Apparatus and method for producing ions

Radiant energy – Ion generation – Arc type

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250423R, 31511181, H01J 2700

Patent

active

046970851

ABSTRACT:
A source of a beam of ions includes in a housing a cathode filament, an anode spaced from the cathode and housing an ion emission opening therethrough and an intermediate electrode between the cathode and anode and having an opening therethrough in alignment with the opening in the anode. An inlet opening extends through the housing into the space between the anode and the intermediate electrode to admit a flow of the gas to be ionized into the housing. An outlet opening is through the housing adjacent the cathode and a pump is connected to the outlet opening. In the operation of the ion source a flow of pure ionizing gas is provided through the housing and over the cathode. Some of the gas is ionized to generate the desired ions and the rest of the gas is drawn out of the housing to remove impurities generated at the cathode and thereby increase the lifetime of the cathode.

REFERENCES:
patent: 3408283 (1968-10-01), Chopra et al.
patent: 3409529 (1968-11-01), Chopra et al.
patent: 3448333 (1969-06-01), Arkless et al.
patent: 3513351 (1970-05-01), Kelley
"Ion Beams" by R. G. Wilson and G. R. Brewer, published by J. Wiley and Son, 1973, pp. 48-58 and 61-66.

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