CERN Accelerating science

Projects, Upgrade and Consolidation Projects

On the mechanics of MQXFB—the low-beta quadrupole for the HL-LHC / Takala, E (CERN) ; Bianchi, L (CERN) ; Lackner, F (CERN) ; Ferracin, P (LBL, Berkeley) ; Izquierdo Bermudez, S (CERN) ; Pulikowski, D (CERN)
The High Luminosity Large Hadron Collider (LHC) Project target is to reach an integrated luminosity of the LHC of 3000 fb$^{−1}$, corresponding to a factor 10 increase in collisions with respect to the current accelerator. One of the main components is the superconducting quadrupole called MQXF. [...]
2021 - 20 p. - Published in : Supercond. Sci. Technol. 34 (2021) 095002 Fulltext: PDF;

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Design of High-Precision lifting system for the HL-LHC Heavy Components in the interaction region / Micolon, Frederic ; Sosin, Mateusz (CERN)
Given the high radiation level and the tight alignment tolerances, the HL-LHC interaction region components are designed to be realigned remotely using motorized supporting jacks, as human interventions in these zones must be limited to the strict minimum. A position adjustment system will allow a vertical and horizontal displacement of each jack support by at least +/- 2.5 mm with a resolution of less than 10 μm [...]
CERN-ACC-2021-0006.- Geneva : CERN, 2021 - 4 p.
In : 11th International Conference on Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation, Online, Us, Online, 26 - 29 Jul 2021, pp.MEDSI20

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A methodology for the analysis of the three-dimensional mechanical behavior of a Nb$_3$Sn superconducting accelerator magnet during a quench / Ferradas Troitino, J (CERN ; Geneva U.) ; Bajas, H (CERN) ; Bianchi, L (CERN) ; Castaldo, B (CERN) ; Ferracin, P (LBNL, Berkeley) ; Guinchard, M (CERN) ; Izquierdo, S (CERN) ; Lorenzo, J V (Barcelona Supercomputing Ctr.) ; Mangiarotti, F (CERN) ; Perez, J C (CERN) et al.
The fast thermal and electromagnetic transients that occur in a superconducting magnet in case of a quench have the potential of generating large mechanical stresses both in the superconducting coils and in the magnet structure. While the investigation of such quench loads should generally be conducted to ensure a safe operation of the system, its importance is greatly enlarged in the case of high-field magnets based on strain sensitive superconductors. [...]
2021 - 17 p. - Published in : Supercond. Sci. Technol. 34 (2021) 084003 Fulltext: PDF;

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Numerical optimization of dc wire parameters for mitigation of the long range beam-beam interactions in High Luminosity Large Hadron Collider / Skoufaris, K (CERN ; Crete U. ; Unlisted, GR) ; Fartoukh, S (CERN) ; Papaphilippou, Y (CERN) ; Poyet, A (CERN) ; Rossi, A (CERN) ; Sterbini, G (CERN) ; Kaltchev, D (TRIUMF)
Several configurations of the High Luminosity Large Hadron Collider, whose performance at collision is mainly limited due to the strong beam-beam long-range interactions, are studied in the presence of dc wire compensators. This analysis is based on analytical and numerical calculations where the main observables are the dynamic aperture (correlated to the beam lifetime) and the frequency map analysis. [...]
2021 - 16 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 074001 Fulltext: PDF;

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Mechanical Behavior of the Shielded HL-LHC Beam Screen during a Magnet Quench / Morrone, Marco (CERN) ; Garion, Cedric (CERN) ; Chiggiato, Paolo (CERN) ; Sacristan De Frutos, Oscar ; Guinchard, Michael (CERN) ; Fiscarelli, Lucio (CERN)
In the framework of the High-Luminosity Large Hadron Collider (HL-LHC) project, larger and shielded beam screens will be installed in the beam pipe of the superconducting magnets of the insertion next to the ATLAS and CMS detectors. The beam screen is a complex assembly that guarantees the vacuum requirements while shielding the magnet cold mass from the induced heat loads. [...]
CERN-ACC-2021-0005.- Geneva : CERN, 2021 - 24 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 9000616 Fulltext: PDF;

