Hydrogen hollow cathode ion source

Details Hydrogen hollow cathode ion source Hydrogen hollow cathode ion source

1978-10-23

1980-08-19

Segal, Robert

Electric lamp and discharge devices

With positive or negative ion acceleration

Supplying ionizable material

3132314, H01J 1726

Patent

active

042186331

ABSTRACT:
A source of hydrogen ions is disclosed and includes a chamber having at one end a cathode which provides electrons and through which hydrogen gas flows into the chamber. Screen and accelerator grids are provided at the other end of the chamber. A baffle plate is disposed between the cathode and the grids and a cylindrical baffle is disposed coaxially with the cathode at the one end of the chamber. The cylindrical baffle is of greater diameter than the baffle plate to provide discharge impedance and also to protect the cathode from ion flux. An anode electrode draws the electrons away from the cathode.
The hollow cathode includes a tubular insert of tungsten impregnated with a low work function material to provide ample electrons. A heater is provided around the hollow cathode to initiate electron emission from the low work function material.

REFERENCES:
patent: 3113427 (1963-12-01), Meyer
patent: 3238715 (1966-03-01), Reader et al.
patent: 3345820 (1967-10-01), Masek
patent: 3728861 (1973-04-01), Pawlik et al.

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