Electron Beam Deflection: Part II. Applications of the Small-Angle Deflection Theory

Abstract

The theory developed in Part I is applied to a number of typical deflection fields such as the fields produced by parallel plates, parallel cylinders, semi-infinite co-planar sheets, and bent-plates. Graphs for the magnitude of deflection are given. An electrolytic tank potential-plotting device is described which was used for the determination of the potential distribution of some of the deflection fields. The theory shows that the deflection is a function of the initial conditions of the electron beam before entering the field and that it is a slightly non-linear function of the field strength. It follows that the fluorescent spot and the pattern produced on the screen of cathode-ray tubes will show distortions. These distortions were calculated for several deflection fields and electron beam shapes; the results are shown graphically. The problem of the reduction of these distortion effects is discussed.