Detailed Hydrodynamic and X-ray Spectroscopic Analysis of a Laser-Produced Rapidly-Expanding Aluminum Plasma.

Chambers, D. M. ; Glenzer, S. H. ; Hawreliak, J. ; Wolfrum, E. ; Gouveia, A.

Technical Information Center Oak Ridge Tennessee

关键词: Aluminum;    Hydrodynamic analysis;    X-ray spectroscopic analysis;    Laser plasma interactions;    Plasma pumping;   

RP-ID  :  DE200515013272

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We present a detailed analysis of K-shell emission from laser-produced rapidly expanding aluminum plasmas. This work forms part of a series of experiments performed at the Vulcan laser facility of the Rutherford Appleton Laboratory, UK. 1-D planar expansion was obtained by over-illuminating Al-microdot targets supported on CH plastic foils. The small size of the Al-plasma ensured high spatial and frequency resolution of the spectra, obtained with a single crystal spectrometer, two vertical dispersion variant double crystal spectrometers, and a vertical dispersion variant Johann Spectrometer. The hydrody2namic properties of the plasma were measured independently by spatially and temporally resolved Thomson scattering, utilizing a 4 probe beam. This enabled sub- and super- critical densities to be probed relative to the 1 heater beams. The deduced plasma hydrodynamic conditions are compared with those generated from the 1-D hydro-code Medusa, and the significant differences found in the electron temperature discussed. Synthetic spectra generated from the detailed term collisional radiative non-LTE atomic physics code Fly are compared with the experimental spectra for the measured hydrodynamic parameters, and for those taken from Medusa. Excellent agreement is only found for both the H- and He-like Al series when careful account is taken of the temporal evolution of the electron temperature.