Plasma-assisted high-power microwave generator

Details Plasma-assisted high-power microwave generator Plasma-assisted high-power microwave generator

1988-04-14

1990-03-27

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

31511121, 315 3, 31323131, H01J 2316, H01J 2534

Patent

active

049123670

ABSTRACT:
A high-power microwave/mm-wave oscillator is filled with an ionizable gas at a pressure of about 1-20 mTorr, into which an electron beam is injected at a high current density of at least about 1 amp/cm.sup.2, but typically 50-100 A/cm.sup.2. A plasma is formed which inhibits space-charge blowup of the beam, thereby eliminating the prior requirement of a magnet system to control the beam. The system functions as a slow-wave tube to produce narrow-band microwaves for a gas pressure of about 1-5 mTorr, and as a plasma wave tube to produce broadband microwave/mm-wave radiation for a gas pressure of about 10-20 mTorr. A new high output, hollow-cathode-plasma electron gun is employed in which a metal oxide layer is formed on the inner surface to enhance the secondary electron yield; a cathode, grid, and extraction anode have respective sets of multiple apertures which are mutually aligned to yield a high perveance beam; the cathode, grid, and anode are curved to geometrically focus the beam, and a beam with a circular cross-section is generated.

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