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CERN Document Server Encontrados 2,047 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 3.63 segundos. 
1.
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Testing the Global Diffusive Behaviour of Beam-Halo Dynamics at the CERN LHC Using Collimator Scans / Montanari, Carlo Emilio (Bologna U.) ; Bazzani, Armando (Bologna U.) ; Giovannozzi, Massimo (CERN) ; Gorzawski, Arkadiusz (Lund U.) ; Redaelli, Stefano (CERN)
In superconducting circular particle accelerators, controlling beam losses is of paramount importance for ensuring optimal machine performance and an efficient operation. To achieve the required level of understanding of the mechanisms underlying beam losses, models based on global diffusion processes have recently been studied and proposed to investigate the beam-halo dynamics. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 172-175 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.172-175
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Diffusive Models for Nonlinear Beam Dynamics / Montanari, Carlo Emilio (Bologna U. ; CERN) ; Bazzani, Armando (Bologna U.) ; Giovannozzi, Massimo (CERN)
Diffusive models for representing the nonlinear beam dynamics in a circular accelerator ring have been developed in recent years. The novelty of the work presented here with respect to older approaches is that the functional form of the diffusion coefficient is derived from the time stability estimate of the Nekhoroshev theorem. [...]
JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 1976-1979 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1976-1979
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3.
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Using Dynamic Indicators for Probing Single-Particle Stability in Circular Accelerators / Montanari, Carlo Emilio (Bologna U. ; CERN) ; Bazzani, Armando (Bologna U.) ; Giovannozzi, Massimo (CERN) ; Turchetti, Giorgio (Bologna U.)
Computing the long-term behaviour of single-particle motion is a numerically intensive process, as it requires a large number of initial conditions to be tracked for a large number of turns to probe their stability. A possibility to reduce the computational resources required is to provide indicators that can efficiently detect chaotic motion, which are considered precursors to unbounded motion. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 168-171 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.168-171
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4.
(31)
Linear Coupling and Adiabaticity of Emittance Exchange / Capoani, Federico (CERN ; Bologna U.) ; Bazzani, Armando (Bologna U.) ; Giovannozzi, Massimo (CERN) ; Neishtadt, Anatoly I (Moscow, Space Res. Inst. ; Loughborough U.)
In circular accelerators, crossing the coupling resonance induces the exchange of the transverse emittances, provided the process is adiabatic. In this paper, we introduce a theoretical framework to analyze the resonance-crossing process, based on Hamiltonian mechanics, which is capable of explaining all the features of the emittance exchange process..
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 1972-1975 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1972-1975
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5.
(28)
Recent measurements and analyses of the beam-halo dynamics at the CERN LHC using collimator scans / Montanari, C E (Bologna U. ; CERN) ; Bazzani, A (Bologna U.) ; Giovannozzi, M (CERN) ; Hermes, P (CERN) ; Redaelli, S (CERN)
Controlling beam losses is of paramount importance in superconducting particle accelerators, mainly for ensuring optimal machine performance and an efficient operation. Models based on global diffusion processes, in which the form of the diffusion coefficient is the stability-time estimate of the Nekhoroshev theorem, have been studied and proposed to investigate the beam-halo dynamics. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) WEPA022 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPA022
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6.
(28)
Cooling of an Annular Beam by Using Nonlinear Effects / Capoani, Federico (CERN ; Bologna U.) ; Bazzani, Armando (Bologna U.) ; Giovannozzi, Massimo (CERN) ; Tomás García, Rogelio (CERN)
In recent years, nonlinear effects have been used to modify the transverse beam distribution by crossing nonlinear resonances adiabatically. This allows generating transversally split beams, in which the initial single Gaussian is divided into several ones depending on the order and stability type of the resonance used. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 1968-1971 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1968-1971
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7.
(26)
Recent Progress on Nonlinear Beam Manipulations in Circular Accelerators / Bazzani, Armando (U. Bologna (main) ; INFN, Bologna) ; Capoani, Federico (CERN ; U. Bologna (main) ; INFN, Bologna) ; Giovannozzi, Massimo (CERN)
In recent years, transverse beam splitting by crossing a stable resonance has become the operational means to perform MultiTurn Extraction (MTE) from the CERN PS to the SPS. This method delivers the high-intensity proton beams for fixed-target physics at the SPS. [...]
2022 - 7 p. - Published in : JACoW HB 2021 (2022) 52-58 Fulltext: PDF;
In : 64th ICFA Advanced Beam Dynamics Workshop on High Intensity and High Brightness Hadron Beams (HB 2021), Batavia, Illinois, United States, 4 - 9 Oct 2021, pp.52-58
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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
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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
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10.
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Determination of BLM conversion factors for collimators scans / Gorzawski, Arkadiusz (ESS - European Spallation Source (SE)) ; Giovannozzi, Massimo (CERN)
This note summarises the results of a study related to a method used to obtain the conversion factor to calibrate in protons/s the signals measured in Gy/s by the BLM system during the collimator scans. [...]
CERN-ACC-NOTE-2022-0077. - 2022. - 9 p.
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