| Paper |
Title |
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| TUPPH019 |
Present Status of the Israeli FEL: Increasing FEL Power by Electron Beam Energy Boosting
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352 |
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- Y. Socol, E. Dyunin, A. Gover, M. Volshonok
University of Tel-Aviv, Faculty of Engineering, Tel-Aviv
- M. Einat, Yu. Lurie, Y. Pinhasi, A. Yahalom
CJS, Ariel
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The status of R&D work aimed on increasing FEL power by boosting the electron beam energy after the radiation build-up is reported. A fine control of the electron beam energy during the radiation pulse is designed to compensate the small energy degradation during the pulse. Also, a controlled ramp (up or down) in the electron energy during the pulse will be applicable as well. Theoretical estimations of the output power in the presence of electron energy change during the pulse compared to the obtained experimental results are presented. 2 models, showing good agreement between them and with the existing data, are compared: low-gain analytical model based on the pendulum equation, and rigorous 3D FEL interaction model solved numerically. Another expected result of the design is to further extend the pulse duration with stable conditions and to obtain improved coherency. The electrical and mechanical lay-outs of the high-voltage boosting (leading to electron beam energy boosting) are also presented.
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| TUPPH032 |
Development of Powerful FEMs for X, Ka and W Bands for Physical and Industrial Applications
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390 |
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- M. Einat
CJS, Ariel
- N. S. Ginzburg, N. Yu. Peskov, M. I. Petelin
IAP/RAS, Nizhny Novgorod
- A. Gover, Y. Socol
University of Tel-Aviv, Faculty of Engineering, Tel-Aviv
- A. Kaminsky, S. Sedykh
JINR, Dubna, Moscow Region
- J. Lucas
University of Liverpool, Liverpool
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FEMs are among the main sources of powerful microwave pulses from X to W-bands. Interest to such sources is caused by the large number of potential physical and industrial applications, requiring a wide variety of the radiation parameters. The new generation of the accelerators (SLAC, CERN) requires sources of ~100 MW pulse RF power at 30-38 GHz with a narrow spectrum. Material processing stations require kW-level average power. Alternatively, spectroscopic and biological experiments require lower power but for a specific frequency spectrum. The possibility to develop such sources is being studied at Tel-Aviv University, IAP RAS, JINR and The University of Liverpool within the framework of the INTAS collaboration project. Three successful FEM experiments have been carried out:- Electrostatic-accelerator driven 70-130 GHz Tandem-FEM with kW-level pulse power (Tel-Aviv University.)
- Linac-driven 30-GHz FEM-oscillator with pulse RF power of ~ 20 MW (JINR + IAP RAS)
- Sub-relativistic e-beam industrial FEM tunable over X-band with output power up 1 kW (The University of Liverpool).
The presentation summarizes the progress in the development of FEMs and their applications.
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| TUPPH018 |
New Resonator for the Israeli FEL
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349 |
| |
- 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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