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Investigation of laser-matter interaction dynamics
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Type
Thesis
Author
Suresh Kumar M. Singaram
Supervisor
Lee, Sing
Abstract
A laser matter interaction facility was set up. Optical and x-ray diagnostics were developed and set up. Laser irradiance at the focal plane was increased to a sufficient level by reducing the spot size. The interaction of the laser with various target material was investigated by probing the plasma optically and by observing the emission of x-rays.
Shock wave velocities up to 107 cm/s were observed for targets in air using shadow and schlieren photography. Electron density measurements of 1019 cm-3 were made using interferometry. X-ray PIN diode measurements show x-ray yields of up to 5% of incident laser energy.
A computer aided schlieren technique was developed and the results obtained were found to be in consistent with experiment. Shock front displacements obtained from the experiments agreed with the results from Hyades, a 1D Lagrangian code. A simpler model was developed based on the snow plow model. The results also agree with the experiments.
Electron temperatures of 70eV was predicted by Hyades for intensities of 1.4 x 1012 W/cm2. However, at lower intensities 1010 W/cm2, a temperature of only 8eV was predicted. This prediction agrees with the observation of x-rays at 1.4 x 1012 W/cm2 in the experiments.
Shock wave velocities up to 107 cm/s were observed for targets in air using shadow and schlieren photography. Electron density measurements of 1019 cm-3 were made using interferometry. X-ray PIN diode measurements show x-ray yields of up to 5% of incident laser energy.
A computer aided schlieren technique was developed and the results obtained were found to be in consistent with experiment. Shock front displacements obtained from the experiments agreed with the results from Hyades, a 1D Lagrangian code. A simpler model was developed based on the snow plow model. The results also agree with the experiments.
Electron temperatures of 70eV was predicted by Hyades for intensities of 1.4 x 1012 W/cm2. However, at lower intensities 1010 W/cm2, a temperature of only 8eV was predicted. This prediction agrees with the observation of x-rays at 1.4 x 1012 W/cm2 in the experiments.
Date Issued
1996
Call Number
QC688 Sur
Date Submitted
1996