Investigation of Plasma Parameters at the Spherical Heating of the Isolated Solid Target by High-Power Laser Radiation

The results of the investigation of high-temperature non-stationary plasma produced at the spherical heating of the ball-shaped (CD2)n target by high-power irradiation of the 9-channel laser setup are reported. It had been found that the fraction of absorbed energy reached 70% of the incident radiation at flux densities ~ 1014 – 1015 W cm−2. About 10–25% of the energy absorbed in the target is reemitted in the X-ray spectral range, while the fraction of energy reflected from plasma was not greater than 10%. The study of gas-dynamic parameters of the hot plasma “corona” made it possible to measure the pressure in the dense plasma core. The pressure was about 106 – 107 atm at the flux density of about 1015 W cm−2. Experimental data on measuring density, velocity and pressure in the “corona” region made it possible to conclude about experimental realization of the compression value of the order of 30.