Ion source apparatus

Details Ion source apparatus Ion source apparatus

1985-01-09

1987-02-03

Anderson, Bruce C.

Radiant energy

Ion generation

Field ionization type

376121, H01J 2700

Patent

active

046410317

ABSTRACT:
An ion source apparatus comprising a bulk type thermionic cathode, which, when heated, emits thermoelectrons; an anode for causing a gas discharge in cooperation with the cathode thereby producing plasma; a grid electrode for extracting ions out of the plasma; a magnetic member for confining the plasma within a prescribed region; and a ferromagnetic body which surrounds the thermionic cathode. The ferromagnetic body removes the lines of magnetic force produced by magnets from the neighborhood of the surface of the thermionic cathode. As a result, thermoelectrons are freely emitted from the thermionic cathode, thereby ensuring a stable gas discharge.

REFERENCES:
patent: 3453489 (1969-07-01), Cann et al.
patent: 3719554 (1973-03-01), Cole
patent: 4506160 (1985-03-01), Sugawara et al.
"Bulk Cathode and Its Application to Magnetic Multipole Ion Source"; Y. Itoh, T. Sugawara; Proc. Int'l Ion Engineering Congress-ISIAT '83 & IPAT "83-Kyoto (1983), vol. 1, p. 489 (1983).
"Characteristics of the Cleo Tokamak Ion Source", D. A. Aldcroft et al.; Culham Laboratory Rep. CLM-p. 414, 1975.
"Some Characteristics of Tungsten Filaments Operated as Cathodes in a Gas Discharge"; K. W. Ehlers and K. N. Leung; Rev. Sci. Instrum. 50(3), Mar. 1979.

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