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

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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