Development and Fabrication of Electron-Optical System With Elliptic Electron Beam for a W-Band Traveling-Wave Tube
Dmitry A. Nozhkin1,2, Roman A. Torgashov1,2, Igor A. Navrotskiy1, Anna A. Akst2, Dmitry A. Bessonov1, Nikita M. Ryskin1,2; 1Saratov Branch, Kotelnikov Institute of Radioengineering and Electronics RAS; 2Saratov State University, Saratov, Russia
Abstract
This paper presents the development and numerical simulation of an electron-optical system for sheet-beam generation in miniaturized millimeter-wave vacuum electron devices. A novel stacked-plate electron gun was designed to generate a compact high-aspect-ratio elliptical electron beam. Numerical simulations show that the proposed electron gun produces a beam current of up to 220 mA at accelerating voltages up to 10 kV under space-charge-limited regime. The design provides substantial beam compression by transforming a circular beam into an elliptical one, achieving a beam area compression ratio of 20–25 units and an average current density of approximately 98 A/cm² at a current density from the cathode of approximately 3-4 A/cm². A reversal magnetic focusing system consisting of two sections with peak magnetic fields of 1.3 T is also proposed. The system employs rectangular permanent magnets and iron pole pieces to suppress the diocotron instability and ensure stable beam transport over a distance of 4 cm. Numerical simulations confirm efficient formation and stable transport of the elliptical electron beam, demonstrating the suitability of the proposed electron-optical system for the miniaturization of millimeter-wave vacuum electron devices. The paper also presents the fabrication results of the proposed electron gun. This research is supported by the Russian Science Foundation (grant #22 12 00181).
Speaker
Nozhkin Dmitry
Saratov Branch, Kotelnikov Institute of Radioengineering and Electronics RAS
Russia
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