L. Wang et al., STUDY OF SPACE-CHARGE DEVICES FOR FOCUSED ION-BEAM SYSTEMS, Journal of vacuum science & technology. B, Microelectronics and nanometer structures processing, measurement and phenomena, 13(6), 1995, pp. 2414-2418
Axisymmetric and nonaxisymmetric electron space-charge lenses and sphe
rical aberration correctors are studied theoretically. Many interestin
g features of the space-charge devices are revealed by considering som
e simple, but physically reasonable models. It is shown that a number
of simple space-charge distributions can compensate for a large range
of positive spherical aberrations. Several numerical examples are pres
ented in some detail. (C) 1995 American Vacuum Society.