Generation of controllable plasma wakefield noise in particle-in-cell simulations

Numerical simulations of beam-plasma instabilities may produce quantitatively incorrect results because of unrealistically high initial noise from which the instabilities develop. Of particular importance is the wakefield noise, the potential perturbations that have a phase velocity which is equal t...

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Bibliographic Details
Published in:Physics of plasmas 2017-10, Vol.24 (10)
Main Authors: Moschuering, N., Ruhl, H., Spitsyn, R. I., Lotov, K. V.
Format: Article
Language:English
Subjects:
Computer simulation
Magnetohydrodynamic stability
Noise propagation
Particle in cell technique
Phase velocity
Plasma physics
Simulation
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Summary:Numerical simulations of beam-plasma instabilities may produce quantitatively incorrect results because of unrealistically high initial noise from which the instabilities develop. Of particular importance is the wakefield noise, the potential perturbations that have a phase velocity which is equal to the beam velocity. Controlling the noise level in simulations may offer the possibility of extrapolating simulation results to the more realistic low-noise case. We propose a novel method for generating wakefield noise with a controllable amplitude by randomly located charged rods propagating ahead of the beam. We also illustrate the method with particle-in-cell simulations. The generation of this noise is not accompanied by parasitic Cherenkov radiation waves.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4986399