Study of partial-waveguide rf-linac FELs for intense THz-pulse generation

M. Tecimer*, D. Oepts, R. Wuensch, A. Gover

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations


In this paper, we present a time-domain analysis of a short pulse partial-waveguide FEL oscillator employing toroidal mirrors and a hole outcoupling. The use of toroidal mirrors with optimized radius of curvatures helps to reduce cavity losses arising from the mismatch of the free space propagating optical field into a waveguided one. We introduce semi-analytical expressions for the calculation of the scattering matrix elements describing the loss and mode coupling mechanism as well as the amount of the extracted power from the cavity. The formulation is implemented in a time-domain FEL code based on modal expansion approach. The described model is applied to a partial-waveguide FEL system and simulation results are compared with measurements.

Original languageEnglish
Pages (from-to)139-145
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
StatePublished - 1 Aug 2004
EventProceedings of the 25th International Free Electron Laser - Tsukuba,Ibaraki, Japan
Duration: 8 Sep 200312 Sep 2003


  • Free electron laser
  • Partial waveguide FEL
  • THz-pulse generation


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