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

N. Moschuering, H. Ruhl, R. I. Spitsyn, K. V. Lotov

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Article number103129
Number of pages5
JournalPhysics of Plasmas
Volume24
Issue number10
DOIs
Publication statusPublished - 1 Oct 2017

Keywords

  • INSTABILITIES

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