Thomson scattering measurements of optically ionized plasmas produced by intense KrF radiation: the observation of high electron-to-ion temperature ratios

Justin S. Wark; Allen A. Offenberger; W. J. Blyth; Michael H. Key; S. G. Preston; Z. Najmudin; A. E. Dangor; A. Djaoui

doi:10.1117/12.168008

1 February 1994 Thomson scattering measurements of optically ionized plasmas produced by intense KrF radiation: the observation of high electron-to-ion temperature ratios

Justin S. Wark, Allen A. Offenberger, W. J. Blyth, Michael H. Key, S. G. Preston, Z. Najmudin, A. E. Dangor, A. Djaoui

Author Affiliations +

Proceedings Volume 2015, Applications of Laser Plasma Radiation; (1994) https://doi.org/10.1117/12.168008
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

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.

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Justin S. Wark, Allen A. Offenberger, W. J. Blyth, Michael H. Key, S. G. Preston, Z. Najmudin, A. E. Dangor, and A. Djaoui "Thomson scattering measurements of optically ionized plasmas produced by intense KrF radiation: the observation of high electron-to-ion temperature ratios", Proc. SPIE 2015, Applications of Laser Plasma Radiation, (1 February 1994); https://doi.org/10.1117/12.168008

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