Method and apparatus for correcting chromatic aberration in char

Details Method and apparatus for correcting chromatic aberration in char Method and apparatus for correcting chromatic aberration in char

1987-02-17

1989-01-03

Anderson, Bruce C.

Radiant energy

Invisible radiant energy responsive electric signalling

Flow metering

250396ML, H01J 314, G21K 108

Patent

active

047959126

ABSTRACT:
A technique for compensating for chromatic aberration in particle beams, caused by differing particle energy levels when a beam is deflected for beam steering or beam focusing. A compensating deflection is applied to the beam upstream of its intended point of deflection. When the particles reach the point of deflection, the effect of the compensating deflection is proportional to the energy level of each particle, and compensates for the aberration that would normally occur. The point at which the compensating deflection is applied is selected to be one-fourth of a cycle in longitudinal phase space and an integral number of half-cycles in transverse phase space. With this critical spacing, the compensating deflection at the point of its application is proportional to relative phase in longitudinal phase space, but is proportional to energy level at the intended point of deflection.

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