V. G. Korzh

Dielectric losses in diamond-like materials at the cryogenic temperatures in the millimeter waveband

The paper presents the study results of the temperature dependence of the dielectric loss at millimeter waves in the temperature range of 1.0 - 300 K in some low-absorbing dielectric and semiconductor materials having the diamond-like crystal lattices. It is shown that the absorption maxima at helium temperatures in materials with a centrosymmetric lattice are primary associated with both intrinsic and extrinsic losses, and in materials with a noncentrosymmetric lattice - with extrinsic losses. The relaxation times, activation energies and other parameters characterizing the Debye mechanism of extrinsic losses of the investigated materials are determined on the base of the approximation model of temperature dispersion of losses.

Installation for investigation of electron beams of vacuum electronic devices of millimeter-wave band

Output characteristics and parameters of electronic devices greatly depend on the properties of electron beams (EB) which transfer and transform the energy. In this case the information concerning exact space configuration and microstructure of the beam is of paramount importance and can be received only by use of experimental methods of diagnostics based on different physical phenomena. During the last years attention of investigators has been attracted by transient radiation which can be used effectively enough for diagnostics of EB.