Plasma-anode electron gun

Details Plasma-anode electron gun Plasma-anode electron gun

1986-03-24

1987-11-17

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Discharge device load with fluent material supply to the...

Electron or ion source

31511131, 31511141, 31323131, H01J 724, H05B 3126

Patent

active

047076372

ABSTRACT:
A plasma-anode electron gun includes a cathode means of a material such as molybdenum having a relatively high ratio of emission of secondary electrons to impinging helium ions. A hollow annular anode structure (16) contains an ionized plasma, and has a central opening (38) through which the electron beam (36) is directed, when ions from the anode are released to impinge upon the cathode (12). The anode and ion source structure may be grounded, and ions are released through openings facing the cathode when a positive trigger pulse is applied to one or more electrodes extending within the plasma. The cathode is preferably operated at a voltage in the order of thirty to two hundred thousand volts negative with respect to the cathode. Leakage of ions from the hollow anode may be inhibited by the provision of a supplemental grid biased to a low positive potential.

REFERENCES:
patent: 3411035 (1968-11-01), Necker et al.
patent: 3970892 (1976-07-01), Wakalopulos
patent: 4025818 (1977-05-01), Giguere et al.
patent: 4570106 (1986-02-01), Sohval et al.
patent: 4642522 (1987-02-01), Harvey et al.
patent: 4645978 (1987-02-01), Harvey et al.

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