For citation:
Ploskikh A. J., Ryskin N. M. Simulation of a Sub-THz Traveling Wave Tube with Multiple Sheet Electron Beam. Izvestiya of Saratov University. Physics , 2019, vol. 19, iss. 2, pp. 113-121. DOI: 10.18500/1817-3020-2019-19-2-113-121
Simulation of a Sub-THz Traveling Wave Tube with Multiple Sheet Electron Beam
Background and Objectives: Many applications, such as highdata-rate wireless communications, spectroscopy, high-resolution radar, biomedical imaging, security, etc. require compact highpower sources of sub-THz radiation. Traveling wave tube (TWT) amplifiers are the most promising candidates for such sources combining 10–100 W power and wide b andwidth. Here we present the results of design and simulation of a 0.2 THz TWT with a grating slow-wave structure (SWS) and electron-optical system (EOS) with three elliptic-sha ped beams. Materials and Methods: We have conducted numerical simulation of a 0.22 THz TWT amplifier with three elliptic-shaped electron beams and dual-grating staggered SWS. For SWS design and simulation of cold electromagnetic parameters, a fast and accurate code based on the integral equation method was used. For calculation of small-signal and large-signal g ain regimes, the well-known 1D nonlinear frequency-domain TWT theory was used. Results: Dispersion characteristics of different transverse modes in the dual-grating SWS are calculated. The electron beam with 21.4 kV dc beam voltage is synchronous with the third-order transverse mode in a wide range of frequencies around 0.22 THz. Small-signal gain for 100 mA total beam current (i.e. 33.3 mA current of each beamlet) is calculated. For 21.4 kV beam voltage, the gain is aro und 15 dB in 200–250 GHz frequency band. Large signal gain calculations show that over 50 W output power may be attained. Conclusions: In this paper, the possibility of developing a 0.22 THz TWT amplifier with a dual-grating staggered SWS and electron beam consisting of th ree elliptic beamlets is considered. Such a design with increased cross section allows to decrease the current density, which opens up the possibility of a continuous-wave operation. In addition, it facilitates the beam focusing by the magnetic field.
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