Development of the W-band traveling-wave tube with sheet electron beam and staggered double-grating slow wave structure

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In this work, results of development of a W-band O-type traveling-wave tube with sheet electron beam are presented. The staggered double-grating slow-wave stricture with wideband input/output coupling structures was designed and optimized and its high-frequency electromagnetic parameters were calculated. The results of 3D particle-in-cell simulation of beam-wave interaction in the TWT are presented. Gain over 30 dB in the 25-GHz frequency band was obtained. A sample of an electron gun with an impregnated cathode, focusing electrode, and anode, providing the formation of a sheet electron beam with a high-aspect ratio and a current of 0.1 A, was designed and fabricated. The design of the vacuum window is presented, and the technology of its fabrication is discussed.

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Sobre autores

V. Titov

V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS; Saratov State University

Email: torgashovra@gmail.com

Saratov Branch V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS

Rússia, 38 Zelenaya St., Saratov, 410019; 83 Astrakhanskaya St., Saratov, 410012

I. Chistyakov

V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS; “RPE “Almaz”

Email: torgashovra@gmail.com

Saratov Branch V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS

Rússia, 38 Zelenaya St., Saratov, 410019; 1 Panfilova St., Saratov, 410033

I. Navrotsky

V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS; “RPE “Almaz”

Email: torgashovra@gmail.com

Saratov Branch V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS

Rússia, 38 Zelenaya St., Saratov, 410019; 1 Panfilova St., Saratov, 410033

D. Zolotykh

V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS; “RPE “Almaz”

Email: torgashovra@gmail.com

Saratov Branch V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS

Rússia, 38 Zelenaya St., Saratov, 410019; 1 Panfilova St., Saratov, 410033

R. Torgashov

V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS; Saratov State University

Autor responsável pela correspondência
Email: torgashovra@gmail.com

Saratov Branch V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS

Rússia, 38 Zelenaya St., Saratov, 410019; 83 Astrakhanskaya St., Saratov, 410012

О. Abramov

Saratov State University

Email: torgashovra@gmail.com
Rússia, 83 Astrakhanskaya St., Saratov, 410012

E. Gorshkova

“RPE “Almaz”

Email: torgashovra@gmail.com
Rússia, 1 Panfilova St., Saratov, 410033

V. Emelyanov

V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS; “RPE “Almaz”

Email: torgashovra@gmail.com

Saratov Branch V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS

Rússia, 38 Zelenaya St., Saratov, 410019; 1 Panfilova St., Saratov, 410033

N. Ryskin

V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS; Saratov State University

Email: torgashovra@gmail.com

Saratov Branch V.A. Kotelnikov Institute of Radio Engineering and Electronics RAS

Rússia, 38 Zelenaya St., Saratov, 410019; 83 Astrakhanskaya St., Saratov, 410012

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2. Fig. 1. Scheme of a dual comb type ZS.

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3. Fig. 2. Results of modeling the electrodynamic characteristics of the ZS: a — dispersion characteristics of the symmetric (1), antisymmetric (2) mode and the electron beam at a voltage of 12.7 kV (3); b — dependence of the coupling resistance K on the frequency for the working +1st spatial harmonic.

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4. Fig. 3. Design of a broadband energy input/output matching device (a) and S-parameters of the ES (b).

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5. Fig. 4. Dependence of the linear gain coefficient G on frequency (a) and dependence of the output power P on frequency for different values ​​of input power (b): 10 (1), 20 (2), 50 (3), 100 mW (4).

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6. Fig. 5. Three-dimensional computer model of the electron gun (a) and a photograph of the experimental model (b): 1 - cathode; 2 - focusing electrode; 3 - anode; 4 - electron flow. The colors show the electron energy, changing from 0 to 12.7 keV.

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7. Fig. 6. Experimentally measured VAC of the gun.

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8. Fig. 7. Computer model of a vacuum window in the form of an inclined mica plate in a waveguide.

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9. Fig. 8. Dependences of the VSWR of the vacuum window on the frequency with a mica plate thickness of 85 µm and an inclination angle of 60° (1), 65° (2), 70° (3) and 75° (4).

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10. Fig. 9. Photograph of a vacuum-tight “mica plate–metal” connection: 1 — mica disk, 2 — titanium ring, 3 — blank made of MD-15 pseudo-alloy.

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11. Fig. 10. Dependences of the VSWR on the frequency for a mica disk 85 µm thick, normally located in the waveguide: 1 — experimental measurements; 2 — results of calculation using formula (3).

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