Radiant energy – Ion generation – Electron bombardment type
Patent
1982-08-06
1984-12-04
Anderson, Bruce C.
Radiant energy
Ion generation
Electron bombardment type
250423R, 376129, H01J 2700
Patent
active
044866658
ABSTRACT:
An ionization vessel is divided into an ionizing zone and an extraction zone by a magnetic filter. The magnetic filter prevents high-energy electrons from crossing from the ionizing zone to the extraction zone. A small positive voltage impressed on a plasma grid, located adjacent an extraction grid, positively biases the plasma in the extraction zone to thereby prevent positive ions from migrating from the ionizing zone to the extraction zone. Low-energy electrons, which would ordinarily be dragged by the positive ions into the extraction zone, are thereby prevented from being present in the extraction zone and being extracted along with negative ions by the extraction grid. Additional electrons are suppressed from the output flux using ExB drift provided by permanent magnets and the extractor grid electrical field.
REFERENCES:
patent: 4140943 (1979-02-01), Ehlers
patent: 4233537 (1980-11-01), Limpaecher
patent: 4329586 (1982-05-01), Dagenhart et al.
patent: 4377773 (1983-03-01), Hershcovitch et al.
LBL-14292, "Volume-Produced H.sup.- Multicusp Source", Leung et al., 8-6-82, pp. 1-23.
LBL-14292 Abstract, "H.sup.- Ion Production and Electron Suppression in a Magnetically-filtered Multicusp Source", Leung et al., Jul. 19, 1982.
"Self Extraction Negative Ion Source", Leung et al., Rev. of Sci. Inst., 53 (6), Jun. 1982, pp. 30-36.
"Multicusp Negative Ion Source", Rev. of Sci. Inst., Ehlers et al., 51 (6), Jun. 1980, pp. 721-727.
"Electron Suppression in a Multicusp Negative Ion Source" Appl. Phys. Lett., 38 (4) Ehlers et al., Feb. 1981, pp. 287-289.
"H.sup.- Ion Formation from a Surface Conversion Type Ion Source", Leung et al., J. Appl. Phys., 52 (6), Jun. 1981, pp. 3905-3911.
Ehlers Kenneth W.
Leung Ka-Ngo
Anderson Bruce C.
Carnahan L. E.
Esposito Michael F.
Gaither Roger S.
The United States of America as represented by The United States
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