Radiant energy – With charged particle beam deflection or focussing – Magnetic lens
Patent
1975-12-30
1977-01-11
LaRoche, Eugene R.
Radiant energy
With charged particle beam deflection or focussing
Magnetic lens
250307, 313361, 328228, H01J 3712
Patent
active
040029123
ABSTRACT:
A focusing lens for an ion beam having a gaussian or similar density profile is provided. The lens is constructed to provide an inner zero electrostatic field, and an outer electrostatic field such that ions entering this outer field are deflected by an amount that is a function of their distance from the edge of the inner field. The result is a beam that focuses to a uniform density in a manner analogous to that of an optical ring lens. In one embodiment, a conically-shaped network of fine wires is enclosed within a cylindrical anode. The wire net together with the anode produces a voltage field that re-directs the outer particles of the beam while the axial particles pass undeflected through a zero field inside the wire net. The result is a focused beam having a uniform intensity over a given target area and at a given distance from the lens.
REFERENCES:
patent: 2866902 (1958-12-01), Nygard
patent: 2952791 (1960-09-01), Wideroe
patent: 3100260 (1963-08-01), Wilska
patent: 3621327 (1971-11-01), Hashmi
patent: 3676693 (1972-07-01), Guernet
patent: 3937958 (1976-02-01), Rusch et al.
Carlson Dean E.
Deckelman Louis M.
LaRoche Eugene R.
The United States of America as represented by the United States
Zachry David S.
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