Experimental study of large-amplitude perturbations in space-charge dominated beams

Detailed experimental measurements are presented concerning the propagation of space-charge waves of varying amplitudes in an intense, charged-particle beam. A short perturbation to the density profile is applied at the electron gun, and both current and mean energy profiles are measured at two loca...

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Bibliographic Details
Published in:Physical review special topics. PRST-AB. Accelerators and beams 2010-03, Vol.13 (3), p.034201, Article 034201
Main Authors: Tian, K., Kishek, R. A., Haber, I., Reiser, M., O’Shea, P. G.
Format: Article
Language:English
Subjects:
Amplitudes
Electron guns
Particle beams
Particle in cell technique
Perturbation
Simulation
Wave propagation
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Summary:Detailed experimental measurements are presented concerning the propagation of space-charge waves of varying amplitudes in an intense, charged-particle beam. A short perturbation to the density profile is applied at the electron gun, and both current and mean energy profiles are measured at two locations downstream. The measurements are compared to predictions of a linear 1D cold-fluid model, and self-consistent particle-in-cell simulations. For sufficiently small perturbation amplitudes, the experiment, simulation, and 1D theory agree. For larger amplitudes, the simulation begins to diverge from theoretical predictions due to nonlinear effects. Experimental observations for large-amplitude perturbations differ markedly from either theory or simulation. With the aid of simulations with mismatched and misaligned beams, this departure of experiments from predictions is demonstrated to be caused by the loss of beam current due to scraping aided by the larger radius of the perturbation.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.13.034201