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Analysis and comparison of x-ray image and x-ray burst features of high intensity laser beam jets interaction experiments on the leopard laser at UNR

Results of Ar gas-puff experiments performed on the high power Leopard laser at UNR are presented. The Leopard laser operated in two regimes: 350 fs, 40 TW pulse, or 0.8 ns, 25 GW pulse (pulse contrast from 10 -5 to 10 -7 ). Laser wavelength was 1.057 μm. The supersonic linear nozzle was compared wi...

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Bibliographic Details
Main Authors: Schultz, K. A., Kantsyrev, V. L., Safronova, A. S., Moschella, J. J., Shlyaptseva, V. V., Weller, M. E., Petkov, E. E., Shrestha, I. K., Stafford, A., Cooper, M. C.
Format: Conference Proceeding
Language:English
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Summary:Results of Ar gas-puff experiments performed on the high power Leopard laser at UNR are presented. The Leopard laser operated in two regimes: 350 fs, 40 TW pulse, or 0.8 ns, 25 GW pulse (pulse contrast from 10 -5 to 10 -7 ). Laser wavelength was 1.057 μm. The supersonic linear nozzle was compared with cylindrical tube sub-sonic nozzle. Flux density of laser radiation in focal spot was from 3×10 16 W/cm 2 (ns piulse) up to 2×10 19 W/cm 2 (fs pulse). The laser beam axis was positioned either along the jet plane or orthogonal to it at a distance of 1 mm from the nozzle output. Diagnostics included two sets of filtered Si-diodes (covered region from 1 to 55 keV), x-ray pinhole cameras, x-ray spectrometers, and Faraday cups. Specifically, x-ray images and structure of x-ray bursts are investigated and compared as a function of the orientation of the laser beam to the linear or cylindrical gas jet and laser pulse duration. The importance of analysis and comparison of x-ray image and x-ray burst features for a better understanding the mechanisms of the laser energy to x-ray conversion efficiency and future research directions are discussed.
ISSN:0730-9244
2576-7208
DOI:10.1109/PLASMA.2014.7012458