Powerful Cherenkov masers with 2D slow-wave structures intended for powering systems of Compton-type FELs

Spatially-extended high-power Cherenkov masers operating in millimeter wavelength band intended for using in powering systems of Compton-type FELs are under development in collaboration of IAP RAS (Nizhny Novgorod) and BINP RAS (Novosibirsk). Electrodynamic systems of such oscillators are based on 2D periodical slow-wave structures realizing 2D distributed feedback mechanism, allowing for provision of stable narrow-band oscillation regime under conditions of substantial oversize. This novel feedback mechanism is examined for the oscillators of different geometry. Project of cylindrical slow-wave oscillator of such type operating at Ka-band with sub-GW power level was elaborated based on the tubular electron beam at the “Sinus-6” accelerator 0.5 MeV / 5 kA / 20 ns (IAP RAS). Prospect for further increase of the radiation power is studied in W-band planar Cherenkov maser driven by large-size sheet electron beam forming by the “ELMI” accelerator 1 MeV / 7 kA / 3 μs (BINP RAS). Design parameters, key components and results of simulations of these oscillators are presented, status and results of their experimental studies are discussed.

[1]  V. Ivanov,et al.  Stimulated Compton scattering from relativistic electron beam , 1979 .

[2]  P. Sprangle,et al.  A unified theory of magnetic bremsstrahlung, electrostatic bremsstrahlung, Compton-Raman scattering, and Cerenkov-Smith-Purcell free-electron lasers , 1981, IEEE Journal of Quantum Electronics.

[3]  S. Kuzikov,et al.  Pumping Systems for Compton Free-Electron Lasers: Microwave Undulators and Powering Sources , 2019, Radiophysics and Quantum Electronics.

[4]  S. Kuzikov,et al.  Regime of “multi-stage” trapping in electron masers , 2018, Physics of Plasmas.

[5]  V. V. Rostov,et al.  A multigigawatt X-Band relativistic backward wave oscillator with a modulating resonant reflector , 2008 .

[6]  G. Bowden,et al.  Experimental demonstration of a tunable microwave undulator. , 2014, Physical review letters.

[7]  M. Petelin,et al.  Generation of powerful electromagnetic radiation pulses by a beam of relativistic electrons , 1973 .

[8]  V. Granatstein,et al.  Demonstration of a Two-Stage Backward-Wave-Oscillator Free-Electron Laser , 1983 .

[9]  S. Kuzikov,et al.  Flying radio frequency undulator , 2014 .

[10]  S. Kuzikov,et al.  Tapered Flying Radiofrequency Undulator , 2018 .

[11]  V. Granatstein,et al.  A high-power, free-electron laser based on stimulated Raman backscattering. Interim report , 1978 .

[12]  M. Petelin,et al.  Energy feasibility of a relativistic Compton laser , 1978 .

[13]  V. D. Stepanov,et al.  Using Two-Dimensional Distributed Feedback for Synchronization of Radiation from Two Parallel-Sheet Electron Beams in a Free-Electron Maser. , 2016, Physical review letters.

[14]  Victor L. Granatstein,et al.  Overmoded GW-class surface wave microwave oscillator , 2000, ICOPS 2000. IEEE Conference Record - Abstracts. 27th IEEE International Conference on Plasma Science (Cat. No.00CH37087).

[15]  R. Pantell,et al.  Stimulated photon-electron scattering , 1968 .