CERN Accelerating science

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2020-05-27
10:57
A linear Framework for Orbit Correction in the High-Luminosity Large Hadron Collider / Andersson, Joel Daniel (Lund University (SE))
In a circular accelerator the closed orbit can be viewed as the mean position of particles in a beam. The closed orbit is perturbed by machine errors and can be manipulated by dedicated corrector magnets. [...]
CERN-THESIS-2019-349.- 113 p. Fulltext: PDF; External link: Approve this document (restricted)

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2020-05-26
14:26
Groomed jet substructure measurements of charm jets tagged with $\rm{D}^{0}$ mesons in pp collisions at $\sqrt{s}$ = 13 TeV /ALICE Collaboration
The ALICE collaboration at the CERN LHC reports the first measurements of groomed jet substructure observables for jets containing a fully reconstructed D^{0} in pp collisions at √s = 13 TeV. Iterative declustering techniques access the jet splitting tree of track-based jets, with grooming techniques isolating the perturbative branches. [...]
ALICE-PUBLIC-2020-002.- Geneva : CERN, 2020 - 14.

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2020-05-13
07:06
Probing LHC halo dynamics using collimator loss rates at 6.5 TeV / Gorzawski, A (CERN ; Malta U.) ; Appleby, R B (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Giovannozzi, M (CERN) ; Mereghetti, A (CERN) ; Mirarchi, D (CERN) ; Redaelli, S (CERN) ; Salvachua, B (CERN) ; Stancari, G (Fermilab) ; Valentino, G (Malta U.) ; Wagner, J F (CERN ; CERN ; Frankfurt U.)
Halo diffusion measurements at the CERN Large Hadron Collider (LHC) were conducted with beams for physics at 6.5 TeV by means of collimator scans, carried out between 2016 and 2018. From the time evolution of the beam losses recorded during a collimator scan, in which collimator jaws are moved in steps toward the beam core cutting beam tails, one can extract information on the halo diffusion and its population as a function of the transverse amplitude. [...]
2020 - 14 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 044802 Fulltext from Publisher: PDF;

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2020-05-13
07:06
Optics-measurement-based beam position monitor calibrations in the LHC insertion regions / García-Tabarés Valdivieso, A (CERN) ; Tomás, R (CERN)
Accurate measurements of optics functions, β, α, D, are essential for proper operation of a synchrotron both for machine protection and for performance. β functions can be obtained from different observables: phase and amplitude of the transverse betatron oscillations and change of the tune by modulating the current of quadrupoles (K-modulation). [...]
2020 - 15 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 042801 Fulltext from Publisher: PDF;

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2020-04-26
06:50
Selection of Wires for the New Generation of Fast Wire Scanners at CERN / Mariet, Alexandre (CERN) ; Veness, Raymond (CERN)
A new generation of fast wire scanners is being produced as part of the LHC Injector Upgrade (LIU) project at CERN. The LIU beam parameters imply that these wire scanners will need to operate with significantly brighter beams. [...]
JACoW, 2019 - 4 p. - Published in : 10.18429/JACoW-IBIC2018-WEPC19 Fulltext: PDF;
In : 7th International Beam Instrumentation Conference, Shanghai, China, 9 - 13 Sep, 2018, pp.WEPC19

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2020-04-26
06:50
Development of a Beam-Gas Curtain Profile Monitor for the High Luminosity Upgrade of the LHC / Veness, Raymond (CERN) ; Ady, Marton (CERN) ; Chritin, Nicolas (CERN) ; Forck, Peter (Darmstadt, GSI) ; Glutting, Johanna (CERN) ; Jones, Owain Rhodri (CERN) ; Kersevan, Roberto (CERN) ; Marriott-Dodington, Thomas (CERN) ; Mazzoni, Stefano (CERN) ; Rossi, Adriana (CERN) et al.
High luminosity upgrades to the LHC at CERN and future energy frontier machines will require a new generation of minimally invasive profile measurement instruments. Production of a dense, focussed gas target allows beam-gas fluorescence to be exploited as an observable, giving an instrument suitable for installation even in regions of high magnetic field. [...]
JACoW, 2019 - 5 p. - Published in : 10.18429/JACoW-IBIC2018-WEPB16 Published fulltext: PDF;
In : 7th International Beam Instrumentation Conference, Shanghai, China, 9 - 13 Sep, 2018, pp.WEPB16

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2020-04-26
06:50
Beam-Gas Imaging Measurements at LHCb / Coombs, George (CERN) ; Ferro-Luzzi, Massimiliano (CERN) ; Matev, Rosen (CERN) /the LHCb Collaboration
The LHCb detector is one of the four large particle physics experiments situated around the LHC ring. The excellent spatial resolution of the experiment’s vertex locator (VELO) and tracking system allows the accurate reconstruction of interactions between the LHC beam and either residual or injected gas molecules. [...]
JACoW, 2019 - 5 p. - Published in : 10.18429/JACoW-IBIC2018-WEPB13 Published fulltext: PDF;
In : 7th International Beam Instrumentation Conference, Shanghai, China, 9 - 13 Sep, 2018, pp.WEPB13

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2020-04-26
06:50
Adaptive Collimator Design for Future Particle Accelerators / Furness, Thomas (Huddersfield U.) ; Bertarelli, Alessandro (CERN) ; Carra, Federico (CERN) ; Fletcher, Simon (Huddersfield U.) ; Gentini, Luca (CERN) ; Pasquali, Michele (CERN) ; Redaelli, Stefano (CERN) ; Williamson, James (Huddersfield U.)
The function of collimators in the LHC is to control and safely dispose of the halo particles that are produced by unavoidable beam losses from the circulating beam. Even tiny proportions of the 7TeV beam have the stored energy to quench the superconducting magnets or damage parts of the accelerator if left unchecked. [...]
JACoW, 2019 - 5 p. - Published in : 10.18429/JACoW-IBIC2018-TUPA15 Published fulltext: PDF;
In : 7th International Beam Instrumentation Conference, Shanghai, China, 9 - 13 Sep, 2018, pp.TUPA15

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2020-04-26
06:50
Optics Measurements in Storage Rings: Simultaneous 3-Dimensional Beam Excitation and Novel Harmonic Analysis / Malina, Lukas (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Dilly, Joschua (CERN) ; Skowroński, Piotr (CERN) ; Tomás, Rogelio (CERN)
Optics measurements in storage rings employ turn-by-turn data of transversely excited beams. Chromatic parameters need measurements to be repeated at different beam energies, which is time-consuming. [...]
JACoW, 2019 - 5 p. - Published in : 10.18429/JACoW-IBIC2018-TUOB02 Published fulltext: PDF;
In : 7th International Beam Instrumentation Conference, Shanghai, China, 9 - 13 Sep, 2018, pp.TUOB02

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2020-04-23
12:55
Propagation of the 50 Hz Perturbations in the Large Hadron Collider Sector Dipoles and Equivalent Model Circuit. / Intelisano, Leandro
Observations of harmonics of the mains power frequency in the beam spectrum have been observed in the past in several accelerators [...]
CERN-THESIS-2020-026 - 94 p.

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