Electron beam behavior in an axially-extracted virtual cathode oscillator

Author

Yatsuzuka, Mitsuyasu ; Nagakawa, Kenji ; Hashimoto, Yoshiyuki ; Ishihara, Osamu ; Nobuhara, Sadao

Author_Institution

Dept. of Electr. Eng., Himeji Inst. of Technol., Hyogo, Japan

Volume

22

Issue

5

fYear

1994

fDate

10/1/1994 12:00:00 AM

Firstpage

939

Lastpage

944

Abstract

High-power microwave generation in an axially-extracted virtual cathode oscillator has been studied experimentally. The microwave emission of 120 MW at frequencies in the range of 10-12 GHz is observed in the presence of annular electron beam operated at a 300 kV and 20 kA. The electron beam current in the diode region is well characterized by the electron space-charge-limited current in bipolar flow, which is well below the critical current defined for diode pinching. The observed microwave emission is accompanied by the strongly pinched electron beam. Essential feature of such a pinching effect for the microwave generation is confirmed by the absence of emission when the pinch of electron beam is suppressed by the application of the axial magnetic field

Keywords

microwave generation; space charge; vircators; 10 to 12 GHz; 120 MW; 20 kA; 300 kV; annular electron beam; axial magnetic field; axially-extracted virtual cathode oscillator; bipolar flow; critical current; diode pinching; diode region; electron beam behavior; electron beam current; electron space-charge-limited current; high-power microwave generation; microwave emission; microwave generation; pinched electron beam; pinching effect; Anodes; Cathodes; Critical current; Diodes; Electron beams; Frequency; Helium; Microwave generation; Microwave integrated circuits; Microwave oscillators;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.338311

Filename

338311