Study of electron gun with converging sheet beam for vacuum amplifiers at terahertz frequencies
- 1 к.т.н., начальник лаборатории «», АО «НПП «Алмаз» (г. Саратов), доцент, кафедра ЭПУ, Саратовский государственный технический университет имени Гагарина Ю.А
- 2 д.ф.-м.н., профессор, вед. науч. сотрудник, Саратовский филиал ИРЭ им. В.А. Котельникова РАН
- 3 начальник сектора, АО «НПП «Алмаз» (г. Саратов)
- 4 науч. сотрудник, лаборатория «», АО «НПП «Алмаз» (г. Саратов)
- 5 к.т.н., начальник отдела, АО «НПП «Алмаз» (г. Саратов)
- 6 инженер, лаборатория «», АО «НПП «Алмаз» (г. Саратов)
Abstract
The paper presents the results of numerical simulation and experimental study of electron gun with a linear compression of 4,4 of sheet beam based on a blade thermionic minicathode for TWT at terahertz frequencies. In this paper, we propose a variant of the electron gun with a compression beam on the basis of previous results in the optics work in order to increase the beam current density in the beam tunnel.
From the calculation of the space of interaction between the electron beam and the electromagnetic wave, it is shown that the beam current value reaches 90 mA and the transverse dimension of the beam tunnel is to be 0.2 mm over the frequency range up to 200 GHz. Calculation of formatting the extended electron beams of low perveance is performed taking into account the influence of the initial thermal velocities of the electrons. The results of modeling the electron gun with sheet electron beam with blade cathode with dimensions of 0,2×0,7 mm are presented. The beam transport is carried out under magnetic field with amplitude of 0.7 T. The beam thickness in the tunnel is 0.045 mm, which corresponds to 4.4 of linear compression. A plane of symmetry corner relatively to the beam-focusing electrode has 72°. In this case, the sheet beam simulation generated by electron gun has shown feasibility of beam of low-perveance with low deformation. Rms emittance beam εrms in the beam tunnel does not exceed of 0,6-10−7 π?m-rad. The current density in the beam reaches 283 A / cm2. Using a discharge machining, both the dispenser cathode with operating temperature 1200°C and a focusing grid was fabricated to experimental test of the electron gun layout. During I-V experimental investigations of triode electron gun in a vacuum, there have been a moving anode with the diameter D = 2 mm. In the result of experimental measurements of diode I-V characteristic in the pulsed mode (a duty factor 0.05%, and pulse duration τ = 10 μs), the current density of 264 A / cm2 has been obtained at the cathode current of 84 mA, and the control grid voltage of 1200 V.
How to cite
Бурцев А.А., Григорьев Ю.А., Журавлев С.Д., Навроцкий И.А., Сахаджи Г.В., Шумихин К.В. Исследование электронной пушки с компрессией ленточного потока для вакуумных усилителей терагерцевого диапазона // Радиотехника. 2016. № 7. С. 97–100.
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