Microwave Radiation of Nonrelativistic Electron Bunches Passing through Diaphragms

Experiments on generating electromagnetic pulses (EMPs) by using nonrelativistic electron bunches passing through diaphragms of various radii are described. Results obtained agree with the predictions of the transition radiation theory as applied to nonrelativistic charged particles passing through apertured conducting screens. They may also be used in designing devices for generating EMPs with tunable characteristics, as well as in developing a transition radiation theory for electrodynamic structures of complex geometries