Nonlinear Delta F Simulations of Collective Effects in Intense Charged Particle Beams PDF Download
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Author: Hong Qin
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Author: Hong Qin
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
A nonlinear delta(f) particle simulation method based on the Vlasov-Maxwell equations has been recently developed to study collective processes in high-intensity beams, where space-charge and magnetic self-field effects play a critical role in determining the nonlinear beam dynamics. Implemented in the Beam Equilibrium, Stability and Transport (BEST) code [H. Qin, R.C. Davidson, and W.W. Lee, Physical Review -- Special Topics on Accelerator and Beams 3 (2000) 084401; 3 (2000) 109901.], the nonlinear delta(f) method provides a low-noise and self-consistent tool for simulating collective interactions and nonlinear dynamics of high-intensity beams in modern and next-generation accelerators and storage rings, such as the Spallation Neutron Source and heavy ion fusion drivers. A wide range of linear eigenmodes of high-intensity charged-particle beams can be systematically studied using the BEST code. Simulation results for the electron-proton two-stream instability in the Proton Storage Ring experiment [R. Macek, et al., in Proc. of the Particle Accelerator Conference, Chicago, 2001 (IEEE, Piscataway, NJ, 2001), Vol. 1, p. 688.] at the Los Alamos National Laboratory agree well with experimental observations. Large-scale parallel simulations have also been carried out for the ion-electron two-stream instability in the very-high-intensity heavy ion beams envisioned for heavy ion fusion applications. In both cases, the simulation results indicate that the dominant two-stream instability has a dipole-mode (hose-like) structure and can be stabilized by a modest axial momentum spread of the beam particles.
Author: Edward A. Startsev
Publisher:
ISBN:
Category : Computer simulation
Languages : en
Pages : 9
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Author: Ronald C. Davidson
Publisher: World Scientific Publishing Company
ISBN: 9781860943010
Category : Science
Languages : en
Pages : 583
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This is a graduate-level text - complete with 75 assigned problems - which covers a broad range of topics related to the fundamental properties of collective processes and nonlinear dynamics of intense charged particle beams in periodic focusing accelerators and transport systems. The subject matter is treated systematically from first principles, using a unified theoretical approach, and the emphasis is on the development of basic concepts that illustrate the underlying physical processes in circumstances where intense self fields play a major role in determining the evolution of the system. The theoretical analysis includes the full influence of dc space charge and intense self-field effects on detailed equilibrium, stability and transport properties, and is valid over a wide range of system parameters ranging from moderate-intensity, moderate-emittance beams to very-high-intensity, low-emittance beams. The statistical models used to describe the properties of intense charged particle beams are based on the Vlasov-Maxwell equations, the macroscopic fluid-Maxwell equations, or the Klimontovich-Maxwell equations, as appropriate.
Author:
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ISBN:
Category :
Languages : en
Pages :
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Author: Anthony Jun-Yin Gee
Publisher:
ISBN: 9780438032798
Category : Mathematics
Languages : en
Pages : 192
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Particle accelerators are ubiquitous in science and society and their use is still growing globally. Beam physics, the physics underlying accelerator science, is focusing in part on studies and applications where intense charged particle beams become essential. The high-intensity may cause new collective instabilities and phenomena which are difficult to be modeled by conventional means. New numerical methods must be developed to efficiently and reliably model, simulate and optimize such high currents. The University of Maryland Electron Ring (UMER) and the Fermilab Integrable Optics Test Accelerator (IOTA) are dedicated test rings to study the high intensity regimes. A 3-D symplectic tracking code, PHAD, was recently developed, which implements the adaptive Fast Multipole Method (FMM) in the differential algebraic (DA) framework to compute accurately and efficiently the self-induced Coulomb forces, and the beam dynamics under the combined external and internal forces. However, beam-environment interactions are missing. To add the beam-wall interactions, a new theory and numerical methods are needed. Previously, the beam-wall interactions were approximated using simplistic geometries that often gave unrealistic results. To this end, we develop the Poisson Integral Solver with Curved Surfaces (PISCS) method and implement it in the general purpose nonlinear dynamics code COSY Infinity. PISCS uses the fast multipole accelerated boundary element method in the differential algebraic framework. PISCS efficiently represents the beam-wall interaction in arbitrary structures. We implement a strategy that can include the beam-wall interaction in other space charge tracking codes too. This work presents and benchmarks PISCS with complicated geometries and includes analyses of space charge and the beam-wall interactions using the extracted transfer maps.
Author: Daniel Nicolos Koury
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
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Author: Chiping Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Author: Tin Lok Chiu
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ISBN:
Category :
Languages : en
Pages :
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A thermal wave model was used to describe the dynamics of high-energy charged-particle beams. A complex beam wave function, \Psi(\xi, \eta), were used to analyze the longitudinal dynamics of particle bunches. In a circular high-energy accelerating machine, the longitudinal evolution was described by Nonlinear Schrodinger Equation (NLSE). Rogue waves are surprisingly large displacements from an equilibrium background. It is a violent event and will constitute a major risk for the beam integrity. Here, second-order rogue wave solutions, which was an exact rational solution to NLSE, were utilized. Locations of second-order rogue waves were correlated with the pole movement of the denominator of the solution in the complex plane, if the longitudinal extension of the beam in the exact solution was extended to the complex plane.This study aims to provide a fast way to investigate and locate th position of extreme event of a charged-particle beam in accelerators. For the analysis, there were two degrees of freedom by inserting two parameters, \beta and \gamma. The locations of the maxima of the particle density have been shown to remarkably coincide with the poles of the rogue wave solutions.
Author: Princeton University. Plasma Physics Laboratory
Publisher:
ISBN:
Category :
Languages : en
Pages : 53
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