Enhancing Electron Beam Radiative Energy Extraction Efficiency in Free-Electron Laser Oscillators Through Beam Energy Ramping

H. S. Marks*, Yu Lurie, E. Dyunin, A. Gover

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Free-electron lasers are used to generate laser radiation using an accelerated electron beam. In this paper, an electrostatic accelerator was used with a thermionic cathode. Lasing pulses of the order of tens of microseconds were generated by passing the current pulses through a wiggler and resonator combination. The change in lasing power as a result of postsaturation variation of the energy of the electron beam during the lasing period is presented in this paper in the form of experimental measurements and simulations. In the experiments, the initial electron beam energy was 1.4 MeV and the current was 1.13 A, whilst the lasing frequency was always close to 102 GHz. It is shown that postsaturation, positively ramping the beam energy increases the radiation extraction efficiency by around 50%. Whilst a falling beam energy results in a reduction in extraction efficiency.

Original languageEnglish
Article number7932196
Pages (from-to)4218-4224
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Volume65
Issue number11
DOIs
StatePublished - Nov 2017

Keywords

  • Energy extraction
  • free-electron laser (FEL) oscillator
  • radiation power optimization

Fingerprint

Dive into the research topics of 'Enhancing Electron Beam Radiative Energy Extraction Efficiency in Free-Electron Laser Oscillators Through Beam Energy Ramping'. Together they form a unique fingerprint.

Cite this