[ital T][sub [ital e]] measurements in open- and closed-geometry long-scale-length laser plasmas via isoelectronic x-ray spectral line ratios

We have successfully employed isoelectronic line ratios to measure the electron temperature in gas-filled hohlraums and gas bags'' shot with the Nova laser. Isoelectronic line ratios are well suited to this measurement because they are relatively insensitive to radiation field effects (in...

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Bibliographic Details
Published in:Review of scientific instruments 1995-01, Vol.66:1
Main Authors: Shepard, T.D., Back, C.A., Kalantar, D.H., Kauffman, R.L., Keane, C.J., Klem, D.E., Lasinski, B.F., MacGowan, B.J., Powers, L.V., Suter, L.J., Turner, R.E., Failor, B.H., Hsing, W.W.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRON TEMPERATURE
LASER TARGETS
NOVA FACILITY
PLASMA DIAGNOSTICS
SPECTRA
TARGETS 700411 > Inertial Confinement Devices-- (1992-)
TRANSIENTS
X-RAY SPECTRA
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Summary:We have successfully employed isoelectronic line ratios to measure the electron temperature in gas-filled hohlraums and gas bags'' shot with the Nova laser. Isoelectronic line ratios are well suited to this measurement because they are relatively insensitive to radiation field effects (in hohlraums), opacity, transients, and variations in electron density compared to conventional line ratios. Targets were designed to produce plasma parameters [ital T][sub [ital e]][similar to]3 keV and [ital N][sub [ital e]][similar to]10[sup 21] cm[sup [minus]3] over a scale length of [similar to]2 mm. Collisional-radiative, transient [ital K]-shell atomic kinetics calculations including line transfer were performed by post-processing the Lasnex results. By comparing these calculations with experimental data, we infer electron temperatures of at least 3 keV for both types of targets.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1146278