Radiant energy – Ionic separation or analysis – With sample supply means
Patent
1996-03-20
1997-07-01
Nguyen, Kiet T.
Radiant energy
Ionic separation or analysis
With sample supply means
250423R, H01J 4904
Patent
active
056441304
ABSTRACT:
An ion source employs a self-contained sample containment valve which serves to store, transport and dispense a gas sample from which a negative ion beam is generated. The valve is loaded with a sample of carbon dioxide gas by cryo-pumping carbon dioxide gas into a finger which is refrigerated with liquid nitrogen and which is connected to the stored volume of the valve. A sample contained in the gas containment valve is combined with a total of forty sample containment valves on a carousel which is mounted adjacent to the cathode of a negative ion source of a tandem accelerator facility within a vacuum chamber. When a particular sample containment valve is aligned with the cathode an actuator causes the sample containment valve to move forward a short distance positioning the valve to dispense gas to generate a negative carbon ion beam. When changing the samples contained on the carousel, the ion source must be shut off from the vacuum chamber. This is accomplished by interposing a gate valve. In order to minimize the distance which the sample containment valves must move to enter into engagement with the ion source, the entire sample vacuum chamber and drive mechanism is slidably mounted with respect to the ion source. A stainless steel bellows allows the retracting motion of the sample vacuum chamber. The gate valve provides passage for the ion source to enter or leave the sample vacuum chamber.
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National Electrostatics Corp.
Nguyen Kiet T.
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