Development of electron gun for miniaturized millimeter-band traveling-wave tube
Dmitry A. Nozhkin1,2, Roman A. Torgashov1,2, Dmitry A. Bessonov1,3, Igor A. Navrotsky1,3, Nikita M. Ryskin1,2; 1Saratov Branch, Institute of Radio-Engineering of RAS, Saratov, Russia; 2Saratov State University, Saratov, Russia; 3 RPE “Almaz”,Saratov, Russia
Abstract
The millimeter-wave (sub-THz) spectral region remains the least developed frequency band of electromagnetic spectrum. Traveling-wave tube (TWT) is high-power wideband vacuum-tube amplifier and is one of the promissing device for millimeter-band operation. The key part of the TWT is electron gun, providing compact high-current electron beam. In this work, we present the results of the development, numerical simulation of operation and fabrication of miniaturized electron gun for compact sub-THz TWTs. Developed design of electron gun can provide 100-150-mA pencil beam at voltages below 15 kV at space-charge limited regime. Numerical 2D- and 3D-simulation was carried out using modern finite-element COMSOL Multiphysics simulation package. The proposed design of electron gun consist of LaB6 1.26-mm cathode and three focusing molybdenium electrodes at zero potential, and molybdenium anode with 0.33-mm apperture. Simulation predicts the 25-times compression of electron beam with output redius of 0.26 mm. Corresponding avareged current density is approximately 200 A/cm2. Components of electrun gun were fabricated using pulsed laser micromichining technology. The experimental electrun gun is under assembling for sunsequent I-V charactersistics experimental measurment.
Speaker
Nozhkin Dmitry
Saratov Branch, Institute of Radio-Engineering of RAS
Russia
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