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CERN Document Server 2,051 notices trouvées  1 - 10suivantfin  aller vers la notice: La recherche a duré 0.90 secondes. 
1.
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Innovative method to measure the extent of the stable phase-space region of proton synchrotrons / Maclean, E H (Malta U. ; CERN) ; Giovannozzi, M (CERN) ; Appleby, R B (Manchester U.)
The advent of circular accelerators based on superconducting magnets has revolutionized the field of beam dynamics, with particle motion turning from linear to nonlinear due to unavoidable high-order field errors generated by the ring magnets. Nonlinear dynamics was already well mastered, e.g., in the close field of celestial mechanics as similar problems had been considered and successfully tackled. [...]
2019 - 8 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 034002 Fulltext from Publisher: PDF;
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Numerical investigation of space charge effects on the positions of beamlets for transversely split beams / Giovannozzi, M (CERN) ; Prior, C (Rutherford) ; Gilardoni, S (CERN) ; Huschauer, A (CERN) ; Hirlander, S (CERN ; Vienna, Tech. U.) ; Machida, S (Rutherford)
The use of transversely split beams was proposed some years ago as a means to perform extraction from a circular particle accelerator over multiple turns. In the course of studies carried out to increase understanding of the beam behavior, space charge effects have been probed. [...]
2017 - 11 p. - Published in : Phys. Rev. Accel. Beams 20 (2017) 121001 Fulltext: PDF;
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3.
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Advancing the CERN proton synchrotron multiturn extraction towards the high-intensity proton beams frontier / Huschauer, A (CERN) ; Bartosik, H (CERN) ; Cettour Cave, S (CERN) ; Coly, M (CERN) ; Cotte, D (CERN) ; Damerau, H (CERN) ; Di Giovanni, G P (CERN) ; Gilardoni, S (CERN) ; Giovannozzi, M (CERN) ; Kain, V (CERN) et al.
Complementary to the physics research at the LHC, several fixed-target facilities receive beams from the LHC injector complex. To serve the fixed-target physics programme at the super proton synchrotron, high-intensity proton beams from the proton synchrotron are extracted using the multiturn extraction technique based on trapping parts of the beam in stable resonance islands. [...]
2019 - 13 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 104002 Fulltext: PDF;
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4.
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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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Ensemble Reservoir Computing for Dynamical Systems: Prediction of Phase-Space Stable Region for Hadron Storage Rings / Casanova, Maxime (IRFU, Saclay, DACM ; Milan U., Math. Dept.) ; Dalena, Barbara (IRFU, Saclay, DACM) ; Bonaventura, Luca (Milan U., Math. Dept.) ; Giovannozzi, Massimo (CERN)
We investigate the ability of an ensemble reservoir computing approach to predict the long-term behaviour of the phase-space region in which the motion of charged particles in hadron storage rings is bounded, the so-called dynamic aperture. Currently, the calculation of the phase-space stability region of hadron storage rings is performed through direct computer simulations, which are resource- and time-intensive processes. [...]
arXiv:2301.06786.- 2023-06-23 - 32 p. - Published in : Eur. Phys. J. Plus 138 (2023) 559 Fulltext: document - PDF; 2301.06786 - PDF;
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6.
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Advances on the modelling of the time evolution of dynamic aperture of hadron circular accelerators / Bazzani, A. (Bologna U. ; INFN, Bologna) ; Giovannozzi, M. (CERN) ; Maclean, E.H. (CERN ; Malta U.) ; Montanari, C.E. (Bologna U. ; INFN, Bologna) ; Van der Veken, F.F. (CERN ; Malta U.) ; Van Goethem, W. (CERN ; Antwerp U.)
Determining a model for the time scaling of the dynamic aperture of a circular accelerator is a topic of strong interest and intense research efforts in accelerator physics. The motivation arises in the possibility of finding a method to reliably extrapolate the results of numerical simulations well beyond what is currently possible in terms of CPU time. [...]
arXiv:1909.09516.- 2019-10-25 - 18 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 104003 Fulltext: PhysRevAccelBeams.22.104003 - PDF; 1909.09516 - PDF; Fulltext from Publisher: PDF;
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7.
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Scaling Laws for the Time Dependence of Luminosity in Hadron Circular Accelerators based on Simple Models of Dynamic Aperture Evolution / Van der Veken, Frederik (CERN) ; Giovannozzi, Massimo (CERN)
In recent years, models for the time-evolution of the dynamic aperture have been proposed and applied to the analysis of non-linear betatronic motion in circular accelerators. In this paper, these models are used to derive scaling laws for the luminosity evolution and are applied to the analysis of the data collected during the LHC physics runs. [...]
2018 - 6 p. - Published in : 10.18429/JACoW-HB2018-WEP2PO002 Fulltext: PDF;
In : 61st ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Daejeon, Korea, 17 - 22 Jun 2018, pp.WEP2PO002
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8.
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Effect of Linear Coupling on Nonlinear Observables at the LHC / Maclean, Ewen (CERN) ; Carlier, Felix (CERN) ; Giovannozzi, Massimo (CERN) ; Persson, Tobias (CERN) ; Tomás, Rogelio (CERN)
Simulation work during LHC Run 1 established that linear coupling had a large impact on nonlinear observables such amplitude detuning and dynamic aperture. It is generally taken to be the largest single source of uncertainty in the modelling of the LHC's nonlinear single particle dynamics. [...]
CERN-ACC-2017-167.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-WEPIK092 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPIK092
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9.
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Hamiltonian theory of the crossing of the $2 Q_x -2 Q_y=0$ nonlinear coupling resonance / Bazzani, A. (U. Bologna, DIFA ; INFN, Bologna) ; Capoani, F. (U. Bologna, DIFA ; INFN, Bologna ; CERN) ; Giovannozzi, M. (CERN)
In a recent paper, the adiabatic theory of Hamiltonian systems was successfully applied to study the crossing of the linear coupling resonance, $Q_x-Q_y=0$. A detailed explanation of the well-known phenomena that occur during the resonance-crossing process, such as emittance exchange and its dependence on the adiabaticity of the process was obtained. [...]
arXiv:2208.11519.- 2022-10-03 - 21 p. - Published in : Phys. Rev. Accel. Beams 25 (2022) 104001 Fulltext: 2208.11519 - PDF; Publication - PDF;
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10.
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Fixed Points in Presence of Space Charge in Circular Particle Accelerators / Giovannozzi, Massimo (CERN) ; Gilardoni, Simone (CERN) ; Huschauer, Alexander (CERN) ; Machida, Shinji (Rutherford) ; Prior, Christopher (Rutherford) ; Sheehy, Suzanne (Rutherford)
Recent measurements performed in the framework of the multi-turn extraction (MTE) studies showed a dependence of the position of beamlets obtained by crossing a stable transverse resonance on the total beam intensity. This novel observation has triggered a number of studies aiming at understanding the source of the observed effect. [...]
CERN-ACC-2015-339.- 2015 - 3 p. - Published in : (2015) , pp. MOPJE045 Published version from JACoW: PDF; External link: JACOW
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.MOPJE045
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