Streaming instabilities in converging geometry

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We present an investigation into counter-streaming electron beams converging towards, and diverging from, a single point in two dimensions, leading to two-stream and current filamentation instabilities, which have radial and azimuthal density modulations, respectively. Using a semi-analytical approach and numerical simulations, we find no evidence for the two-stream instability in this geometry, but show that the system is unstable to the development of current filamentation.
Original languageEnglish
Title of host publicationRelativistic Plasma Waves and Particle Beams as Coherent and Incoherent Radiation Sources III - Proceedings
EditorsDino A. Jaroszynski, MinSup Hur
Place of PublicationBellingham, Washington
Number of pages7
ISBN (Electronic)9781510627383
Publication statusPublished - 24 Apr 2019
EventSPIE Optics + Optoelectronics - Clarion Congress Hotel, Prague, Czech Republic
Duration: 1 Apr 20194 Apr 2019


ConferenceSPIE Optics + Optoelectronics
Country/TerritoryCzech Republic


  • streaming instabilities
  • plasma
  • current filamentation instabilities
  • converging geometry
  • focusing electron beams


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