Synthetic plasma ion source

Radiant energy – Ion generation – Field ionization type

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250427, 31511181, H01J 2700

Patent

active

045490821

ABSTRACT:
An improved crossed-beam charge-exchange ion gun in which a synthetic plasma is formed by injecting an electron beam into a collimated molecular beam just before the molecules are ionized by charge exchange with a crossed primary ion beam, thereby forming a secondary ion beam from the ionized but space-charge-neutralized and substantially undeflected molecular beam. The plasma thus formed extends to an aperture stop in an aperture tube which extends upstream from an anode downstream of which anode a cathode is placed. A field is formed within the cathode/anode space and within the aperture tube into which the plasma extends. The sheath edge of the plasma within the tube is curved by the field to form a meniscus, and the aperture, being smaller in area than the secondary ion beam upstream of the aperture, both collimates the secondary ion beam and acts as a lens stop for the subsequent immersion lens formed by the meniscus and the field region.

REFERENCES:
patent: 3616596 (1971-11-01), Campargue
patent: 3846668 (1974-11-01), Ehlers et al.
patent: 3914655 (1975-10-01), Dreyfus et al.
patent: 4318028 (1982-03-01), Perel et al.
patent: 4475063 (1984-10-01), Aston
"High Intensity Supersonic Molecular Beam App.", Campargue, Rarified Gas Dynamics, Supp. 3, vol. II, 1966, Academic Press.
"Crossed-Molecular-Beam Study of the Kinematics and Dynamics of Charge-Transfer Collisions", Kaiser 51.41, Jour. of Chemical Phy., vol. 61, No. 7, Oct. 1974.
Q Machines, Motley, Academic Press, 1975.
Focusing of Charged Particles, Septier, "Production of Ion Beams of High Intensity", Academic Press 1967, pp. 123-149.
"Optimization of the Trochoidal Electron Monochromator", McMillan et al., Rev. of Sci. Inst., 51677, Jul. 1980.
"Ionic and Plasma Propulsion for Space Vehicles", Brewer et al., Proceeding of the IRE, vol. 49, #12, 1961.

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