Cherenkov and parametric (quasi-Cherenkov) radiation produced by a relativistic charged particle moving through a crystal built from metallic wires

Parametric radiation in THz frequency range, produced by relativistic charged particles moving through a crystal built from metallic wires is considered. Effective polarizabilities of the crystal are found. The radiation intensity is shown to be maximal at λ∼2πR, where R is the wire radius and λ is the radiation wavelength. The peak power of Cherenkov and parametric radiation produced by electron bunches in such a crystal at λ∼2πR are demonstrated to be high enough to enable experimental observation and practical applications.