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CERN Accelerating science


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Criticality of fast failures in the High Luminosity Large Hadron Collider / Lindstrom, Bjorn Hans Filip (CERN)
Each of the two Large Hadron Collider (LHC) beams contain 362 MJ of energy. This will be further increased to 678 MJ in the upcoming upgrade to the High Luminosity LHC (HL-LHC). [...]
CERN-THESIS-2020-318; urn:nbn:se:uu:diva-426416; ISBN:978-91-513-1081-7;; diva2:1504630.- Uppsala, Sweden : Acta Universitatis Upsaliensis, 2021-01-05 - 115 p. Fulltext: PDF; External link: Approve this document (restricted)

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Local beating corrections with orbit bumps in the LHC / Wolf, Dominik Werner
The purpose of this Master thesis is to explore further possibilities to increase the Luminosity of the Large Hadron Collider (LHC) by improving the optics correction [...]
CERN-THESIS-2021-024 - 104 p.

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First observation of ion beam channeling in bent crystals at multi-TeV energies / Redaelli, S (CERN) ; Butcher, M (CERN) ; Barreto, C (CERN) ; Losito, R (CERN) ; Masi, A (CERN) ; Mirarchi, D (CERN) ; Montesano, S (CERN) ; Rossi, R (CERN ; INFN, Rome ; Rome U.) ; Scandale, W (CERN) ; Serrano Galvez, P (CERN) et al.
Planar channeling in bent crystals has been observed in LHC with multi-TeV proton beam in 2015. Two crystals, mounted on novel high-accuracy goniometers (one in the horizontal and one in the vertical plane), are integrated in the LHC collimation system, for studying the feasibility of the crystal-based collimation scheme. [...]
2021 - 7 p. - Published in : Eur. Phys. J. C 81 (2021) 142

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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. [...]
- 2021. - 7 p.
Fermilab Accepted Manuscript - Fulltext

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Control of large helium cryogenic systems: a case study on CERN LHC / Pezzetti, Marco (CERN)
The CERN cryogenic facilities demand a versatile, distributed, homogeneous and highly reliable control system. For this purpose, CERN conceived and developed several frameworks (JCOP, UNICOS, FESA, CMW), based on current industrial technologies and COTS equipment, such as PC, PLC and SCADA systems complying with the requested constraints. [...]
2021 - 20 p. - Published in : EPJ Tech. Instrum. 8 (2021) 6 Fulltext: PDF;

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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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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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LHC 3324: Counteracting coupling decay at injection, / Persson, Tobias Hakan Bjorn (CERN) ; Maclean, Ewen Hamish (CERN) ; Hulpers, Fredrik ; Solfaroli Camillocci, Matteo (CERN) ; Hofer, Michael (CERN) ; Tomas Garcia, Rogelio (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES))
The b3 spool-pieces are corrector sextupole magnets (MCS), are designed to correct the b3-error of the main dipoles. [...]
- 2021. - 22 p.

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A fiber optic sensors monitoring system for the central beam pipe of the CMS experiment / Fienga, Francesco (CERN ; U. Naples (main) ; INFN, Naples) ; Szillasi, Zoltan (Debrecen, Inst. Nucl. Res.) ; Beni, Noemi (CERN) ; Irace, Andrea (Naples U.) ; Gaddi, Andrea (CERN) ; Zeuner, Wolfram (CERN) ; Ball, Austin (CERN) ; Buontempo, Salvatore (CERN ; INFN, Naples) ; Breglio, Giovanni (CERN ; U. Naples (main) ; INFN, Naples)
In this paper we describe the main characteristics and experimental results, recorded in more than four years of data acquisition, of a temperature and strain monitoring system, called i-pipe, based on Fiber Bragg Grating (FBG) sensors arrays applied for the first time to a sector of the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN): the central beam pipe (BP) of the Compact Muon Solenoid (CMS). The monitoring system, consisting of four arrays of 16 FBG sensors each, as better described in the text, is placed on four directives of the LHC section that passes inside the CMS experiment, namely the CMS central BP. [...]
2019 - 6 p. - Published in : Opt. Laser Technol. 120 (2019) 105650

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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. [...]
- 2021. - 52 p.
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