Seoul Teracom Inc.

Seoul, South Korea

Seoul Teracom Inc.

Seoul, South Korea
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Min S.-H.,Seoul National University | Min S.-H.,Korea Institute of Radiological and Medical Sciences | Kwon O.,Seoul National University | Kwon O.,Korea Basic Science Institute | And 9 more authors.
Physics of Plasmas | Year: 2016

An experimental result of a gigawatt-class L-band magnetically insulated transmission line oscillator (MILO) shows the generation of a transient axial mode pertaining to an anode plasma effect in the circuit of the MILO. The transient axial mode between the desired π mode and the 5 π / 6 mode causes the output power to become eccentric. When the electrons impact onto the metallic surface, plasma exists on the surface of the anode due to the electron-impact distortion process. As a result, the anode plasma causes the emitted current to increase the neutralization near the cathode. The increase of the current induces faster and stronger magnetic insulation, which lowers the drift velocity and suppresses the mode earlier during the beam pulse. After the 5 π / 6 mode, which initially interacts with the electron beam, remains as a transient axial mode for a very short time, it shows the capability to convert to the π mode, which is more stable and slowly grows. © 2016 Author(s).


Khutoryan E.,Ukrainian Academy of Sciences | Sattorov M.,Seoul Teracom Inc. | Sattorov M.,Seoul National University | Lukin K.A.,Ukrainian Academy of Sciences | And 8 more authors.
IEEE Transactions on Electron Devices | Year: 2015

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. © 1963-2012 IEEE.


Sattorov M.,Seoul Teracom Inc. | Sattorov M.,Seoul National University | Khutoryan E.,Ukrainian Academy of Sciences | Lukin K.,Ukrainian Academy of Sciences | And 9 more authors.
IEEE Transactions on Electron Devices | Year: 2015

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. © 2015 IEEE.


Bera A.,Seoul National University | Barik R.K.,Seoul National University | Sattorov M.,Seoul National University | Sattorov M.,Seoul Teracom Inc. | And 10 more authors.
Optics Express | Year: 2014

Metallic metamaterials with positive dielectric responses are promising as an alternative to dielectrics for the generation of Cerenkov radiation [J.-K. So et al., Appl. Phys. Lett. 97(15), 151107 (2010)]. We propose here by theoretical analysis a mechanism to couple out Cerenkov radiation from the slab surfaces in the transverse direction. The proposed method based on Brillouin-zone folding is to periodically modify the thickness of the metamaterial slab in the axial direction. Moreover, the intensity of the surface-coupled radiation by this mechanism shows an order-of-magnitude enhancement compared to that of ordinary Smith- Purcell radiation. © 2014 Optical Society of America.


Sattorov M.A.,Seoul National University | Bera A.,Seoul National University | Bera A.,Indian Central Electronics Engineering Research Institute | Sharma A.,Seoul National University | And 12 more authors.
IEEE Transactions on Electron Devices | Year: 2011

Thermal analysis of an L-band 60-kW (continuous-wave) double-ring strapped magnetron for optimizing the design of a cathode support structure and cooling system is presented. This magnetron consists of an oxygen-free copper anode with ten built-in cooling channels and a directly heated tungsten cathode. The operating temperature of the cathode is greater than 2000 °C; therefore, proper thermal design of the cathode support structure is essential for reliable operation. The heat convection coefficient for the forced air is estimated by simulations comparing the simulated temperatures for different heat convection coefficients with the measured one. It is observed that the comparison between simulations with measurement is in good agreement for various temperatures from 1000 °C to 2000 °C when the estimated heat convection coefficient of the forced air is used. © 2010 IEEE.


Sattorov M.,Seoul National University | Sattorov M.,Seoul Teracom Inc. | Khutoryan E.,Ukrainian Academy of Sciences | Lukin K.,Ukrainian Academy of Sciences | And 3 more authors.
IEEE Transactions on Electron Devices | Year: 2013

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. © 1963-2012 IEEE.

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