Generation of controllable plasma wakefield noise in particle-in-cell simulations
Abstract
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.
Keywords
Cite
@article{arxiv.1706.00594,
title = {Generation of controllable plasma wakefield noise in particle-in-cell simulations},
author = {Nils Moschuering and Hartmut Ruhl and Roman Spitsyn and Konstantin Lotov},
journal= {arXiv preprint arXiv:1706.00594},
year = {2017}
}
Comments
6 pages, 8 figures