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Projects, Upgrade and Consolidation Projects

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2022-07-01
13:40
Measurement of Excess Noise in Thin Film and Metal Foil Resistor Networks / Beev, Nikolai (CERN)
Low-frequency resistance fluctuations cause excess noise in biased resistors. [...]
CERN-ACC-2022-0010. - 2022.

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2022-07-01
13:34
A Metrology-grade Digitizer for Power Converters in the High Luminosity Large Hadron Collider / Beev, Nikolai (CERN) ; Cerqueira Bastos, Miguel (CERN) ; Martino, Michele (CERN) ; Valuch, Daniel (CERN)
The High Luminosity Large Hadron Collider project at CERN requires performance improvements in the precision powering of magnets, in particular for the new Nb3Sn based Inner Triplet magnets that provide the final focusing of the hadron beams at the interaction points of the ATLAS and CMS detectors. [...]
CERN-ACC-2022-0009. - 2022.

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2022-06-02
06:29
Quench Behavior of Prototype Nb-Ti HL-LHC Dipole Canted Cos-Theta Orbit Corrector Magnets / Wozniak, Mariusz (CERN) ; Ravaioli, Emmanuele (CERN) ; Mangiarotti, Franco (CERN) ; Mentink, Matthias (CERN) ; Kirby, Glyn (CERN) ; Verweij, Arjan (CERN) ; Xu, Qingjin (CAS, Beijing) ; Wu, Wei (CAS, Beijing)
The HL-LHC project is an upgrade of the LHC that requires double aperture dipole correctors. In 2015, CERN selected Canted Cos-Theta (CCT) magnet, and the development of the MCBRD magnets followed. [...]
2022 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 32 (2022) 1-5 Fulltext: PDF;

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2022-06-02
06:29
Mechanical and thermal design of the target neutral beam absorber for the High-Luminosity LHC upgrade / Santos Díaz, P (Natl. U. Sci. Tech., Moscow) ; Sanchez Galan, F (CERN) ; De Maria, R (CERN) ; Kepes, E (Unlisted, CZ) ; Steinberg, P (Brookhaven Natl. Lab.) ; Longo, R (Illinois U., Urbana) ; Mazzoni, S (CERN) ; Cerutti, F (CERN) ; Sabate Gilarte, M (Seville U.) ; Infantino, A (CERN) et al.
The High-Luminosity target neutral beam absorber (TAXN) is the radiation absorber of the neutral particle debris generated at the beam collisions carried out in the ATLAS and CMS detectors at the Large Hadron Collider (LHC). The new absorber will protect the superconducting magnets from this radiation to prevent their quenching at a design luminosity of 7.5×1034  cm−2 s−1. [...]
2022 - 17 p. - Published in : Phys. Rev. Accel. Beams 25 (2022) 053001 Fulltext: PDF;

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2022-06-02
06:29
Luminosity and physics considerations on HL-LHC–and HE-LHC–based $\mu$p colliders / Kaya, Umit (Unlisted, TR) ; Ketenoglu, Bora (Ankara U.) ; Sultansoy, Saleh (TOBB ETU, Ankara) ; Zimmermann, Frank (CERN)
Construction of the future muon collider tangential to the Large Hadron Collider will give opportunity to realize μp collisions at multi-TeV center-of-mass energies. Using the nominal parameters of high-luminosity and high-energy upgrades of the LHC, as well as the design parameters of muon colliders, it is shown that L $_{μp}$ of the order of 10$^{33}$ cm$^{−2}$s$^{−1}$ is achievable for different options with from 4.58 TeV to 12.7 TeV. [...]
2022 - 5 p. - Published in : EPL 138 (2022) 24002

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2022-05-17
20:50
Optimization of the High Order Correctors for HL-LHC Toward the Series Production / Statera, Marco (INFN, Milan) ; Alessandria, Franco (INFN, Milan ; Milan U.) ; Bellomo, Giovanni (INFN, Milan ; Milan U.) ; Broggi, Francesco (INFN, Milan) ; Imeri, Luca (INFN, Milan) ; Leone, Augusto (INFN, Milan) ; Mariotto, Samuele (INFN, Milan ; Milan U.) ; Paccalini, Antonio (INFN, Milan) ; Pasini, Alessandro (INFN, Milan) ; Pedrini, Danilo (INFN, Milan) et al.
INFN is developing at the LASA lab (Milano, Italy) the High Order (HO) corrector magnets for the High Luminosity-LHC (HL-LHC) project, which will equip the interaction regions. Five prototypes, from skew quadrupole to dodecapole, have been designed and tested at LASA. [...]
2021 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 1-5

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2022-05-05
15:29
Optics Measurement and Correction Strategies for HL-LHC / Buffat, Xavier (CERN) ; Carlier, Felix Simon (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; De Maria, Riccardo (CERN) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Fol, Elena (CERN) ; Fuster Martinez, Nuria ; Gamba, Davide (CERN) ; Garcia Morales, Hector ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) et al.
The baseline strategy for optics commissioning in the HL-LHC era is presented and reviewed in detail, along with recent developments and unsolved matters in the linear and nonlinear optics measurement and correction techniques..
CERN-ACC-2022-0004. - 2022. - 102 p.

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2022-04-19
14:45
Magnetic measurements of MCBC and MCBY orbit correctors under special cycling conditions / Chmielinska, Agnieszka (CERN) ; Fiscarelli, Lucio (CERN) ; Todesco, Ezio (CERN) ; Kozanecki, Witold (Université Paris-Saclay (FR))
In the LHC, in addition to normal beam operation, the MCBC and MCBY orbit-corrector magnets are used for deflecting the beam during the van der Meer (vdM) scans used for calibrating the absolute luminosity scale. [...]
CERN-ACC-NOTE-2022-0013. - 2022. - 28 p.
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2022-04-07
06:02
Induction-Coil Measurement System for Normal- and Superconducting Solenoids / Petrone, Carlo (CERN) ; Sorti, Stefano (CERN) ; Dalane, Eivind (CERN) ; Mehl, Bertrand (CERN) ; Russenschuck, Stephan (CERN)
The magnetic measurement of solenoids relies on different methods to characterize the field quality and locate the magnetic axis. Usually, Hall mappers and stretched-wire systems are used for these tasks. [...]
2022 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 32 (2022) 9000605 Fulltext: PDF;

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2022-04-07
06:02
Assembly and Pre-Loading Specifications for the Series Production of the Nb$_3$Sn MQXFA Quadrupole Magnets for the HL-LHC / Ferracin, P (LBL, Berkeley) ; Ambrosio, G (Fermilab) ; Cheng, D W (LBL, Berkeley) ; Ferradas Troitino, J (CERN) ; Garcia Fajardo, L (LBL, Berkeley) ; Izquierdo Bermudez, S (CERN) ; Prestemon, S (LBL, Berkeley) ; Ray, K L (LBL, Berkeley) ; Solis, M J (LBL, Berkeley) ; Todesco, E (CERN) et al.
The High Luminosity LHC (HL-LHC) Project is planning to install 16 cold-masses made with Nb3Sn quadrupole magnets in the LHC Interaction Regions to significantly increase its luminosity. Half of these cold masses are fabricated at BNL, FNAL, and LBNL under the US Accelerator Research Program (AUP). [...]
2022 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 32 (2022) 4000306

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