Forming of space charge wave with broad frequency spectrum in helical relativistic two-stream electron beams: Paper

Alexander V. Lysenko, Iurii I. Volk, A. Serozhko, Oleksandr Rybalko

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We elaborate a quadratic nonlinear theory of plural interactions of growing space charge wave (SCW) harmonics during the development of the two-stream instability in helical relativistic electron beams. It is found that in helical two-stream electron beams the growth rate of the two-stream instability increases with the beam entrance angle. An SCW with the broad frequency spectrum, in which higher harmonics have higher amplitudes, forms when the frequency of the first SCW harmonic is much less than the critical frequency of the two-stream instability. For helical electron beams the spectrum expands with the increase of the beam entrance angle. Moreover, we obtain that utilizing helical electron beams in multiharmonic two-stream superheterodyne free-electron lasers leads to the improvement of their amplification characteristics, the frequency spectrum broadening in multiharmonic signal generation mode, and the reduction of the overall system dimensions.
Original languageEnglish
Article number075202
JournalChinese Physics Letters
Volume34
Issue number7
Number of pages5
ISSN0256-307X
DOIs
Publication statusPublished - 2017

Keywords

  • Free electron lasers
  • Design of specific laser systems
  • Multiharmonic two-stream superheterodyne free-electron lasers
  • Helical electron beams
  • Helical two-stream electron beams
  • Helical relativistic electron beams
  • Quadratic nonlinear theory
  • Two-stream instability
  • Space charge wave harmonics
  • Helical relativistic two-stream electron beams
  • Broad frequency spectrum

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