Ion source

Details Ion source Ion source

1983-06-20

1985-12-24

Chatmon, Saxfield

Electric lamp and discharge devices: systems

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

250423F, 250427, 313336, 3133631, 31511181, H01J 724, H05B 3126

Patent

active

045609071

ABSTRACT:
An ion source apparatus of surface ionization type comprises an emitter tip in the form of a round rod having a sharp-pointed end, an ion source material holder for holding the emitter tip coaxially within a crucible made of a material of a high melting point, the crucible having an opening formed in a bottom wall thereof through which the sharp-pointed end of the emitter tip extends outwardly, the ion source material is being filled in the crucible so as to enclose the outer periphery of the sharp-pointed end of the emitter tip, a filament for emitting electrons with which the emitter tip is bombarded from below, a heating power supply for the filament, an ion beam extracting electrode disposed between the emitter tip and the filament and maintained at a potential of a substantially the level as that of the filament, and an accelerating voltage power supply for applying a high voltage between the ion beam extracting electrode and the emitter tip to accelerate the electrons and ion beam.

REFERENCES:
patent: 2835835 (1958-05-01), Boutry et al.
patent: 3229157 (1966-01-01), Stevens et al.
patent: 3775630 (1973-11-01), Minamikawa et al.
patent: 3890535 (1975-06-01), Gautherin et al.
patent: 3928783 (1975-12-01), Hosoki et al.
patent: 4019077 (1977-04-01), Sakitani
patent: 4318029 (1982-03-01), Jergenson
patent: 4453078 (1984-06-01), Shimizu

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