| Paper | Title | Page |
|---|---|---|
| TUPSB13 | Charged Particle Dynamics Optimization in Discrete Systems | 259 |
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| Discrete optimization methods of dynamic systems are widely presented in the scientific literature. However, to solve various problems of beam dynamics optimization, it is necessary to create special optimization models that would take into account the specifics of the problems under study. The paper proposes a new mathematical model that includes the joint optimization of a selected (calculated) motion and an ensemble of perturbed motions. Functionals of a general form are considered, which makes it possible to estimate various characteristics of a charged particle beam and the dynamics of the calculated trajectory. The optimization of a bundle of smooth and nonsmooth functionals is investigated. These functionals estimate both the integral characteristics of the beam as a whole and various maximum deviations of the parameters of the particle beam. The variation of a bundle of functionals is given in an analytical form, which allows us to construct directed optimization methods. The selected trajectory can be taken, for example, as the trajectory of a synchronous particle or the center of gravity of a beam (closed orbit). We come to discrete models when we consider the dynamics of particles using a transfer matrices or transfer maps. Optimization problems can be of orbit correction, dynamic aperture optimization, and many other optimization problems in both cyclic and linear accelerators of charged particle beams. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB13 | |
| About • | Received ※ 16 September 2021 — Revised ※ 18 September 2021 — Accepted ※ 20 September 2021 — Issued ※ 22 October 2021 | |
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| WEPSC16 | Numerical Research of Design Solutions for the Bending Magnets of the Electron Beam Facility GESA-1M | 376 |
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| Comparative simulations of magnet configurations have been performed searching for the optimum design of bending magnets for the intense pulsed electron beam facility GESA-1M. GESA-1M is used for improvement of material surface properties and is capable to generate a 120 kV, 10 A/cm2, 50 mks electron beam with the diameter of 10 cm. One of specific concerns is to prevent the beam path from contamination withμparticles of treated materials. To overcome this problem a system of bending magnets is used. The beam trajectory through electric and magnetic fields was simulated for three candidate configurations of the bending magnets. A comparison was focused on the expected power density and divergence angle at the target. The most efficient concept was found to be two pairs of coils arranged orthogonally to each other. This configuration produces highly uniform distribution of the current density at the target, the divergence angle being as low as several degrees. An important advantage is that the initial beam power can be intensified by a 20% at the target. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC16 | |
| About • | Received ※ 28 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 19 October 2021 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
TUPSB14 |
On a New Approach to the Beam Dynamics Optimization | |
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| The talk deals with the problem of joint optimization of programmed and perturbed motions using a combination of smooth and nonsmooth functionals. Continuous nonlinear dynamical systems are investigated. Programmed motion is understood as a certain calculated motion, for example, the dynamics of a synchronous particle in accelerators. Perturbed movements are described by equations in deviations from the design movement, i.e. particle beam dynamics. The dynamics of perturbed motions substantially depends on the choice of the programmed motion. Simultaneous optimization of programmed and perturbed motions turns out to be quite effective. For a more complete description of various characteristics of the beam, it is proposed to use a new combination of smooth and nonsmooth functionals. Smooth functionals mainly estimate different average beam characteristics. Nonsmooth functionals estimate the maximum deviations of particles by one parameter or another. Optimization methods developed on the basis of the proposed approach have shown their effectiveness. The optimization of the dynamics of charged particles in RFQ structure has been carried out. The paper presents the results of numerical optimization. The developed optimization methods can be used to study the dynamics of charged particles and in other types of accelerators. | ||
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| FRA03 | Simulation and Design of the Permanent Magnet Multipole for DC140 | 99 |
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| Permanent magnet (PM) multipoles in some cases are good candidates in accelerator applications for beam transportation and focusing. The PM quadrupole will be utilized in the DC140 cyclotron which is under construction in JINR. A passive magnetic channel and a PM quad will be used for the compensation of horizontal defocusing in the high and low field regions, respectively. The quad is designed as a set of identical PMs rigidly fixed in a non-magnetic housing and capable to generate a a 8.1 T/m gradient field in the 64x25 mm aperture and 29.926 cm effective length. The error of linear approximation should be 1% or less. A special study was accomplished to define the PM specification reasoning from the demand for desired field strength, simple geometry, minimized nomenclature, and commercial availability. The quad design was selected with the use a 2D analytical model and then optimized in iterative 3D FE simulations with realistic PM shape and magnetic characteristics in mind. The resultant concept is the quad formed with 6 coaxial sections each 5cm in width. Every section has 26 identical PM bricks with the dimensions 11mmx11mmx50mm and different orientations. The PM bricks have remanent induction of 1.185 T and magnetic susceptibility of 0.1. Temperature characteristics and expected lifetime were also analysed. From the results obtained, candidate PM materials were proposed and mechanical and magnetic precision were recommended. | ||
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Slides FRA03 [1.465 MB] | |
| DOI • | reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-FRA03 | |
| About • | Received ※ 09 September 2021 — Accepted ※ 29 September 2021 — Issued ※ 12 October 2021 | |
| Cite • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |