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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>
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>
Efficient terahertz oscillation using a half-period staggered grating resonator
Kwon, Ohjoon,Sattorov, Matlabjon Abdurahimovich,Min, Sun-Hong,Baek, In-Keun,Kim, Seontae,Bera, Anirban,Barik, Ranjan Kumar,Bhattacharya, Ranajoy,Jeong, Jin-Young,Won, Jong-Hyo,Park, Gun-Sik IOP Publishing 2014 Japanese journal of applied physics Vol.53 No.6
A highly efficient terahertz (THz) radiation mechanism is studied with the use of strong interaction between convection electrons and a half-period phase-shifted grating resonator. The large fraction of the fundamental TE mode is longitudinally polarized, and it excites the intense plasma-terahertz wave coupling at the shallow grating, which enables highly efficient RF generation at a relatively low operating voltage. A particle-in-cell (PIC) simulation predicts that the half-period phase-staggered grating resonator generates 0.22 THz wave with output power exceeding 100 W and interaction efficiency of more than 15% at a low beam acceleration voltage of 5.2 kV. (C) 2014 The Japan Society of Applied Physics
Origin of Sideband and Spurious Noises in Microwave Oven Magnetron
Baek, In-Keun,Sattorov, Matlabjon,Bhattacharya, Ranajoy,Kim, Seontae,Hong, Dongpyo,Min, Sun-Hong,Park, Gun-Sik Institute of Electrical and Electronics Engineers 2017 IEEE transactions on electron devices Vol.64 No.8
<P>The 3-D particle-in-cell (PIC) simulations are performed to determine the origin of sideband and spurious noises generated in a cooker magnetron. A novel simulation technique is used, which introduces cathode emission current nonuniformities. These nonuniformities are due to nonuniform distributions of electric field on a thermionic emission surface, which result from cathode geometry. It is shown that cathode end-caps shape and magnetic pole-piece geometries are the causes of sideband and spurious noises in conventional microwave ovens. The 3-D simulation results are in satisfactory agreement with the spectrum of a typical cooker magnetron. Index</P>
Min, Sun-Hong,Kwon, Ohjoon,Sattorov, Matlabjon,Jung, Hoechun,Baek, In-Keun,Kim, Seontae,Bera, Anirban,Barik, Ranjan Kumar,Bhattacharya, Ranajoy,Park, Gun-Sik IEEE 2017 IEEE transactions on plasma science Vol.45 No.4
<P>Researchers have investigated plasma-related phenomena and internal breakdowns in the gigawatt-terahertz relativistic backward wave oscillator (RBWO) caused by field emissions from the surfaces of the waveguide circuits in these oscillators. In order to increase the power-handling capability of relativistic electron beam devices, an RBWO is proposed in the form of an oversized structure in which the diameter (D) of the electrodynamic structure is increased to several times the free-space wavelength (lambda). An optimal periodic rectangular corrugation structure of which the axial mode is matched to the pi mode is designed in order to determine only the TM01 mode without mode competition in a slow-wave structure (SWS). The oversized RBWO has a fairly large diameter and uses a resonant reflector to achieve optimum efficiency while also preventing mode competition in the SWS. Absorption of a decelerated electron beam is achieved by the collector, which protects against breakdown and damage. The results of 0.5-0.1 THz from 500 kV-5 kA in the relativistic region are observed by means of a particle-in-cell simulation, and the dispersion relationship is determined by a finite-difference time-domain simulation. The outcomes show that a high-power oversized RBWO can control the selection of the mode and the interaction efficiency.</P>