Skip to Main content Skip to Navigation
Preprints, Working Papers, ...

Spatiotemporal dynamics of ultrarelativistic beam-plasma instabilities

Abstract : An electron or electron-positron beam streaming through a plasma is notoriously prone to micro-instabilities. For a dilute ultrarelativistic infinite beam, the dominant instability is a mixed mode between longitudinal two-stream and transverse filamentation modes, with a phase velocity oblique to the beam velocity. A spatiotemporal theory describing the linear growth of this oblique mixed instability is proposed, which predicts that spatiotemporal effects generally prevail for finite-length beams, leading to a significantly slower instability evolution than in the usually assumed purely temporal regime. These results are accurately supported by particle-in-cell (PIC) simulations. Furthermore, we show that the self-focusing dynamics caused by the plasma wakefields driven by finite-width beams can compete with the oblique instability. Analyzed through PIC simulations, the interplay of these two processes in realistic systems bears important implications for upcoming accelerator experiments on ultrarelativistic beam-plasma interactions.
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-03280355
Contributor : Inspire Hep Connect in order to contact the contributor
Submitted on : Wednesday, July 7, 2021 - 11:44:45 AM
Last modification on : Friday, November 19, 2021 - 5:48:04 PM

Links full text

Identifiers

Collections

Citation

P. San Miguel Claveria, X. Davoine, J.R. Peterson, M. Gilljohann, I. Andriyash, et al.. Spatiotemporal dynamics of ultrarelativistic beam-plasma instabilities. 2021. ⟨hal-03280355⟩

Share

Metrics

Record views

28