Mikhail F. Kanevskii

Investigation of the dynamics of a laser-supported detonation wave using a self-consistent numerical model

Results are reported of a computational—theoretical analysis of the dynamics (propagation and decay) of laser-supported detonation waves (LSDW) in focused laser beams. The investigations were carried out using a self-consistent numerical model that takes account of the gasdynamic motion of the plasma and the refraction and absorption of the radiation in the plasma, with allowance for its real equation of state. An analysis is presented of the influence of the radial structure of the radiation on the propagation and decay of the LSDW, and of the conditions of the radiation transformation. Results on the dynamics of two-dimensional LSDW in the beam of an excimer laser are presented.

Multidimensional phenomena in laser-produced plasma

The paper reviews the results on excimer- and carbon-dioxide-laser-produced plasma studies. Laser supported detonation waves were studied both experimentally and theoretically. Good agreement was achieved between the results of the computer and real laboratory experiments. The dynamics of LSDW in the moving TEA carbon dioxide laser beam were investigated. The Raleigh-Taylor instability of the 20 nanosecond XeCl laser produced erosion plasma dynamics in the low pressure ambient gas was observed.

Structure, dynamics and optical properties of multicomponent plasma produced near a surface by pulsed CO2 and excimer lasers

Results of the experimental studies of dynamics and optical properties of laser-induced plasmas are presented. Lasers with microsecond pulse width at (lambda) equals 0.308 and 10.6 micrometers were used. Spatially and temporally resolved plasma emission spectroscopy and laser beam absorption measurements were used to reveal plasma plume structure. It has been shown that in the case of low absorption at the plasma front, a two component plasma is formed with gas plasma temperature above 3 eV and electron number density in both gas and target vapor plasma in the range 1018 - 3 (DOT) 1019 cm-3. Comparison of the experimental data with computer model predictions is presented.

Simulation of refraction and absorption of laser emission in a low-temperature plasma

The paper describes a self-consistent two-dimensional nonstationary model of the ineraction between a CO2-laser beam and a low-temperature surface plasma. Account is taken of gasdynamic and refraction processes, of laser-emission absorption, and of the real equation of state. Principal attention is paid to a description of a quick discrete vector algorithm for the solution of the geometric-optics equations. The propagation and decay of an optical-detonation wave in a focused laser beam is investigated for the first time with the aid of a self-consistent numerical model.