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Proceedings Paper

Thomson scattering measurements of optically ionized plasmas produced by intense KrF radiation: the observation of high electron-to-ion temperature ratios
Author(s): Justin S. Wark; Allen A. Offenberger; W. J. Blyth; Michael H. Key; S. G. Preston; Z. Najmudin; A. E. Dangor; A. Djaoui
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Paper Abstract

We report results of Thomson scattering measurements of optically ionized gases produced using 12 psec pulses from a KrF-pumped Raman laser at intensities of 3 X 1017 W cm-2. Electron densities and temperatures are determined from the scattered Thomson spectra in both He and Ne (static and gas jet targets) at pressures of 10-3 - 1 bar. The central, low frequency region of the spectra from low pressure shots clearly shows an enhanced intensity above that given by the Salpeter approximation, and is indicative of a high electron-to-ion temperature ratios of at least 10 - 20. These observations are consistent with the long electron-ion collision time relative to the pulse length.

Paper Details

Date Published: 1 February 1994
PDF: 7 pages
Proc. SPIE 2015, Applications of Laser Plasma Radiation, (1 February 1994); doi: 10.1117/12.168008
Show Author Affiliations
Justin S. Wark, Univ. of Oxford (United Kingdom)
Allen A. Offenberger, Univ. of Oxford (United Kingdom)
W. J. Blyth, Univ. of Oxford (United Kingdom)
Michael H. Key, Univ. of Oxford (United Kingdom)
S. G. Preston, Univ. of Oxford (United Kingdom)
Z. Najmudin, Imperial College of Science, Technology and Medicine (United Kingdom)
A. E. Dangor, Imperial College of Science, Technology and Medicine (United Kingdom)
A. Djaoui, SERC Rutherford Appleton Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 2015:
Applications of Laser Plasma Radiation
Martin C. Richardson, Editor(s)

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