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Projects, Upgrade and Consolidation Projects

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2018-05-31
13:49
Crab Cavity effects on transverse distribution evolution and tail cleaning in the HL-LHC / Baudrenghien, Philippe (CERN) ; Mastoridis, Themistoklis (California Polytechnic State Univ. (US)) ; Steeper, S (California Polytechnic State Univ. (US)) ; Tucker, D (California Polytechnic State Univ. (US)) ; Wieker, Devin (California Polytechnic State Univ. (US))
This work presents the transverse action and tune distribution evolution as a function of the Crab Cavity RF noise Power Spectral Density (PSD). [...]
CERN-ACC-NOTE-2018-0042. - 2018. - 10 p.
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2018-05-22
11:55
LHCb Upgrades and operation at 1034 cm-2 s-1 luminosity –A first study / Efthymiopoulos, Ilias (CERN) ; Arduini, Gianluigi (CERN) ; Baglin, Vincent (CERN) ; Burkhardt, Helmut (CERN) ; Cerutti, Francesco (CERN) ; Claudet, Serge (CERN) ; Di Girolamo, Beniamino (CERN) ; De Maria, Riccardo (CERN) ; Esposito, Luigi Salvatore (CERN) ; Karastathis, Nikos (CERN) et al.
Presently, the LHCb experiment at IP8 operates at reduced luminosity (~4.0 1032 cm-2 s-1) compared to ATLAS and CMS experiments. [...]
CERN-ACC-NOTE-2018-0038. - 2018.

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2018-02-21
12:14
Beam-induced heat loads on the beam screens of the inner triplets for the HL-LHC / Skripka, Galina (CERN) ; Iadarola, Giovanni (CERN)
The expected heat load induced on the beam screens has been evaluated for the triplet assemblies in the four experimental Insertion Regions (IRs) of the HL-LHC [...]
CERN-ACC-NOTE-2018-0009. - 2018. - 50 p.
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2018-01-25
13:18
Effective pile-up density as a measure of the experimental data quality for High-Luminosity LHC operational scenarios. / Medina Medrano, Luis Eduardo (CERN) ; Tomas Garcia, Rogelio (CERN) ; Arduini, Gianluigi (CERN) ; Napsuciale, Mauro (Universidad de Guanajuato)
The High-Luminosity LHC (HL-LHC) experiments will operate at unprecedented level of event pile-up from proton-proton collisions at 14TeV center-of-mass energy [...]
CERN-ACC-2018-0003. - 2018. - 26 p.
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2017-12-21
09:43
Beam dynamics requirements for HL–LHC electrical circuits / Gamba, Davide (CERN) ; Arduini, Gianluigi (CERN) ; Cerqueira Bastos, Miguel (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Martino, Michele (CERN) ; Tomas Garcia, Rogelio (CERN)
A certain number of LHC magnets and relative electrical circuits will be replaced for the HL-LHC upgrade. [...]
CERN-ACC-2017-0101. - 2017. - 47 p.
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2017-10-18
06:37
Improved Protection of the Warm Magnets of the LHC Betatron Cleaning Insertion / Bahamonde Castro, Cristina (CERN) ; Cerutti, Francesco (CERN) ; Fessia, Paolo (CERN) ; Lechner, Anton (CERN) ; Mereghetti, Alessio (CERN) ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN) ; Skordis, Eleftherios (U. Liverpool (main) ; CERN)
After the High Luminosity (HL) upgrade in 2024-2026, the LHC is anticipated to increase its integrated luminosity by a factor of 10 beyond its original design value of 300 fb-1. In preparation for this, several improvements to the equipment will already be implemented during the next Long Shutdown (LS2) starting in 2019. [...]
CERN-ACC-2017-120.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-MOPAB004 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPAB004

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2017-10-18
06:36
Studies on Luminous Region, Pile-up and Performance for HL-LHC Scenarios / Medina Medrano, Luis (CERN ; Unlisted, MX) ; Arduini, Gianluigi (CERN) ; Tomás, Rogelio (CERN)
Studies on luminous region and pile-up density are of great interest for the experiments at the future High Luminosity LHC (HL-LHC) in order to optimize the detector performance. The evolution of these parameters at the two main interaction points of the HL-LHC along optimum physics fills is studied for the baseline and alternative operational scenarios with the latest set of parameters, including a refined description of the longitudinal bunch profile. [...]
CERN-ACC-2017-135.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPIK089 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPIK089

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2017-10-18
06:36
HL-LHC Alignment Requirements and Associated Solutions / Mainaud Durand, Helene (CERN) ; Bartolome-Jimenez, Sonia (CERN) ; Dijoud, Thibault (CERN) ; Duquenne, Mathieu (ESGT, Le Mans) ; Herty, Andreas (CERN) ; Rude, Vivien (ESGT, Le Mans) ; Sosin, Mateusz (CERN)
To increase by more than 10 times the luminosity reach w.r.t the first 10 years of the LHC lifetime, the HL-LHC project will replace nearly 1.2 km of the accelerator during the Long Shutdown 3 scheduled in 2024 [1][2][3]. This paper presents the HL-LHC alignment and internal metrology requirements of all the new components to be installed, from the magnet components to the beam instrumentation and vacuum devices. [...]
CERN-ACC-2017-138.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPIK085 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPIK085

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2017-10-18
06:36
Radiation Levels at the LHC: 2012, 2015 and 2016 Proton Physics Operations in View of HL-LHC requirements / Martinella, Corinna (CERN) ; Brugger, Markus (CERN) ; Danzeca, Salvatore (CERN) ; Garcia Alia, Ruben (CERN) ; Kadi, Yacine (CERN) ; Stein, Oliver (CERN) ; Xu, Chen (CERN)
The variety of beam losses produced in the Large Hadron Collider (LHC) creates a mixed and complex radiation field. During 2012, 2015 and 2016, Beam Loss Monitors and RadMons were used to monitor the inte-grated dose and the High Energy Hadrons fluence in order to anticipate the electronics degradation and inves-tigate the cause of failures. [...]
CERN-ACC-2017-142.- 2017 - 3 p. - Published in : 10.18429/JACoW-IPAC2017-TUPVA015 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA015

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2017-10-18
06:36
Lessons Learnt from the 2016 LHC Run and Prospects for HL-LHC Availability / Apollonio, Andrea (CERN) ; Rey Orozko, Odei (CERN) ; Schmidt, Ruediger (CERN) ; Valette, Matthieu (CERN) ; Wollmann, Daniel (CERN) ; Zerlauth, Markus (CERN)
The LHC exhibited unprecedented availability during the 2016 proton run, producing about 40 fb-1 of integrated luminosity, surpassing the sum of production during the 4 previous years. This was achieved while running steadily with a peak luminosity above the design target of 1034 cm- 2s^{−1}. [...]
CERN-ACC-2017-145.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPVA006 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA006

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