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CERN Document Server 2,050 のレコードが見つかりました。  1 - 10次最後  レコードへジャンプ： 検索にかかった時間： 0.18 秒 
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Could synchrotron light sources benefit from the experience at CERN with beams split in horizontal phase space? / Giovannozzi, Massimo (CERN) ; Carmignani, Nicola (ESRF, Grenoble) ; Franchi, Andrea (ESRF, Grenoble)
This article reviews the recent activities carried out at CERN in terms of transverse beam splitting with proton beams. Thanks to intense experimental and theoretical activities, the recently-proposed approach of splitting beams in the horizontal phase space using stable islands moved out of the test stage and it became a mature technique of beam manipulation to perform multi-turn extraction. [...]
WSP, 2019 - 17 p. - Published in : 10.1142/9789813279612_0025
In : Nonlinear Dynamics and Collective Effects in Particle Beam Physics, Arcidosso, Italy, 19 - 22 Sep 2017, pp.298-314
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Diffusion in stochastically perturbed Hamiltonian systems with applications to the recent LHC dynamic aperture experiments / Bazzani, Armando (INFN, Bologna ; U. Bologna, DIFA) ; Mazzarisi, Onofrio (Salerno U.) ; Giovannozzi, Massimo (CERN) ; Maclean, Ewen (CERN)
In this paper, we review diffusion phenomena in stochastically perturbed Hamiltonian systems, with the aim of defining the framework to use Nekhoroshev-like estimates as prototypes for the form of the diffusion coefficient. A discussion of the features of this framework is carried out. [...]
WSP, 2019 - 16 p. - Published in : 10.1142/9789813279612_0005
In : Nonlinear Dynamics and Collective Effects in Particle Beam Physics, Arcidosso, Italy, 19 - 22 Sep 2017, pp.70-85
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Comparison of Optics Measurement Methods in ESRF / Malina, Lukas (CERN ; U. Oslo (main)) ; Coello de Portugal, Jaime Maria (CERN) ; Farvacque, Laurent (ESRF, Grenoble) ; Franchi, Andrea (ESRF, Grenoble) ; Langner, Andy (CERN) ; Persson, Tobias (CERN) ; Skowroński, Piotr (CERN) ; Tomás, Rogelio (CERN)
The N-BPM and the Amplitude methods, which are used in the LHC for beam optics measurement, were applied to the ESRF storage ring. We compare the results to the Orbit Response Matrix (ORM) method that is routinely used in the ESRF. [...]
CERN-ACC-2016-184.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPMB045 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMB045
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A novel non-adiabatic approach to transition crossing in a circular hadron accelerator / Giovannozzi, M. (CERN) ; Huang, L. (CAS, Beijing) ; Huschauer, A. (CERN) ; Franchi, A. (ESRF, Grenoble)
Crossing the transition energy is always a delicate process, representing a potential source of strong perturbations of the dynamics of charged particle beams in a hadron circular accelerator. Since the first generation of multi-GeV rings, intense studies have been devoted to understanding the possible harmful mechanisms involved in transition crossing and to devise mitigation measures. [...]
arXiv:2109.00387.- 2021-11-29 - Published in : Eur. Phys. J. Plus 136 (2021) 1189 Fulltext: 2109.00387 - PDF; document - PDF;
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Review of Linear Optics Measurements and Corrections in Accelerators / Tomás, Rogelio (CERN) ; Aiba, Masamitsu (PSI, Villigen) ; Franchi, Andrea (ESRF, Grenoble) ; Iriso, Ubaldo (CELLS - ALBA, LLS)
The measurement and correction of optics parameters has been a major concern since the advent of strong focusing synchrotron accelerators. Traditionally, colliders have led the development of methods for optics control based on turn-by-turn centroid data, while lepton storage rings have focused on closed orbit response techniques. [...]
IPAC-2016-MOYCA01; CERN-ACC-2016-321.- 2016 - 7 p. - Published in : 10.18429/JACoW-IPAC2016-MOYCA01 Published version from JACoW: PDF; External link: JACoW
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.MOYCA01
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Split or unsplit electron beams? / Franchi, Andrea (ESRF, Grenoble) ; Giovannozzi, Massimo (CERN)
Non-linear effects have become increasingly relevant in modern circular particle accelerators, and in recent years a change of paradigm has appeared, the attitude towards nonlinear effects having shifted from fighting them to exploiting them with the goal of devising new beam manipulations, such as the splitting of the beam in the transverse phase space by crossing a stable resonance. [...]
arXiv:2202.04864. - 20 p.
Fulltext
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Description of the luminosity evolution for the CERN LHC including dynamic aperture effects. Part I: the model / Giovannozzi, Massimo (CERN) ; Van der Veken, Frederik F. (CERN)
In recent years, modelling the evolution of beam losses in circular proton machines starting from the evolution of the dynamic aperture has been the focus of intense research. Results from single-particle, non-linear beam dynamics have been used to build simple models that proved to be in good agreement with beam measurements. [...]
arXiv:1806.03058.- 2018-10-11 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 905 (2018) 171-179 Fulltext: 10.1016_j.nima.2018.07.063 - PDF; 1806.03058 - PDF;
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Description of the luminosity evolution for the CERN LHC including dynamic aperture effects. Part II: application to Run 1 data / Giovannozzi, Massimo (CERN) ; Van der Veken, Frederik F. (CERN)
In recent years, modelling the evolution of beam losses in circular proton machines starting from the concept of dynamic aperture its time evolution has been the focus of intense research. Results from single-particle non-linear beam dynamics have been used to build simple models that proved to be in good agreement with beam measurements. [...]
arXiv:1806.03059.- 2018-08-10 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 908 (2018) 1-9 Fulltext: 10.1016_j.nima.2018.08.019 - PDF; 1-s2.0-S016890021830963X-main - PDF; 1806.03059 - PDF;
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A novel technique for injecting and extracting beams in a circular hadron accelerator without using septum magnets / Giovannozzi, Massimo (CERN) ; Franchi, A (ESRF, Grenoble)
With a few exceptions, all on-axis injection and extraction schemes implemented in circular particle accelerators, synchrotrons, and storage rings, make use of magnetic and electrostatic septa with systems of slow-pulsing dipoles acting on tens of thousands of turns and fast-pulsing dipoles on just a few. The dipoles create a closed orbit deformation around the septa, usually referred to as an orbit bump. [...]
CERN-ACC-2015-0063.- Geneva : CERN, 2015 - 12 p. - Published in : Phys. Rev. Spec. Top. Accel. Beams 18 (2015) 074001 APS Open Access article: PDF; Fulltext: PDF;
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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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