. The Bell System technical journal . widerangles with the axis than the small inclination of the lines of force. Space Charge Limitations In electron beam devices using reasonably large currents, the spacecharge of the electrons is a very serious source of trouble both in compli-cating design of the devices and in limiting their performance. Let us begin our consideration right at the electron gun, the source ofelectron flow in many devices such as cathode ray tubes and certain high-frequency tubes. Electron guns are sometimes designed on the basis ofradial space charge limited electron flow
. The Bell System technical journal . widerangles with the axis than the small inclination of the lines of force. Space Charge Limitations In electron beam devices using reasonably large currents, the spacecharge of the electrons is a very serious source of trouble both in compli-cating design of the devices and in limiting their performance. Let us begin our consideration right at the electron gun, the source ofelectron flow in many devices such as cathode ray tubes and certain high-frequency tubes. Electron guns are sometimes designed on the basis ofradial space charge limited electron flow between a cathode in the form of aspherical cap of radius fo and a concentric spherical anode a distance d fromthe cathode. It can be shown that by use of suitable electrodes external tothe beam, radial motion can be maintained between cathode and anode along 314 BELL SYSTEM TECHNICAL JOURNAL Straight lines normal to the cathode surface. A hole in the anode electrodewill allow the beam to emerge from the gun. Because of the change in. Fig. 7—Electron gun utilizing rectilinear flow.
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