CERN Accelerating science


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Extension of Signal Monitoring Applications with Machine Learning / Obermair, Christoph (Graz University of Technology (AT))
The Large Hardron Colider (LHC) is the world’s largest particle accelerator. It is 27-km long and contains a wide range of superconducting circuits for controlling the shape and trajectory of particles. [...]
CERN-THESIS-2020-010.- Graz : Obermair Christoph , 2020-02-28 - 81 p. Fulltext: PDF; External link: Approve this document (restricted)

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Exact Solutions of Indirect Transverse Field Effects in Elongated Structures with Applications to CERN LHC and PS / Hirlander, Simon (University of Malta (MT))
The understanding of the electromagnetic interaction of the particle beam with the surrounding elements - so-called indirect space charge driven (ISCD) effects - in particle accelerators, is crucial for stable high-intensity performance. It is addressed and applied at the CERN accelerator complex. [...]
CERN-THESIS-2020-009.- Fulltext: PDF; External link: Approve this document (restricted)

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SixTrack V and runtime environment / De Maria, R (CERN) ; Andersson, J (CERN) ; Berglyd Olsen, V K (CERN) ; Field, L (CERN) ; Giovannozzi, M (CERN) ; Hermes, P D (CERN) ; Høimyr, N (CERN) ; Kostoglou, S (CERN) ; Iadarola, G (CERN) ; Mcintosh, E (CERN) et al.
SixTrack is a single-particle tracking code for high-energy circular accelerators routinely used at CERN for the Large Hadron Collider (LHC), its luminosity upgrade (HL-LHC), the Future Circular Collider (FCC) and the Super Proton Synchrotron (SPS) simulations. The code is based on a 6D symplectic tracking engine, which is optimized for long-term tracking simulations and delivers fully reproducible results on several platforms. [...]
2020 - 17 p. - Published in : Int. J. Mod. Phys. A 34 (2020) 1942035

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Optics interlock system for the CERN LHC: Implementation and operational experience / Schaumann, M (CERN) ; Calia, A (CERN) ; Fuchsberger, K (CERN) ; Galilée, M A (CERN) ; Hemelsoet, G H (CERN) ; Hostettler, M (CERN) ; Jacquet, D (CERN) ; Makai, J (CERN) ; Wenninger, J (CERN)
In 2016 the luminosity reach of the Large Hadron Collider (LHC) was increased by reducing the β-function in the main collision points below the design value to β*=40  cm. This was possible thanks to a specially matched betatron phase advance between the extraction kickers and some sensitive machine elements that would otherwise risk to be damaged by miskicked beam in case of an asynchronous beam dump. [...]
2020 - 12 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 022801 Fulltext: PDF;

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Lead evaporation instabilities and failure mechanisms of the micro oven at the GTS-LHC ECR ion source at CERN / Kövener, T (CERN ; U. Hamburg (main)) ; Küchler, D (CERN) ; Toivanen, V A (Jyvaskyla U.)
The GTS-LHC ECR ion source (named after the Grenoble Test Source and the Large Hadron Collider) at CERN provides heavy ion beams for the chain of accelerators from Linac3 up to the LHC for high energy collision experiments and to the Super Proton Synchrotron for fixed target experiments. During the standard operation, the oven technique is used to evaporate lead into the source plasma to produce multiple charged lead ion beams. [...]
2020 - 5 p. - Published in : Rev. Sci. Instrum. 91 (2020) 013320

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Analysis of 440 GeV proton beam–matter interaction experiments at the High Radiation Materials test facility at CERN / Burkart, F (Frankfurt U. ; CERN) ; Schmidt, R (CERN) ; Raginel, V (CERN) ; Wollmann, D (CERN) ; Tahir, N A (Darmstadt, GSI) ; Shutov, A (IPCP, Chernogolovka) ; Piriz, A R (Castilla-La Mancha U.)
In a previous paper [Schmidt et al., Phys. Plasmas 21, 080701 (2014)], we presented the first results on beam–matter interaction experiments that were carried out at the High Radiation Materials test facility at CERN. [...]
AIP, 2015 - 9 p. - Published in : J. Appl. Phys. 118 (2015) 055902

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Measurement of $D^0-\overline{D^0}$ mixing parameters and search for $CP$ violation in $D^0 \rightarrow K^+ \pi^-$ decays with LHCb Run 2 data / Ribatti, Roberto (Universita & INFN Pisa (IT))
$D^0-\overline{D^0}$ mixing parameters are measured in the decay-time-dependent ratio of $D^0 \rightarrow K^+ \pi^-$ to $D^0 \rightarrow K^- \pi^+$ rates. The analysis uses a data sample of proton-proton collisions corresponding to an integrated luminosity of $5.9\,\text{fb}^{-1}$ collected by LHCb experiment from 2015 to 2018 at the center-of-mass energy of $13$ TeV. [...]
CERN-THESIS-2019-298.- Fulltext: PDF; External link: Approve this document (restricted)

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Anomaly detection for the injection kickermagnets of the CERN Large HadronCollider / Dewitte, Thiebout Thomas
Reliability, availability and maintainability are parameters that determine if a large-scale accelerator system can be operated in a sustainable and cost effective manner. Beam transfer equipment such as kicker systems are critical components with potential significant impact on the global performance of the entire machine complex [...]
CERN-THESIS-2019-294.- 85 p. Fulltext: PDF; External link: Approve this document (restricted)

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MD4944: Local linear coupling measurement at the IPs / Persson, Tobias Hakan Bjorn (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Hofer, Michael (Vienna University of Technology (AT)) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Tomas Garcia, Rogelio (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES))
It was observed that a large local linear coupling around IP2 reduced the luminosity during the 2018 ion run. [...]
- 2020. - 9 p.

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LHC status and performance / Wenninger, Jorg (CERN)
The CERN Large Hadron Collider operated during Run 2 (2015-2018) at a beam energy of 6.5 TeV. This period saw an important increase in performance through improvements in the LHC and an increased beam quality from its injectors, leading to a peak luminosity that exceeds the LHC design luminosity by more than a factor two. [...]
SISSA, 2018 - 9 p. - Published in : PoS CHARGED2018 (2019) 001 Fulltext: PDF; External link: PoS server
In : 7th workshop on prospects for charged Higgs discovery at colliders, Uppsala, Sweden, 25 - 28 Sep 2018, pp.001

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