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1.
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Project management structures, processes, and tools for the HL-LHC project
/ Vandoni, Giovanna (CERN) ; Brüning, Oliver (CERN) ; Di Girolamo, Beniamino (CERN) ; Fessia, Paolo (CERN) ; Garcia Gavela, Hector (CERN) ; Jensen, Lars (CERN) ; Modena, Michele (CERN) ; Noels, Cecile (CERN) ; Tavian, Laurent (CERN) ; Zerlauth, Markus (CERN)
At its restart after a major shutdown in 2029, the LHC will see its interaction regions upgraded by the installation of the HL-LHC equipment, with new Nb3Sn triplets and cold powering system, crab-cavities for crossing angle compensation and luminosity levelling, an upgraded collimation system, and fully remote alignment for the final focusing region. In the following operational runs, the LHC will aim at a tenfold increase of the integrated luminosity compared to the original design. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) TUPA154
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.TUPA154
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2.
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The HL-LHC Project Gets Ready for Its Deployment
/ Zerlauth, Markus (CERN) ; Brüning, Oliver (CERN) ; Di Girolamo, Beniamino (CERN) ; Fessia, Paolo (CERN) ; Gaignant, Christelle (CERN) ; Garcia Gavela, Hector (CERN) ; Maclean, Ewen (CERN) ; Modena, Michele (CERN) ; Otto, Thomas (CERN) ; Tavian, Laurent (CERN) et al.
Following the successful completion of the second long shutdown (LS2), the Large Hadron Collider (LHC) is preparing for its final operational run before the majority of the High Luminosity Upgrade (HL-LHC) will be installed during the third Long Shutdown starting in 2026. The HL-LHC upgrade will enable a further tenfold increase in integrated luminosity delivered to the ATLAS and CMS experiments, starting by an upgrade of the machine protection, collimation and shielding systems in LS2, and followed by the deployment of novel key technologies, including Nb₃Sn based insertion region magnets, cold powering by MgB₂ superconducting links and integration of Nb crab-cavities to compensate the effects of a larger crossing angle. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 50-53
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.50-53
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Origin and Mitigation of the Beam-Induced Surface Modifications of the LHC Beam Screens
/ Petit, Valentine (CERN) ; Chiggiato, Paolo (CERN) ; Himmerlich, Marcel (CERN) ; Marinoni, Stefano (CERN) ; Neupert, Holger (CERN) ; Taborelli, Mauro (CERN) ; Tavian, Laurent (CERN)
All over Run 2, the LHC beam-induced heat load on the cryogenic system exhibited a wide scattering along the ring. Studies ascribed the heat source to electron cloud build-up, indicating an unexpected high Secondary Electron Yield (SEY) of the beam screen surface in some LHC regions. [...]
2022 - 3 p.
- Published in : JACoW IPAC 2022 (2022) 780-782
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.780-782
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4.
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Progress in Mastering Electron Clouds at the Large Hadron Collider
/ Iadarola, Giovanni (CERN) ; Bradu, Benjamin (CERN) ; Mether, Lotta (CERN) ; Paraschou, Konstantinos (CERN) ; Petit, Valentine (CERN) ; Rumolo, Giovanni (CERN) ; Sabato, Luca (CERN) ; Skripka, Galina (CERN) ; Taborelli, Mauro (CERN) ; Tavian, Laurent (CERN)
During the second operational run of the Large Hadron Collider (LHC) a bunch spacing of 25 ns was used for the first time for luminosity production. With such a spacing, electron cloud effects are much more severe than with the 50-ns spacing, which had been used in the previous run. [...]
JACoW, 2021 - 6 p.
- Published in : JACoW IPAC 2021 (2021) 1273-1278
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1273-1278
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5.
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Beam-induced heat loads on the LHC arc beam screens with different beam and machine configurations: experiments and comparison against simulations
/ Iadarola, Giovanni (CERN) ; Skripka, Galina (Joint Institute for Nuclear Research (RU)) ; Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Andujar, Oscar (CERN) ; Antipov, Sergey (CERN) ; Arduini, Gianluigi (CERN) ; Argyropoulos, Theodoros (CERN) ; Bradu, Benjamin (CERN) ; Bartosik, Hannes (CERN) et al.
Electron cloud (e-cloud) effects are among the main performance limitations for the operation of the Large Hadron Collider (LHC) with 25 ns bunch spacing. [...]
CERN-ACC-NOTE-2019-0057.
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2019. - 50 p.
Full text
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6.
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Updated High-Energy LHC design
/ Zimmermann, Frank (CERN) ; Abelleira, Jose Luis (JAI, UK) ; Abramov, Andrey (JAI, UK ; Royal Holloway, U. of London) ; Amorim, David (CERN) ; Antipov, Sergey (CERN) ; Apyan, Armen (Yerevan Phys. Inst.) ; Arsenyev, Sergey (CERN) ; Barranco, Javier (Ecole Polytechnique, Lausanne) ; Benedikt, Michael (CERN) ; Bruce, Roderik (CERN) et al.
