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Theory of Multimode Resonant Backward-Wave Oscillator With an Inclined Electron Beam
Khutoryan, Eduard,Sattorov, Matlabjon,Lukin, Konstantin Alexandrovich,Oh-Joon Kwon,Sun-Hong Min,Bhattacharya, Ranajoy,In-Keun Baek,Seontae Kim,Minwoo Yi,Joonho So,Gun-Sik Park IEEE 2015 IEEE transactions on electron devices Vol.62 No.5
<P>A multimode theory of the resonant backward-wave oscillator (BWO) with an electron beam inclined with respect to the surface of a periodic structure-a clinotron-is presented. It is shown that mode interaction provides phase velocity variation in the interaction space. The beam-wave interaction power increases at a favorable phase velocity profile along the interaction space, which manifests as power peaks in the clinotron zone. In contrast, when it is nonfavorable, there is power drop in the bandwidth. Developed multimode theory results are in satisfactory agreement with the theory of a BWO with reflections and with particle-in-cell simulations.</P>
Improved Efficiency of Backward-Wave Oscillator With an Inclined Electron Beam
Sattorov, M.,Khutoryan, E.,Lukin, K.,Ohjoon Kwon,Gun-Sik Park IEEE 2013 IEEE transactions on electron devices Vol.60 No.1
<P>The possibility of the efficient operation of a backward-wave oscillator (BWO) with an electron beam inclined with respect to the surface of a periodic structure-a clinotron-is analyzed here. The beam inclination provides the possibility of effective interaction by all particles of a thick electron beam with the slow evanescent harmonic of the cavity modes. The problem of electron-beam-wave interaction is treated in a self-consistent formulation. A theoretical analysis shows that the inclination of the electron beam to the grating surface decreases the demand of the clinotron for magnetic field magnitude and beam velocity spread compared to a conventional BWO. It is demonstrated that, for an optimal inclination angle and an optimal beam thickness, the clinotron efficiency exceeds the efficiency of a conventional BWO considerably given the same electron beam parameters. The developed multimode theory results are in satisfactory agreement with the theory of a BWO in terms of reflections and particle-in-cell simulations.</P>
Automodulation Processes in Clinotrons With Low-Focusing Magnetic Field
Sattorov, Matlabjon,Khutoryan, Eduard,Lukin, Konstantin,Ohjoon Kwon,Sun-Hong Min,Bhattacharya, Ranajoy,In-Keun Baek,Seontae Kim,Minwoo Yi,Joonho So,Gun-Sik Park Institute of Electrical and Electronics Engineers 2015 IEEE transactions on electron devices Vol.62 No.5
<P>The automodulation processes in backward-wave oscillator with an inclined electron beam (the clinotron) operating at low-focusing magnetic fields have been studied. The automodulation behavior has been analyzed in the clinotron for different angles of the beam inclination. It has been shown that at low magnetic fields, the RF transverse electric field may cause significant changes in electron trajectories, and hence in the beam-wave interaction power that leads to the automodulation.</P>