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Projects, Upgrade and Consolidation Projects

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2021-05-01
06:00
Machine Learning Applied to the Analysis of Nonlinear Beam Dynamics Simulations for the CERN Large Hadron Collider and Its Luminosity Upgrade / Giovannozzi, Massimo (CERN) ; Maclean, Ewen (CERN) ; Montanari, Carlo Emilio (CERN ; Bologna U.) ; Valentino, Gianluca (Malta U.) ; Van der Veken, Frederik F (CERN ; Malta U.)
A Machine Learning approach to scientific problems has been in use in Science and Engineering for decades. High-energy physics provided a natural domain of application of Machine Learning, profiting from these powerful tools for the advanced analysis of data from particle colliders. [...]
2021 - 22 p. - Published in : Information 12 (2021) 53 Fulltext: PDF;

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2021-04-22
12:04
On the mechanisms governing the critical current reduction in Nb$_{3}$Sn Rutherford cables under transverse stress / De Marzi, Gianluca (ENEA, Frascati ; CERN) ; Bordini, Bernardo (CERN) ; Baffari, Dario (CERN)
Within the framework of the HiLumi-LHC project, CERN is currently manufacturing 11 T dipole and quadrupole accelerator magnets using state-of-the-art Nb$_{3}$Sn Rutherford cables. Even higher magnetic fields are considered by the Hadron Future Circular Collider (FCC-hh) design study, which plans to develop 16 T Nb$_{3}$Sn bending dipoles. [...]
2021 - 15 p. - Published in : Sci. Rep. 11 (2021) 7369 Fulltext: PDF;

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2021-04-07
15:36
Sextupole scheme optimization for HL–LHC / Plassard, Fabien ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN)
One essential upgrade of the High Luminosity LHC (HL–LHC) to reach the desired luminosity, is the large reduction of the β-function value at the interaction points (IP) hosting the high-luminosity experiments ATLAS and CMS. [...]
CERN-ACC-NOTE-2021-0012. - 2021.

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2021-03-26
06:13
Achromatic telescopic squeezing scheme and by-products: From concept to validation / Fartoukh, S (CERN) ; Solfaroli, M (CERN) ; De Portugal, J Coello (CERN) ; Mereghetti, A (CERN) ; Poyet, A (CERN) ; Wenninger, J (CERN)
The achromatic telescopic squeezing (ATS) scheme has brought an essential conceptual foundation to the HL-LHC project, making possible a strong and clean (achromatic) reduction of β*, an important parameter with respect to which several HL-LHC sub-systems were dimensioned (e.g., the 150 mm aperture of the new inner triplet quadrupoles) or justified (crab-cavities for mitigating the geometric luminosity loss factor at low β* and subsequent large crossing-angle). The basic mechanics of the scheme is shortly reminded, highlighting as well some of its by-products (Landau damping, long-range beam-beam mitigation with octupoles), and a recent improvement which made possible an early, but still partial, implementation of ATS optics in the LHC for the 2017 and 2018 LHC physics runs. [...]
2021 - 13 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 021002 Fulltext from Publisher: PDF;

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2021-03-26
06:13
Magnetic Field Measurements of First Pre-series Full-Length 4.2 m Quadrupole MQXFA03 Using PCB Rotating Coils for the Hi-Lumi LHC Project / Song, Honghai (Stony Brook U.) ; Ambrosio, Giorgio (Fermilab) ; Amm, Kathleen (Brookhaven) ; Anerella, Michael (Brookhaven) ; Apollinari, Giorgio (Fermilab) ; Cheng, Daniel (LBNL) ; Chlachidze, Guram (Fermilab) ; DiMarco, Joseph (Fermilab) ; Feher, Sandor (Fermilab) ; Ferracin, Paolo (LBNL) et al.
The U.S. Hi-Lumi LHC Accelerator Upgrade Project (AUP) and CERN have joined efforts to develop high field quad-rupoles for the Hi-Lumi LHC upgrade. [...]
FERMILAB-PUB-21-038-TD.- 2021 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 4000207 Fulltext: PDF; External link: Fermilab Accepted Manuscript
In : Applied Superconductivity Conference, Online, 24 Oct - 7 Nov 2020, pp.4000207

