Frequency-angle characteristics of superradiance pulses generated by ultrarelativistic electron bunches propagating in an undulator field

Terahertz superradiance (SR) from ultrarelativistic electron bunches propagating in an undulator field has been theoretically described using the averaged ponderomotive force method. In addition to the energy characteristics of SR pulses, the formation of a directivity pattern and the dependence of the spectral density of radiation on the angle of observation have been studied.