Laser spark initiated microwave discharge

The process of laser-spark-assisted initiation of microwave (MW) discharge in the free space has been experimentally studied. It is established that a threshold for laser-spark-initiated MW discharge at atmospheric pressure decreases in a broad range of MW pulse delay times relative to the laser pulse. At a reduced air pressure, MW discharge can be laser-initiated in the absence of spark.     

Determining integral characteristics of a microwave streamer by using a scattered signal

The dynamics of the power-flux density scattered by a microwave streamer in air was studied experimentally near the breakdown threshold in the range of pressures from 10⁴ to 1.4 × 10⁴ Pa. Based on the measurement data, we estimated amplitudes of the total charge and current, as well as the effective scattering surface of the plasma dipole formed.     

Temperature field of an infinite plate with variable thermophysical characteristics

Nomograms are proposed to compute the temperature fields of simplest kind with a linear change in the thermophysical coefficients for boundary conditions of the third kind, which refine engineering computations of body heating.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol.18, No.1, pp.180–183, January, 1970.     

Effect of gasdynamic processes on structure and threshold of laser spark initiated microwave discharge

The process of the laser-spark-assisted initiation of microwave (MW) discharge in the free space in air has been experimentally studied. It is established that, at a preset MW field intensity, the maximum time for which the laser spark retains its initiating ability increases with the laser pulse energy. In the interval of air pressures of 150–750 Torr, a significant decrease in the MW discharge initiation threshold and the period of retained initiating ability of laser spark are determined by laser-spark-induced gasdynamic perturbations.     

Interaction of microwave radiation with an erosion plasma jet

The interaction of high-power pulsed microwave radiation with a plasma jet formed by a discharge in an ablative capillary is studied. A significant influence of microwave radiation on the plasma jet flow is found. Depending on the intensity of the initial perturbation of the jet, different scenarios of its evolution downstream are possible: attenuation or amplification accompanied with the development of turbulence up to the disruption of the flow if a certain threshold of the energy action is exceeded. A significant influence of the plasma jet and its state on the spatial position of the microwave energy release zone is found.