Microwave vacuum tube devices employing electron sources compris

Details Microwave vacuum tube devices employing electron sources compris Microwave vacuum tube devices employing electron sources compris

1996-05-01

1998-08-18

Pascal, Robert

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

313311, 313336, H01J 2304

Patent

active

057962111

ABSTRACT:
In accordance with the invention, a microwave vacuum tube device, such as a traveling wave tube, is provided with an electron source comprising activated ultrafine diamonds. Applicants have discovered that ultrafine diamonds (5-1,000 nm diameter), when activated by heat treatment in a hydrogen plasma, become excellent room-temperature electron emitters capable of producing electron emission current density of at least 10 mA/cm.sup.2 at low electric fields of 10 V/micrometer. Sources using these diamonds provide electrons for microwave vacuum tubes at low voltage, low operating temperature and with fast turn-on characteristics. A multiple grid structure is described for providing high quality electron beams particularly useful for traveling wave tubes.

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patent: 5155412 (1992-10-01), Chang et al.
patent: 5604401 (1997-02-01), Makishima
patent: 5623180 (1997-04-01), Jin et al.
patent: 5637950 (1997-06-01), Jin et al.
patent: 5648699 (1997-07-01), Jin et al.

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