Microwave generation from an axially extracted virtual cathode oscillator with a guide magnetic field
- Department of General Physics, Sofia University, Sofia 1126 (Bulgaria)
The operation of a virtual cathode oscillator (vircator) with strong axial magnetic field has been experimentally studied. Depending on the cathode--anode gap and cathode diameter, the operating voltage varies from 200 kV up to 480 kV with 2--7 kA diode current. Microwave emission is produced by the oscillating virtual cathode. The central microwave frequency follows the beam plasma frequency. It varies by 11.5 GHz up to 22 GHz, depending on the current density. The oscillation frequency does not depend on the guide magnetic field magnitude. A maximal output power of 15[plus minus]5 MW in asymmetric transverse magnetic (TM) modes is achieved by the axially extracted vircator. Variation of the magnetic field intensity in a range of 0--40 kG has an insignificant effect upon the emitted microwave power. An electron beam power to microwave power conversion efficiency of approximately 1% is obtained.
- OSTI ID:
- 6690764
- Journal Information:
- Physics of Plasmas; (United States), Journal Name: Physics of Plasmas; (United States) Vol. 1:4; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700390* -- Other Plasma Physics Studies-- (1992-)
BEAMS
CATHODES
DIODE TUBES
ELECTRODES
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
ELECTRON TUBES
ELECTRONIC EQUIPMENT
EQUIPMENT
LEPTON BEAMS
MAGNETIC FIELDS
MICROWAVE EQUIPMENT
MICROWAVE RADIATION
MICROWAVE TUBES
OSCILLATORS
PARTICLE BEAMS
POWER
RADIATIONS