We present updated design parameters for a future High-Energy LHC. A more realistic turnaround time has led to a revision of the target peak luminosity, as well as a choice of a larger IP beta function, and longer physics fills. [...]
CERN-ACC-2019-089.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPMP037
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPMP037
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7.
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Future Circular Collider - European Strategy Update Documents High-Energy LHC (HE-LHC)
/ Zimmermann, Frank (CERN) ; Benedikt, Michael (CERN) ; Capeans Garrido, Mar (CERN) ; Cerutti, Francesco (CERN) ; Goddard, Brennan (CERN) ; Gutleber, Johannes (CERN) ; Jimenez, Jose Miguel (CERN) ; Mangano, Michelangelo (CERN) ; Mertens, Volker (CERN) ; Osborne, John Andrew (CERN) et al.
This report contains the description of a novel research infrastructure based on a high-energy hadron collider, which extends the current energy frontier by almost a factor 2 (27 TeV collision energy) and an integrated luminosity of at least a factor of 3 larger than the HL-LHC. In connection with four experimental detectors, this infrastructure will deepen our understanding of the origin of the electroweak symmetry breaking, allow a first measurement of the Higgs self-coupling, double the HL-LHC discovery reach and allow for in-depth studies of new physics signals arising from future LHC measurements. [...]
CERN-ACC-2019-0006.-
Geneva : CERN, 2019
Fulltext: PDF;
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8.
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Future Circular Collider - European Strategy Update Documents The Hadron Collider (FCC-hh)
/ Benedikt, Michael (CERN) ; Capeans Garrido, Mar (CERN) ; Cerutti, Francesco (CERN) ; Goddard, Brennan (CERN) ; Gutleber, Johannes (CERN) ; Jimenez, Jose Miguel (CERN) ; Mangano, Michelangelo (CERN) ; Mertens, Volker (CERN) ; Osborne, John Andrew (CERN) ; Otto, Thomas (CERN) et al.
This report describes a novel research infrastructure, based on a hadron collider with centre-of-mass collision energy of 100 TeV, collecting an integrated luminosity a factor of 5 or more larger than the HL-LHC. It will extend the current energy frontier by almost an order of magnitude. [...]
CERN-ACC-2019-0005.-
Geneva : CERN, 2019
Fulltext: PDF;
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9.
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Future Circular Collider - European Strategy Update Documents The Integrated Programme (FCC-int)
/ Benedikt, Michael (CERN) ; Blondel, Alain (Universite de Geneve (CH)) ; Brunner, Olivier (CERN) ; Capeans Garrido, Mar (CERN) ; Cerutti, Francesco (CERN) ; Gutleber, Johannes (CERN) ; Goddard, Brennan (CERN) ; Janot, Patrick (CERN) ; Jimenez, Jose Miguel (CERN) ; Klein, Max (University of Liverpool (GB)) et al.
The most effective and comprehensive approach to thoroughly explore the open questions in modern particle physics is a staged research programme, integrating in sequence lepton (FCC-ee) and hadron (FCC-hh) collision programmes, to achieve an exhaustive understanding of the Standard Model and of electroweak symmetry breaking, and to maximize the potential for the discovery of phenomena beyond the Standard Model. The project would rely on a shared and cost effective technical and organizational infrastructure, as was the case with LEP followed by LHC. [...]
CERN-ACC-2019-0007.-
Geneva : CERN, 2019
Fulltext: PDF;
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10.
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Future Circular Collider - European Strategy Update Documents The Lepton Collider (FCC-ee)
/ Benedikt, Michael (CERN) ; Blondel, Alain (Universite de Geneve (CH)) ; Brunner, Olivier (CERN) ; Capeans Garrido, Mar (CERN) ; Cerutti, Francesco (CERN) ; Gutleber, Johannes (CERN) ; Janot, Patrick (CERN) ; Jimenez, Jose Miguel (CERN) ; Mertens, Volker (CERN) ; Milanese, Attilio (CERN) et al.
This report contains the description of a novel research infrastructure based on a highest-luminosity energy frontier electron-positron collider (FCC-ee) to address the open questions of modern physics. It will be a general precision instrument for the continued in-depth exploration of nature at the smallest scales, optimised to study with high precision the Z, W, Higgs and top particles, with samples of 5·10^12 Z bosons, 10^8 W pairs, 10^6 Higgs bosons and 10^6 top quark pairs. [...]
CERN-ACC-2019-0003.-
Geneva : CERN, 2019
Fulltext: PDF;
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