzian, Gerd (CERN) ; Kwee-Hinzmann, Regina (CERN) ; Langner, Andy (CERN) ; Mereghetti, Alessio (CERN) ; Quaranta, Elena (CERN) ; Redaelli, Stefano (CERN) et al.
The beam halo population is a non-negligible factor for the performance of the LHC collimation system and the machine protection. In particular this could become crucial for aiming at stored beam energies of 700 MJ in the High Luminosity (HL-LHC) project, in order to avoid beam dumps caused by orbit jitter and to ensure safety during a crab cavity failure. [...]
FERMILAB-CONF-16-276-AD-APC; CERN-ACC-2016-218.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-WEPMW028 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPMW028
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6.
(49)
Noise studies with new ADT pickups (MD4143) / Buffat, Xavier (CERN) ; Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Crockford, Guy (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Komppula, Jani Paavo Olavi ; Kotzian, Gerd (CERN) ; Mounet, Nicolas (CERN) ; Oeftiger, Adrian (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) et al.
An experiment aiming at characterizing the performance of a new engineering prototype for the ADT pickup readout electronics with a low noise floor from the point of view of beam stability and emittance growth in collision is described in this note [...]
CERN-ACC-NOTE-2019-0026. - 2019. - 12 p.
Full text
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7.
(47)
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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8.
(45)
Reconstruction of Transverse Phase Space From Transverse Feedback Data for Real Time Extraction of Vital LHC Machine Parameters / Kotzian, Gerd (CERN) ; Soderen, Martin (CERN) ; Solvang, Preben (CERN) ; Stopjakova, Viera (Bratislava, Inst. Phys.) ; Valuch, Daniel (CERN)
The LHC transverse feedback system (ADT) provides bunch by bunch, turn by turn, normalized and digitized beam position signals from four pick-ups per plane and for each beam. Together with already existing powerful computer-based observation systems, this data can be used to reconstruct in real-time the transverse phase space coordinates of the centre-of-charges, for each individual bunch. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 937-940 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.937-940
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Simulation of Hollow Electron Lenses as LHC Beam Halo Reducers using Merlin / Rafique, Haroon (Huddersfield U.) ; Barlow, Roger (Huddersfield U.) ; Appleby, Robert Barrie (Manchester U.) ; Tygier, S (Manchester U.) ; Bruce, Roderik (CERN) ; Redaelli, Stefano (CERN)
The Large Hadron Collider (LHC) and its High Luminosity (HL) upgrade foresee unprecedented stored beam energies of up to 700 MJ. The collimation system is responsible for cleaning the beam halo and is vital for successful machine operation. [...]
CERN-ACC-2015-0196.- Geneva : CERN, 2015 - 4 p. Fulltext: PDF;
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.TUPTY069
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10.
(43)
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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