S-Band Coaxial Vircator With Electron Beam Premodulation Based on Compact Linear Transformer Driver

A two-section coaxial vircator with radial electron beam injection and electrodynamic feedback was developed. The use of electron beam premodulation in the vircator allows an increase in efficiency and ensures single-mode oscillation. The vircator operates with no external magnetic field, features a...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2010-10, Vol.38 (10), p.2819-2824
Main Authors: Kovalchuk, B M, Polevin, S D, Tsygankov, R V, Zherlitsyn, A A
Format: Article
Language:English
Subjects:
Antenna radiation patterns
Beams
Cathodes
Diodes
Drivers
Electric currents
Electric potential
electromagnetic radiation
Electron beams
Electrons
Feedback
Magnetic fields
Microwave antennas
microwave generation
Microwave oscillators
Oscillations
Plasma
Pulse duration
Resonant frequency
Resonators
Transformers
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Summary:A two-section coaxial vircator with radial electron beam injection and electrodynamic feedback was developed. The use of electron beam premodulation in the vircator allows an increase in efficiency and ensures single-mode oscillation. The vircator operates with no external magnetic field, features a comparatively low operating impedance of the vacuum diode (10-15 Ω), and makes feasible wide-band frequency tuning through varying the resonator parameters. The vircator was simulated using the PIC-code KARAT. It is shown that, in a wide range of electron beam power (10-25 GW), the oscillation efficiency is 12%-15% and the frequency tuning bandwidth is 15 %. In the experiments on a compact linear transformer driver at a cathode voltage of 300 kV, diode current of 20 kA, and driving pulse duration of 250 ns, the single H 11 mode oscillation at 2.2 GHz with a 300-MW microwave peak power and 130-ns pulse duration at half the power level was realized.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2010.2060367