Achromatic deflector and quadrupole lens

Details Achromatic deflector and quadrupole lens Achromatic deflector and quadrupole lens

1982-09-16

1986-05-20

Fields, Carolyn E.

Radiant energy

With charged particle beam deflection or focussing

Magnetic lens

250396ML, H01J 2958, H01J 2970

Patent

active

045903794

ABSTRACT:
The process of achromatic deflection by substantially uniform, crossed electric and magnetic fields with certain magnitudes. When the magnetic force is opposite to the electric force and twice as large, deflection is independent of particle velocity. An achromatic deflector produced by proper excitation of the poles of an achromatic quadrupole lens by means of suitable power supplies, without additional parts within the lens. An achromatic quadrupole lens having no yoke and only four electrodes, suitable for deflections varying at high frequency.

REFERENCES:
patent: 2919381 (1959-12-01), Glaser
patent: 3209147 (1965-09-01), Dupouy et al.
patent: 4335309 (1982-06-01), Anger et al.
patent: 4362945 (1982-12-01), Riecke
patent: 4464573 (1984-08-01), Dalglish
Szabo, "Paraxial Chromatic Aberration of Symmetrized Quadrupole Lenses", Nuc. Instru. and Methods, 106, 1973, pp. 61-64.
Kel'man, "Achromatic Quadrupole Electron Lenses", Soviet Physics-Tech. Phys., 6 (12), Jun. 1962, pp. 1052-1054.

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