28 September 2009 Elucidating the collimation of laboratory plasma jets using soft x-ray interferometry
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Abstract
The mechanisms responsible for an increase in collimation of laboratory plasma jets with higher atomic number was studied using soft x-ray laser interferometry and 2D model simulations. Dense plasma jets (Ne~ 1020 cm-3) were produced by irradiating V-shaped grooves of different materials (C, Al, and Cu) with 120 ps Ti:Sa laser pulses at peak intensities of 1 x 1012 W cm-2. High contrast soft x-ray interferograms of these plasmas were generated by combining a Mach-Zehnder interferometer that uses diffraction gratings as beam-splitters and a 46.9 nm table-top capillary discharge laser probe. A significant increase in jet collimation was observed for the higher Z materials. Simulations performed with the radiation hydrodynamic code HYDRA attribute differences in jet collimation to an increased radiation cooling of the higher Z jets.
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M. A. Purvis, M. A. Purvis, J. Grava, J. Grava, J. Filevich, J. Filevich, D. P. Ryan, D. P. Ryan, S. J. Moon, S. J. Moon, J. Dunn, J. Dunn, V. N. Shlyaptsev, V. N. Shlyaptsev, J. J. Rocca, J. J. Rocca, } "Elucidating the collimation of laboratory plasma jets using soft x-ray interferometry", Proc. SPIE 7451, Soft X-Ray Lasers and Applications VIII, 74510L (28 September 2009); doi: 10.1117/12.826283; https://doi.org/10.1117/12.826283
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