Bias systems for resonance transformer million-volt electron beam generators

ELECTRON beam generating or X-ray equipment with the self-rectifying tube connected directly across the high-voltage resonance transformer1¿5 is a very reliable and economical type of high-voltage apparatus. The principal disadvantage of the spread of the electron energy during the useful half-cycle may be greatly reduced by the application of a periodically varying negative bias applied between a control electrode of the electron gun and the filament, so that current flow can take place only during the central portion of the half-wave of voltage.