CERN Accelerating science

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1.
Evaluation of different scaling laws for dynamic aperture variation over time and intensity evolution in hadron storage rings / Montanari, Carlo Emilio
Two proposed fit models for Dynamic Aperture (DA) evolution have been studied in detail and applied to different numerical models and experimental data. [...]
CERN-STUDENTS-Note-2018-131.
- 2018
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2.
Diffusive models and chaos indicators for non-linear betatron motion in circular hadron accelerators / Montanari, Carlo Emilio
Understanding the complex dynamics of beam-halo formation and evo- lution in circular particle accelerators is crucial for the design of current and future rings, particularly those utilizing superconducting magnets such as the CERN Large Hadron Collider (LHC), its luminosity upgrade HL-LHC, and the [...]
CERN-THESIS-2023-091 - 217 p.


10.48676/unibo/amsdottorato/10811
3.
MD 7224: LHC collimation quench test with protons / Hermes, Pascal Dominik (CERN) ; Abramov, Andrey (CERN) ; Bruce, Roderik (CERN) ; Calzolari, Daniele (Universita e INFN, Padova (IT)) ; D'Andrea, Marco (CERN) ; Giovannozzi, Massimo (CERN) ; Hernalsteens, Cedric (CERN) ; Lechner, Anton (CERN) ; Lindstrom, Bjorn Hans Filip (CERN) ; Mirarchi, Daniele (CERN) et al.
This note describes a collimation quench test performed at the CERN Large Hadron Collider. [...]
CERN-ACC-NOTE-2023-0024.
- 2023.
4.
Determination of the Phase-Space Stability Border with Machine Learning Techniques / Van der Veken, Frederik (CERN) ; Akbari, Runa (CERN) ; Bogaert, Michiel (CERN) ; Fol, Elena (CERN) ; Giovannozzi, Massimo (CERN) ; Lowyck, Amy (CERN) ; Montanari, Carlo Emilio (CERN) ; Van Goethem, Wietse (CERN)
The dynamic aperture (DA) of a hadron accelerator is represented by the volume in phase space that exhibits bounded motion, where we disregard any disconnected parts that could be due to stable islands. To estimate DA in numerical simulations, it is customary to sample a set of initial conditions using a polar grid in the transverse planes, featuring a limited number of angles and using evenly distributed radial amplitudes. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 183-186 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.183-186
5.
Using Machine Learning to Improve Dynamic Aperture Estimates / Van der Veken, Frederik F (CERN ; Malta U.) ; Giovannozzi, Massimo (CERN) ; Maclean, Ewen H (CERN ; Malta U.) ; Montanari, Carlo Emilio (Bologna U. ; CERN) ; Valentino, Gianluca (Malta U. ; CERN)
The dynamic aperture (DA) is an important concept in the study of nonlinear beam dynamics. Several analytical models used to describe the evolution of DA as a function of time, and to extrapolate to realistic time scales that would not be reachable otherwise due to computational limitations, have been successfully developed. [...]
JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 134-137 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.134-137
6.
Kinematic Fits to Determine Masses of Supersymmetric Particles at LHC / Schettler, Hannes (Hamburg U.)
In this thesis the method of kinematic fits is applied to determine the masses of supersymmetric particles. This is implemented by a constrained least square fit. [...]
CERN-THESIS-2009-213; CMS-TS-2009-021.- 2009 - 83 p. Fulltext: TS2009_021 - PDF; TS2009_021_2 - PDF;
7.
Collimator Scan Based Beam Halo Measurements in LHC and HL-LHC / Hermes, Pascal (CERN) ; Giovannozzi, Massimo (CERN) ; Montanari, Carlo Emilio (CERN ; U. Manchester (main)) ; Morales Vigo, Sara (CERN ; Cockcroft Inst. Accel. Sci. Tech.) ; Rakic, Milica (Ecole Polytechnique, Lausanne) ; Redaelli, Stefano (CERN) ; Salvachúa, Belen (CERN)
Measurements in the CERN Large Hadron Collider (LHC) have indicated that the population of the transverse beam halo is greater than that of a Gaussian distribution. With the upcoming High Luminosity upgrade (HL-LHC), the stored beam energy in the beam halo could become large enough to threaten the integrity of the collimation system. [...]
2023 - 5 p. - Published in : JACoW IBIC 2023 (2023) 164-168 Fulltext: PDF;
In : 12th International Beam Instrumentation Conference (IBIC 2023), Saskatoon, Canada, 10 - 14 Sep 2023, pp.164-168
8.
Extended-Domain Tune-Scans for the HL-LHC Dynamic Aperture in Presence of Beam-Beam Effects / Kaltchev, Dobrin (TRIUMF) ; Karastathis, Nikolaos (CERN) ; Papaphilippou, Yannis (CERN) ; Pellegrini, Dario (CERN) ; McIntosh, E (CERN)
Simulations of the HL-LHC dynamic aperture (DA) at collision energy and in the presence of beam-beam effects (weak-strong approximation) have been performed to determine the dependence of DA on the working point in tune space. Both linear domains of working points are explored and two-dimensional ones which focus on more promising sub-regions near the diagonal. [...]
CERN-ACC-2018-127.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUPAL064 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAL064
9.
THE PLOUGHSHARE PLATFORM FOR GRID DISTRIBUTION / Patawah, Benard Lawer
Many different PDF fitting groups currently prepare their own fast interpolation grids for calculations at NLO and NNLO in order to quickly reproduce production cross sections for parton interaction processes. [...]
CERN-STUDENTS-Note-2018-149.
- 2018
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10.
DIFFERENCES IN OPTIMIZATION TOWARDS SHAPE-FITS / Alawashra, Mahmoud S A
We studied in this project a different optimization frameworks to maximize the signal exclusion. [...]
CERN-STUDENTS-Note-2018-211.
- 2018
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