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US 4,121,128 AGranted
Collective ion accelerator with foil-less beam extraction window
AssigneeThe United States of America as represented by the Secretary of the Army
InventorThomas G. Roberts
Life of this patent
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Abstract
Ions are generated in a vacuum condition of an ion accelerator and injected hrough three aerodynamic windows to atmosphere pressure. In its travel through the windows the coil provides a magnetic field to prevent the ion beam from dissipating while it is traveling to the atmosphere.
Claims5
In an ion beam generating system including an evacuated ion accelerator and an ion extraction window spaced downstream therefrom, the improvement comprising:
- (a) means for generating electrons for flow through said accelerator;
- (b) means for injecting ions into said electron flow in said ion accelerator;
- (c) means for connecting said accelerator to said ion extraction window;
- and
- (d) a plurality of aerodynamic windows disposed in serial spaced relation along said connecting means, each said aerodynamic window being disposed for decreasing the pressure in said connecting means in a predetermined stepped relation.
2 more elements
Dependencies are inferred from the claim text.