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Projects, Upgrade and Consolidation Projects

Derniers ajouts:
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.
Access to fulltext

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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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2021-01-27
06:31
Chapter 4: RF systems / Calaga, R (CERN) ; Baudrenghien, P (CERN) ; Capatina, Ofelia (CERN) ; Jensen, Erk (CERN) ; Montesinos, Eric (CERN)
The HL-LHC beams are injected, accelerated, and stored to their nominal energy of 7 TeV by the existing 400 MHz superconducting RF system of the LHC. A novel superconducting RF system consisting of eight cavities per beam for transverse deflection (aka crab cavities) of the bunches will be used to compensate the geometric loss in luminosity due to the non-zero crossing angle and the extreme focusing of the bunches in the HL-LHC. Due to doubling of the beam currents in the HL-LHC era, an optimal detuning scheme (aka full- detuning) is required to cope with the transient beam loading effects. A modulation of the klystron and cavity phase make the phase of bunches with respect to the RF clock to progressively slip along the bunch train, but then recover during the abort gap. [...]
2020 - 22 p. - Published in : 10.23731/CYRM-2020-0010.65 Fulltext: PDF;
In : High-Luminosity Large Hadron Collider (HL-LHC): Technical design report, pp.65-86

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2021-01-27
06:31
Chapter 5: Collimation system / Redaelli, Stefano (CERN) ; Bruce, Roderik (CERN) ; Lechner, Anton (CERN) ; Mereghetti, Alessio (CERN)
A variety of processes can cause unavoidable beam losses during normal and abnormal beam operation. Because of the high stored energy of about 700 MJ and the small transverse beam sizes, the HL-LHC beams are highly destructive. [...]
2020 - 27 p. - Published in : 10.23731/CYRM-2020-0010.87 Fulltext: PDF;
In : High-Luminosity Large Hadron Collider (HL-LHC): Technical design report, pp.87-114

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