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- A. Faingersh, J. Dadoun, Kh. Garb, A. Gover, Y. Socol
University of Tel-Aviv, Faculty of Engineering, Tel-Aviv
- G. G. Denisov, M. Y. Shmelyov
IAP/RAS, Nizhny Novgorod
- M. Einat, B. Kapilevich, B. Litvak, Y. Pinhasi, A. Yahalom
CJS, Ariel
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The Israeli FEL resonator was re-designed in order to reduce the overall round-trip losses and achieve control on the radiation output-coupling. In its new configuration, the resonator consists of overmoded corrugated rectangular waveguide and two radiation mode splitters, separating the high-energy e-beam from the laser radiation. The electron input splitter is based on Talbot effect in an overmoded rectangular waveguide. The radiation out-coupling is done in the output splitter. It is based on novel design and it combines Talbot effect between two parallel plates with free space propagation, and focusing by two curved cylindrical mirrors in a confocal imaging scheme. The waveguide and the splitters were tested experimentally, showing improved performance in comparison with the former resonator. The measured unloaded Q-factor of the new version is increased by a factor of ~ 3, attaining up to Q=30,000. Accordingly, the round-trip losses are ~15%. Rotating grids control the radiation out-coupling allowing wide variation for maximization of the radiation output power and extraction efficiency. The design layout and the testing results are presented.
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