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Development and Coil Fabrication for the LARP 3.7-m Long Nb3Sn Quadrupole / LARP Collaboration
The U.S. LHC Accelerator Research Program (LARP) has started the fabrication of 3.7-m long Nb$_3$Sn quadrupole models. [...]
FERMILAB-PUB-08-459-TD.- 2009 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 1231-1234 Fulltext: PDF; External link: Fermilab Library Server (fulltext available)
In : Applied Superconductivity Conference 2008, Chicago, IL, USA, 17 - 22 Aug 2008, pp.1231-1234

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Development and test of LARP technological quadrupole (TQC) magnet / Feher, S (Fermilab) ; Bossert, R C (Fermilab) ; Ambrosio, G (Fermilab) ; Andreev, N (Fermilab) ; Barzi, E (Fermilab) ; Carcagno, R (Fermilab) ; Kashikhin, V S (Fermilab) ; Kashikhin, V V (Fermilab) ; Lamm, M J (Fermilab) ; Nobrega, F (Fermilab) et al.
In support of the development of a large-aperture superconducting quadrupole for the Large Hadron Collider (LHC) luminosity upgrade, two-layer quadrupole models (TQC and TQS) with 90 mm aperture are being constructed at Fermilab and LBNL within the framework of the US LHC Accelerator Research Program (LARP). This paper describes the construction and test of model TQC01. [...]
FERMILAB-PUB-06-296-TD.- 2007 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 17 (2007) 1126-1129
Fulltext: PDF; External link: Fermilab Library Server (fulltext available)
In : Applied Superconductivity Conference, Seattle, WA, USA, 27 Aug - 1 Sep 2006, pp.1126-1129

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First demonstration of the use of crab cavities on hadron beams / Calaga, R (CERN) ; Alekou, A (Manchester U.) ; Antoniou, F (CERN) ; Appleby, R B (Manchester U.) ; Arnaudon, L (CERN) ; Artoos, K (CERN) ; Arduini, G (CERN) ; Baglin, V (CERN) ; Barriere, S (CERN) ; Bartosik, H (CERN) et al.
Many future particle colliders require beam crabbing to recover geometric luminosity loss from the nonzero crossing angle at the interaction point (IP). A first demonstration experiment of crabbing with hadron beams was successfully carried out with high energy protons. [...]
2021 - 6 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 062001 Fulltext: PDF;

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Proton irradiation effects in Molybdenum-Carbide-Graphite composites / Simos, N (Brookhaven) ; Charitonidis, N (CERN) ; Simon, P (CERN) ; Whitaker, M (Brookhaven ; YITP, Stony Brook) ; Zhong, H (YITP, Stony Brook) ; Ghose, S (Brookhaven) ; Zhong, Z (Brookhaven) ; Quaranta, E (CERN) ; Guardia-Valenzuela, J (CERN) ; Accettura, C (CERN ; Milan Polytechnic) et al.
The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) has prompted the investigation of novel materials for beam-intercepting devices, and in particular for the collimators responsible for protecting the machine from beam losses. The HL-LHC collimation system will inevitably experience increased levels of radiation damage and undergo changes in their crucial physio-mechanical properties. [...]
2021 - 14 p. - Published in : J. Nucl. Mater. 553 (2021) 153049

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Progress in the Development of the Nb$_3$Sn MQXFB Quadrupole for the HiLumi Upgrade of the LHC / Izquierdo Bermudez, Susana (CERN) ; Ambrosio, Giorgio (Fermilab) ; Apollinari, Giorgio (Fermilab) ; Bajko, Marta (CERN) ; Bordini, Bernardo (CERN) ; Bourcey, Nicolas (CERN) ; Duarte Ramos, Delio (CERN) ; Ferracin, Paolo (LBL, Berkeley) ; Fiscarelli, Lucio (CERN) ; Feher, Sandor (Fermilab) et al.
The high-luminosity upgrade of the Large Hadron Collider (HL-LHC) requires new high field and large-aperture quadrupole magnets for the low-beta inner triplets (MQXF). With a nominal operating gradient of 132.2 T/m in a 150 mm aperture and a conductor peak field of 11.3 T, the new quadrupole magnets are based on Nb3Sn superconducting technology. [...]
FERMILAB-PUB-21-126-TD.- 2021 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 4002007 Fulltext: PDF;

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High Luminosity Large Hadron Collider (HL-LHC) (920)
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