New resonator for the Israeli FEL

A. Faingersh, Y. Socol, E. Dyunin, J. Dadoun, Kh Garb, A. Gover*, M. Einat, B. Litvak, B. Kapilevich, Y. Pinhasi, A. Yahalom, G. Denisov, M. Shmelev

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review


The Israeli FEL resonator (W-band 75-110 GHz) was re-designed in order to reduce the overall round-trip losses and to control the radiation out-coupling. In its new configuration, the resonator consists of an overmoded corrugated rectangular waveguide and two radiation mode splitters, separating the high-energy e-beam from the mm-wave radiation. The electron input splitter is based on Talbot effect in an overmoded rectangular waveguide. The radiation out-coupling takes place in the output splitter. The splitter is based on a novel design. It combines Talbot effect between two parallel plates with free space propagation and with focusing by two curved cylindrical mirrors in a confocal imaging scheme. The waveguide and the splitters were tested, showing improved performance in comparison with the former resonator. The measured unloaded Q-factor of the new resonator is increased by a factor of ∼3, up to Q=25,000. Accordingly, the round-trip losses are ∼23%. Rotating grids control the radiation out-coupling, allowing optimization of the radiation power and the extraction efficiency. The design layout and the testing results are presented.

Original languageEnglish
Number of pages3
StatePublished - 2006
Event28th International Free Electron Laser Conference, FEL 2006 - Berlin, Germany
Duration: 27 Aug 20061 Sep 2006


Conference28th International Free Electron Laser Conference, FEL 2006


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