Production of homogeneous fields

Abstract

The potential in a cylindrical arrangement of electrodes or coils is described by means of Fourier series of which the first harmonic supplies the homogeneous field. From the development the influence of higher harmonics can easily be seen. As an example this treatment is applied to the construction of two simple systems in which several higher harmonics are eliminated. To demonstrate this elimination both systems were used as deflectors in an electron-optical set-up.