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Proceedings Paper

Soft x-ray laser interferometry/shadowgraphy of exploding wire plasmas
Author(s): Eric C. Hammarsten; Elzbieta Jankowska; Benito Szapiro; Jorge Filevich; Mario C. Marconi; Jorge J. Rocca
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Paper Abstract

We present results from soft x-ray laser interferometry/shadowgraphy of current-driven thin wire plasmas using a capillary discharge pumped 46.9 nm laser and a diffraction grating interferometer. We have obtained series of soft x-ray images of exploding Al wires 15 μm or 25 μm in diameter. The high photo-ionization cross sections of atoms and low charge ions at this wavelength allow the soft x-ray laser probe to detect the early stages of formation of a coronal plasma surrounding the wire core. Wires of 25 μm diameter excited by current pulses with a 78 A/ns increase rate are observed to expand uniformly. However, an increase in the rate of energy deposited per unit of mass is observed to give rise to significant instabilities. The simultaneous analysis of the fringe shift and soft x-ray absorption data suggests the coronal plasma contains a significant concentration of low Z impurities. The results illustrate that table-top soft x-ray lasers are a powerful new tool for the diagnostics of dense plasmas.

Paper Details

Date Published: 19 December 2003
PDF: 10 pages
Proc. SPIE 5197, Soft X-Ray Lasers and Applications V, (19 December 2003); doi: 10.1117/12.507222
Show Author Affiliations
Eric C. Hammarsten, Colorado State Univ. (United States)
Elzbieta Jankowska, Colorado State Univ. (United States)
Wroclaw Univ. of Technology (Poland)
Benito Szapiro, Univ. of the South Sewanee (United States)
Jorge Filevich, Colorado State Univ. (United States)
Mario C. Marconi, Colorado State Univ. (United States)
Univ. de Buenos Aires (Argentina)
Jorge J. Rocca, Colorado State Univ. (United States)

Published in SPIE Proceedings Vol. 5197:
Soft X-Ray Lasers and Applications V
Ernst E. Fill; Szymon Suckewer, Editor(s)

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