13 September 2005 Soft x-ray laser interferometry of colliding plasmas
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Abstract
We have used soft x-ray laser interferometry to study dense colliding plasmas produced by laser irradiation of semi-cylindrical targets. Results are reported on the evolution of 1 mm long plasmas created by heating 500 μm diameter half holhraum copper targets with an intensity of ~1.6 1012 W.cm-2 from 120 ps duration laser pulses of 800 nm wavelength. The setup combines a robust high throughput amplitude division interferometer based on diffraction gratings with a 46.9 nm table-top capillary discharge laser. Series of high contrast interferograms were obtained depicting the evolution of the copper plasmas into a localized plasma that reaches densities above 1×1020 cm-3 when the plasmas collide near the center of the cavity. The technique allows the generation of high resolution density maps of colliding plasma with various degree of collisionality for comparison with code simulations.
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J. Grava, M. Purvis, J. Filevich, M. C. Marconi, J. J. Rocca, J. Dunn, S. J. Moon, R. F. Smith, J. Nilsen, V. N. Shlyaptsev, "Soft x-ray laser interferometry of colliding plasmas", Proc. SPIE 5919, Soft X-Ray Lasers and Applications VI, 59190I (13 September 2005); doi: 10.1117/12.617052; https://doi.org/10.1117/12.617052
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