Characterization of modes in coaxial vircator

• Published in: IEEE transactions on plasma science Vol. 34; no. 1; pp. 7 - 13
• Main Authors: Shao, Hao, Liu, Guozhi, Yang, Zhanfeng, Chen, Changhua
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.02.2006; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Anodes; Applied sciences; Beam-wave interaction; Character generation; Coaxial components; coaxial vircator; Computer simulation; Diagnostic systems; Electromagnetic fields; Electronic tubes, masers; Electronics; Exact sciences and technology; Gain; High power microwave generation; high-power microwaves (HPM); Holes; Magnetic fields; Mathematical models; Microwave generation; Microwaves; Normal distribution; Numerical simulation; Pulse generation; Simulation; Tellurium; virtual cathode oscillator; Waveguide resonator; Vircators; Beam-wave interaction; Theoretical study; Electron beam; Microwave generation; Experimental study; TM mode; virtual cathode oscillator; Military application; Microwave generator; Cylindrical waveguide; Three dimensional model; Beam wave interaction; Field distribution; High power; Microwave oscillator; Particle oscillation; Numerical simulation; coaxial vircator; Cavity resonator; Microwave amplifier; high-power microwaves (HPM); Microwave emission
• ISSN: 0093-3813; 1939-9375
• DOI: 10.1109/TPS.2005.863895

Modes' character of high-power microwave (HPM) pulses generated in coaxial vircator is discussed. The electromagnetic (EM) field gains due to beam-wave interaction for TM/sub 01/ and TE/sub 11/ modes are derived according to the E-field distribution pattern inside the anode cavity. Two-and-a-half dimensional (2.5-D) and three-dimensional (3-D) computer simulations are carried out to determine the main mode under different numerical simulation coordinate systems. Finally, the experimental verification is obtained by two different diagnostic methods. The results indicate that for most cases, the TE/sub 11/ mode dominates the output power in the coaxial vircator studied.