Mathematics – Probability
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9310739w&link_type=abstract
Unknown
Mathematics
Probability
Irradiance, Laser Beams, Laser Outputs, Nova Laser System, Plasma Diagnostics, Algorithms, Harmonics, Inertial Confinement Fusion, Laser Fusion, Laser Targets, Photographic Measurement
Scientific paper
The scope of this report is two-fold. The first objective is to provide useful laser drive data for target physicists. One way to do this is to analyze the beam in detail at all of the sampled planes, assemble the results in an organized fashion and let the experiments pick out the beam parameters that apply to their particular experiments. This approach has advantages in that it fully documents the experiment and provides the individual details of the beam at various planes that may in fact be needed for some experiments. Therefore, a data book has been compiled as a companion document to this report. The data book contains analysis output for the laser irradiance in the 20 focal planes photographed. The analysis consists of irradiance line scans, plots of radially-averaged irradiance, integrated irradiance (power) versus radius, and irradiance probability density and distribution functions. A 16-level grey-scale beam image with overlaid contour plot is provided. A parallel analysis of the Fourier spectrum of the irradiance at each plane is compiled in the second half of the data book. The second objective of this report is to sort out the principle beam characteristics from the details and to relate this information to laser design and performance. The means by which this is accomplished is through the development of a Nova beam model which is tweaked in a controlled fashion until it closely approximates major aspects of the data. The model indicates that much of the beam behavior in the region of focus is due to only a few aberrations. Analysis of the model at best focus and planes up to 1.5 mm on either side of focus show good agreement with the data. The beam model should also prove useful to target-experiment modelers who are interested in simulating the laser irradiance throughout the focal region.
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