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2021-03-19
06:02
A methodology to compute the critical current limit in Nb$_3$Sn magnets / Vallone, G (LBNL, Berkeley) ; Anderssen, E (LBNL, Berkeley) ; Bordini, B (CERN) ; Ferracin, P (LBNL, Berkeley) ; Troitino, J F (CERN) ; Prestemon, S (LBNL, Berkeley)
Numerous experiments have shown that the loads applied to Nb$_3$Sn strands and cables can reduce their critical current. Experiments, performed on uniaxially loaded strands, allowed to define clear laws to describe the evolution of the critical surface as a function of the applied current, field, temperature and strain. [...]
2021 - 13 p. - Published in : Supercond. Sci. Technol. 34 (2021) 025002

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2021-03-18
06:00
Application of the New Generic Quench Detection System for LHC's 11 T Dipole Magnet / Steckert, Jens (CERN) ; Serrano, Daniel Blasco (CERN) ; De Matteis, Ernesto (CERN) ; Denz, Reiner (CERN) ; Haas, Severin (CERN) ; Mundra, Surbhi (CERN) ; Podzorny, Tomasz (CERN) ; Siemko, Andrzej (CERN) ; Spasic, Jelena (CERN)
The high luminosity upgrade of large hadron collider (LHC) introduces a large number of new superconducting elements of various technologies. In order to ensure protection of these elements, a modular, versatile quench detection system had been developed. [...]
2019 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 1-4

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2021-03-03
09:00
Simulation for mitigating dilution kicker high voltage flashover incidents / Loebner, Alina Melaschenko (Aarhus University (DK))
The bachelor’s thesis covers the development of the project “Simulation for mitigating dilution kicker high voltage flashover incidents” made at CERN. [...]
CERN-ACC-NOTE-2021-0007. - 2021. - 52 p.
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2021-01-27
06:31
Chapter 13: Beam instrumentation and long-range beam–beam compensation / Jones, R (CERN) ; Bravin, Enrico (CERN) ; Lefevre, Thibault (CERN) ; Veness, Raymond (CERN)
The extensive array of beam instrumentation with which the LHC is equipped has played a major role in its commissioning, rapid intensity ramp-up and safe and reliable operation. Much of this equipment will need consolidation by the time the LHC enters the High-Luminosity (HL) era, while the upgrade itself brings a number of new challenges. The installation of a completely new final focus system in the two high-luminosity LHC insertions implies the development of new beam position monitors to equip the upgraded quadrupole magnets. [...]
2020 - 14 p. - Published in : 10.23731/CYRM-2020-0010.245 Fulltext: PDF;
In : High-Luminosity Large Hadron Collider (HL-LHC): Technical design report, pp.245-258

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2021-01-27
06:31
Chapter 3: Insertion Magnets / Todesco, E (CERN) ; Ferracin, P (CERN)
In general, magnets will be tested individually in a vertical test station, and then horizontally in the final cold mass assembly within the final cryostat, with the exception of Q2 and D2 whose length does not allow vertical testing. Many power tests will be done in laboratories collaborating with CERN (BNL for vertical test of Q1/Q3, FNAL for horizontal test of Q1/Q3, KEK for vertical test of D1, LASA for vertical test of high order correctors, IMP (Lanzhou-China) for vertical test of D2 correctors, FREIA (Univ. [...]
2020 - 18 p. - Published in : 10.23731/CYRM-2020-0010.47 Fulltext: PDF;
In : High-Luminosity Large Hadron Collider (HL-LHC): Technical design report, pp.47-64

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