Paper |
Title |
Other Keywords |
Page |
WEPCH114 |
On the Development of a Self-consistent Particle-in-cell (PIC) Code Using a Time-adaptive Mesh Technique
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simulation, gun, PITZ, DESY |
2182 |
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- S. Schnepp, E. Gjonaj, T. Weiland
TEMF, Darmstadt
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For a large class of problems the self-consistent simulation of charged particle beams in linear accelerators is necessary. Especially, in all low-energetic sections such as injectors the self-consistent interaction of particles and fields has to be taken into account. Well-known programs like the MAFIA TS Modules typically use the Particle-in-cell (PIC) method for beam dynamics simulations. Since they use a fixed computational grid which has to resolve the bunch adequately, they suffer from enormous memory consumption. Therefore and especially in the 3D case, only rather short sections can be simulated. A remedy to this limitation is the usage of a grid which refines itself in the vicinity of particles. For this purpose, a new code called SMOVE based on a time-adaptive grid is being developed. First promising results will be presented at the conference.
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WEPCH120 |
Simulation of 3D Space-charge Fields of Bunches in a Beam Pipe of Elliptical Shape
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space-charge, simulation, DESY, damping |
2200 |
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WEPCH121 |
3D Space-charge Calculations for Bunches in the Tracking Code ASTRA
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space-charge, DESY, electron, simulation |
2203 |
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- G. Pöplau, U. van Rienen
Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock
- K. Floettmann
DESY, Hamburg
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Precise and fast 3D space-charge calculations for bunches of charged particles are of growing importance in recent accelerator designs. One of the possible approaches is the particle-mesh method computing the potential of the bunch in the rest frame by means of Poisson's equation. In that, the charge of the particles are distributed on a mesh. Fast methods for solving Poisson's equation are the direct solution applying Fast Fourier Methods (FFT) and a finite difference discretization combined with a multigrid method for solving the resulting linear system of equations. Both approaches have been implemented in the tracking code ASTRA. In this paper the properties of these two algorithms are discussed. Numerical examples will demonstrate the advantages and disadvantages of each method, respectively.
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THPLS115 |
Simulation and Optimisation of a 100 mA DC Photo-Injector
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electron, emittance, gun, cathode |
3550 |
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- F.E. Hannon, C. Hernandez-Garcia
Jefferson Lab, Newport News, Virginia
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A prototype 100mA injector is presently being designed and manufactured jointly between Thomas Jefferson National Accelerator Facility (J-Lab) and Advanced Energy Systems (AES). This paper discusses the physics optimisation and performance of the injector, which has been studied using the space-charge tracking code ASTRA. The objective is to operate the 7MeV injector with 135pC electron bunches at 748.5MHz repetition rate. We show that the longitudinal and transverse electron bunch properties can be realised within the constraints of the design.
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