Application of a Nonharmonic Magnetic-Field Distribution for Focusing of Intense Electron Flows in Magnetic Periodic Focusing Systems

摘要

The results of theoretical and experimental investigation of focusing of intense extended electron flows in periodic magnetic fields with a nonsinusoidal distribution are presented. An easily realizable nonharmonic distribution that has three local maxima on the magnetic-field half-period and ensures small fluctuations of the boundary of an intense electron flow at high values of the field parameter is found. The results of application of magnetic periodic focusing systems (MPFSs) with the obtained distributions in pulsed traveling-wave tubes with a slow-wave structure integrated with the MPFS pole pieces are presented.