|TUP049||Simulating Shot-Noise of ’Real’ Electron Bunches||electron, FEL, simulation, bunching||149|
An algorithm and numerical code for the up-sampling of a system of particles, from a smaller to a larger number, is described. The method introduces a Poissonian ’shot-noise’ to the up-sampled distribution , typical of the noise statistics arising in a bunch of particles generated by a particle accelerator. The algorithm is applied on a phase-space distribution of relatively few simulation particles representing an electron beam generated by particle accelerator modelling software, for subsequent injection into an Free Electron Laser (FEL) amplifier which is used here to describe the model. A much larger number of particles is usually required to model the FEL lasing process than is required in the simulation models of the electron beam accelerators that drive it. A numerical code developed from the algorithm was then used to generate electron bunches for injection into to an unaveraged 3D FEL simulation code, Puffin . Results show good qualitative and quantitative agreement with analytical theory. The program and usage manual is available to download from GitHub .
 B.W.J. McNeil, M.W. Poole and G.R.M. Robb, Physical Review Special Topics - Accelerators and Beams Vol 6, 070701 (2003).
 L.T. Campbell and B.W.J. McNeil, Phys. Plasmas 19, 093119 (2012).
|Poster TUP049 [1.419 MB]|
|DOI •||reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2019-TUP049|
|About •||paper received ※ 20 August 2019 paper accepted ※ 27 August 2019 issue date ※ 05 November 2019|
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