Radiant energy – Ion generation – Field ionization type
Patent
1986-11-18
1988-10-11
Anderson, Bruce C.
Radiant energy
Ion generation
Field ionization type
250427, 31511131, H01J 3706
Patent
active
047773707
ABSTRACT:
The electron gun comprises an ionization chamber, adjacent to a high voltage chamber. In the wall common the both chambers provision is made for an extraction grid. On the opposite side, the ionization chamber comprises an outlet window for the electrons similar in shape to the extraction grid, and accompanied by a fine metallic foil. The high voltage chamber comprises a cathode brought to a high negative voltage. By giving the two grids the shape of similar parallel strips, a masking effect and a focusing effect are obtained at one and the same time which allows the efficiency of the electron gun to be increased.
REFERENCES:
patent: 3970892 (1976-07-01), Wakalopulos
patent: 4516848 (1985-05-01), Moriya
patent: 4642522 (1987-02-01), Harvey et al.
The Journal of Vacuum Science and Technology, vol. 12, No. 6, Nov./Dec. 1975, American Institute of Physics, New York, U.S.; D. Pigache et al.: "Secondary Emission Electron Gun for High Pressure Molecular Lasers".
Review of Scientific Instruments, vol. 46, No. 9, Sep. 1985, American Institute of Physics, New York, U.S., J. R. Baylass: "Plasma-Cathode Electron Gun".
Danel Francois
Pigache Daniel
Anderson Bruce C.
Guss Paul A.
Office National d'Etudes et de Recherche Aerospatiales (ONERA)
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