Thermoelectron generating source and ion beam radiating...

Details Thermoelectron generating source and ion beam radiating... Thermoelectron generating source and ion beam radiating...

2005-03-29

2005-03-29

Lee, John R. (Department: 2881)

Radiant energy

Irradiation of objects or material

Ion or electron beam irradiation

C250S492200, C250S492210

Reexamination Certificate

active

06872959

ABSTRACT:
A thermoelectron generating source including a facial main cathode for emitting thermoelectrons by being heated from behind, a filament for heating the main cathode from behind to emit the thermoelectrons, an extraction electrode for extracting the thermoelectrons emitted from the main cathode under an electric field, the extraction electrode being provided near the front of the main cathode, and two deflecting electrodes and disposed on the left and right sides near the front of the extraction electrode to carry the extraction electrode. The potentials of the two deflecting electrodes are kept in a relation VL>VR≧0, where the potential of one deflecting electrode is VLand the potential of the other deflecting electrode is VR.

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