Abstract
The computational methods of deflection fields in magnetic yokes with wedged coil-sections and electrostatic deflectors with planar electrodes are discussed. The magnetic yokes with wedged coil-sections can be combined into various shapes of magnetic deflectors, which may offer a variety of choices for adjusting the deflection field distributions to reduce the deflection aberrations more effectively. An advantage of the planar electrostatic deflectors is the simplicity in structure, which might allow the deflectors to be used in the deflection array of multi-electron beam lithography systems. Based on the methods described in this paper two computer programs have been developed. As examples, the deflection field distribution of some typical deflectors have been computed.
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